Hướng dẫn python how to capture print output - python làm thế nào để nắm bắt đầu ra in

Cũng dựa trên các câu trả lời của @Kindall và @ForeveWintr, đây là một lớp hoàn thành điều này. Sự khác biệt chính so với các câu trả lời trước đây là điều này nắm bắt nó như một chuỗi, không phải là một đối tượng StringIO, thuận tiện hơn nhiều để làm việc!

import io
from collections import UserString
from contextlib import redirect_stdout

class capture(UserString, str, redirect_stdout):
    '''
    Captures stdout (e.g., from ``print()``) as a variable.

    Based on ``contextlib.redirect_stdout``, but saves the user the trouble of
    defining and reading from an IO stream. Useful for testing the output of functions
    that are supposed to print certain output.
    '''

    def __init__(self, seq='', *args, **kwargs):
        self._io = io.StringIO()
        UserString.__init__(self, seq=seq, *args, **kwargs)
        redirect_stdout.__init__(self, self._io)
        return

    def __enter__(self, *args, **kwargs):
        redirect_stdout.__enter__(self, *args, **kwargs)
        return self

    def __exit__(self, *args, **kwargs):
        self.data += self._io.getvalue()
        redirect_stdout.__exit__(self, *args, **kwargs)
        return

    def start(self):
        self.__enter__()
        return self

    def stop(self):
        self.__exit__(None, None, None)
        return

Examples:

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

Điều này được thực hiện trong Sciris là sc.capture ().

Hàm python print () in thông báo lên màn hình hoặc bất kỳ thiết bị đầu ra tiêu chuẩn nào khác.prints the message to the screen or any other standard output device.

Syntax: 

print(value(s), sep= ' ', end = '\n', file=file, flush=flush)

Parameters:  

• Giá trị (s): Bất kỳ giá trị nào, và bao nhiêu tùy thích. Sẽ được chuyển đổi thành chuỗi trước khi inAny value, and as many as you like. Will be converted to string before printed
• SEP = Voi phân tách, (tùy chọn) Chỉ định cách tách các đối tượng, nếu có nhiều hơn một.default: Hồi ‘(Optional) Specify how to separate the objects, if there is more than one.Default :’ ‘
• end = kết thúc(Optional) Specify what to print at the end.Default : ‘\n’
• Tệp: (Tùy chọn) Một đối tượng có phương thức ghi. Mặc định: sys.stdout(Optional) An object with a write method. Default :sys.stdout
• Flush: (Tùy chọn) Một boolean, chỉ định nếu đầu ra được xả (đúng) hoặc đệm (sai). Mặc định: Sai(Optional) A Boolean, specifying if the output is flushed (True) or buffered (False). Default: False

Loại trả về: Nó trả lại đầu ra cho màn hình.It returns output to the screen.

Mặc dù không cần thiết phải truyền các đối số trong hàm in (), nhưng nó yêu cầu một dấu ngoặc đơn trống ở cuối để bảo Python thực thi chức năng thay vì gọi nó theo tên. Bây giờ, hãy để khám phá các đối số tùy chọn có thể được sử dụng với hàm in ().

Chuỗi chữ

Chuỗi chữ trong câu lệnh in Python, chủ yếu được sử dụng để định dạng hoặc thiết kế cách một chuỗi cụ thể xuất hiện khi được in bằng hàm in ().

• \ n: Chuỗi này theo nghĩa đen này được sử dụng để thêm một dòng trống mới trong khi in câu lệnh. This string literal is used to add a new blank line while printing a statement.
• Một số người khác: Một trích dẫn trống (Hồi) được sử dụng để in một dòng trống. An empty quote (“”) is used to print an empty line.

Example:

Python3

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

Output:

GeeksforGeeks 
 is best for DSA Content.

kết thúc = tuyên bố

Từ khóa kết thúc được sử dụng để chỉ định nội dung sẽ được in ở cuối hàm thực thi in (). Theo mặc định, nó được đặt thành Hồi \ n, dẫn đến việc thay đổi dòng sau khi thực hiện câu lệnh in ().

Ví dụ: python print () không có dòng mớiPython print() without new line

Python3

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

print(value(s), sep= ' ', end = '\n', file=file, flush=flush)

print(value(s), sep= ' ', end = '\n', file=file, flush=flush)

print(value(s), sep= ' ', end = '\n', file=file, flush=flush)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

print(value(s), sep= ' ', end = '\n', file=file, flush=flush)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

Output:

GeeksForGeeks is the best platform for DSA content
GeeksForGeeks is the best platform for DSA content**Welcome to GFG

Tranh cãi tuôn ra

I/OS trong Python thường được đệm, có nghĩa là chúng được sử dụng trong các khối. Đây là nơi Flush xuất hiện vì nó giúp người dùng quyết định xem họ có cần nội dung bằng văn bản hay không. Theo mặc định, nó được đặt thành sai. Nếu nó được đặt thành True, đầu ra sẽ được viết dưới dạng một chuỗi các ký tự hết lần này đến lần khác. Quá trình này chậm đơn giản vì nó dễ dàng viết bằng các khối hơn là viết một nhân vật tại một thời điểm. Để hiểu trường hợp sử dụng của đối số tuôn ra trong hàm in (), hãy để lấy một ví dụ.

Example:

Hãy tưởng tượng bạn đang xây dựng một bộ đếm thời gian đếm ngược, nối thời gian còn lại cho cùng một dòng mỗi giây. Nó sẽ trông giống như dưới đây:

3>>>2>>>1>>>Start

Mã ban đầu cho điều này sẽ trông giống như dưới đây;

Python3

print(value(s), sep= ' ', end = '\n', file=file, flush=flush)

GeeksforGeeks 
 is best for DSA Content.

GeeksforGeeks 
 is best for DSA Content.

print(value(s), sep= ' ', end = '\n', file=file, flush=flush)

GeeksforGeeks 
 is best for DSA Content.

GeeksforGeeks 
 is best for DSA Content.

GeeksforGeeks 
 is best for DSA Content.

GeeksforGeeks 
 is best for DSA Content.

GeeksforGeeks 
 is best for DSA Content.

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

GeeksforGeeks 
 is best for DSA Content.

GeeksForGeeks is the best platform for DSA content
GeeksForGeeks is the best platform for DSA content**Welcome to GFG

GeeksForGeeks is the best platform for DSA content
GeeksForGeeks is the best platform for DSA content**Welcome to GFG

GeeksForGeeks is the best platform for DSA content
GeeksForGeeks is the best platform for DSA content**Welcome to GFG

GeeksForGeeks is the best platform for DSA content
GeeksForGeeks is the best platform for DSA content**Welcome to GFG

GeeksForGeeks is the best platform for DSA content
GeeksForGeeks is the best platform for DSA content**Welcome to GFG

GeeksForGeeks is the best platform for DSA content
GeeksForGeeks is the best platform for DSA content**Welcome to GFG

GeeksForGeeks is the best platform for DSA content
GeeksForGeeks is the best platform for DSA content**Welcome to GFG

GeeksForGeeks is the best platform for DSA content
GeeksForGeeks is the best platform for DSA content**Welcome to GFG

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

3>>>2>>>1>>>Start

print(value(s), sep= ' ', end = '\n', file=file, flush=flush)

3>>>2>>>1>>>Start

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

GeeksForGeeks is the best platform for DSA content
GeeksForGeeks is the best platform for DSA content**Welcome to GFG

3>>>2>>>1>>>Start

GeeksForGeeks is the best platform for DSA content
GeeksForGeeks is the best platform for DSA content**Welcome to GFG

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

GeeksForGeeks is the best platform for DSA content
GeeksForGeeks is the best platform for DSA content**Welcome to GFG

12-12-2022

GeeksForGeeks is the best platform for DSA content
GeeksForGeeks is the best platform for DSA content**Welcome to GFG

GeeksForGeeks is the best platform for DSA content
GeeksForGeeks is the best platform for DSA content**Welcome to GFG

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

12-12-2022

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

Vì vậy, mã ở trên thêm văn bản mà không có dòng mới và sau đó ngủ trong một giây sau mỗi lần bổ sung văn bản. Khi kết thúc đếm ngược, nó in bắt đầu và chấm dứt dòng. Nếu bạn chạy mã như nó là, nó chờ 3 giây và đột ngột in toàn bộ văn bản cùng một lúc. Đây là một sự lãng phí 3 giây gây ra do bộ đệm của đoạn văn bản như hình dưới đây:

Mặc dù bộ đệm phục vụ một mục đích, nó có thể dẫn đến các hiệu ứng không mong muốn như hình trên. Để chống lại cùng một vấn đề, đối số Flush được sử dụng với hàm in (). Bây giờ, đặt đối số Flush là đúng và một lần nữa xem kết quả.

Python3

print(value(s), sep= ' ', end = '\n', file=file, flush=flush)

GeeksforGeeks 
 is best for DSA Content.

GeeksforGeeks 
 is best for DSA Content.

print(value(s), sep= ' ', end = '\n', file=file, flush=flush)

GeeksforGeeks 
 is best for DSA Content.

GeeksforGeeks 
 is best for DSA Content.

GeeksforGeeks 
 is best for DSA Content.

GeeksforGeeks 
 is best for DSA Content.

GeeksforGeeks 
 is best for DSA Content.

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

GeeksforGeeks 
 is best for DSA Content.

GeeksForGeeks is the best platform for DSA content
GeeksForGeeks is the best platform for DSA content**Welcome to GFG

GeeksForGeeks is the best platform for DSA content
GeeksForGeeks is the best platform for DSA content**Welcome to GFG

GeeksForGeeks is the best platform for DSA content
GeeksForGeeks is the best platform for DSA content**Welcome to GFG

GeeksForGeeks is the best platform for DSA content
GeeksForGeeks is the best platform for DSA content**Welcome to GFG

GeeksForGeeks is the best platform for DSA content
GeeksForGeeks is the best platform for DSA content**Welcome to GFG

GeeksForGeeks is the best platform for DSA content
GeeksForGeeks is the best platform for DSA content**Welcome to GFG

GeeksForGeeks is the best platform for DSA content
GeeksForGeeks is the best platform for DSA content**Welcome to GFG

Các

GeeksForGeeks is the best platform for DSA content
GeeksForGeeks is the best platform for DSA content**Welcome to GFG

3>>>2>>>1>>>Start

GeeksForGeeks is the best platform for DSA content
GeeksForGeeks is the best platform for DSA content**Welcome to GFG

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

GeeksForGeeks is the best platform for DSA content
GeeksForGeeks is the best platform for DSA content**Welcome to GFG

12-12-2022

GeeksForGeeks is the best platform for DSA content
GeeksForGeeks is the best platform for DSA content**Welcome to GFG

GeeksForGeeks is the best platform for DSA content
GeeksForGeeks is the best platform for DSA content**Welcome to GFG

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

12-12-2022

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

Output:

https://media.geeksforgeeks.org/wp-content/uploads/20201222163647/Untitled26---Jupyter-Notebook---Google-Chrome-2020-12-22-16-33-02.mp4

Máy tách biệt

Hàm in () có thể chấp nhận bất kỳ số lượng đối số vị trí. Để phân tách các đối số vị trí này, đối số từ khóa SEP SEP được sử dụng.

Lưu ý: Như SEP, End, Flush, Tệp là đối số từ khóa, vị trí của họ không thay đổi kết quả của mã.

Example:

Python3

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

print(value(s), sep= ' ', end = '\n', file=file, flush=flush)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

print(value(s), sep= ' ', end = '\n', file=file, flush=flush)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

print(value(s), sep= ' ', end = '\n', file=file, flush=flush)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

print(value(s), sep= ' ', end = '\n', file=file, flush=flush)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

Output:

12-12-2022

đối số tập tin

Trái với niềm tin phổ biến, hàm in () không chuyển đổi các tin nhắn thành văn bản trên màn hình. Chúng được thực hiện bởi các lớp mã cấp thấp hơn, có thể đọc dữ liệu (tin nhắn) bằng byte. Hàm print () là một giao diện trên các lớp này, giao cho việc in thực tế vào một luồng hoặc đối tượng giống như tệp. Theo mặc định, hàm in () được liên kết với sys.stdout thông qua đối số tệp. & Nbsp;file-like object. By default, the print() function is bound to sys.stdout through the file argument. 

Ví dụ: python print () vào tệp

Python3

print(value(s), sep= ' ', end = '\n', file=file, flush=flush)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

print(value(s), sep= ' ', end = '\n', file=file, flush=flush)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

____10

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

Output:

'Hello Geeks!!\n'

Ví dụ: Sử dụng hàm in () trong Python Using print() function in Python

Python3

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

print(value(s), sep= ' ', end = '\n', file=file, flush=flush)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

print(value(s), sep= ' ', end = '\n', file=file, flush=flush)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

print(value(s), sep= ' ', end = '\n', file=file, flush=flush)

print(value(s), sep= ' ', end = '\n', file=file, flush=flush)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

# Using with...as
with capture() as txt1:
    print('Assign these lines')
    print('to a variable')

# Using start()...stop()
txt2 = capture().start()
print('This works')
print('the same way')
txt2.stop()

print('Saved in txt1:')
print(txt1)
print('Saved in txt2:')
print(txt2)

Output:

GeeksForGeeks
x = 5
GFG
Python@GeeksforGeeks

Làm thế nào để bạn nắm bắt đầu ra tiêu chuẩn trong Python?

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Làm thế nào để bạn ghi lại đầu ra stdout từ một cuộc gọi chức năng Python?