Mở tệp ở chế độ nối thêm
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow6 và ghi vào tệp bằng phương thức
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow7. Bên trong phương thức
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow7, một chuỗi
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow9 được truyền. Văn bản này được nhìn thấy trên tệp như hình trên
Nếu bạn muốn tìm hiểu thêm về các loại chế độ mở tệp khác nhau, vui lòng tham khảo I/O tệp Python
Trong khi đọc hoặc ghi vào tệp, chế độ truy cập sẽ chi phối loại thao tác có thể thực hiện trong tệp đã mở. Nó đề cập đến cách tệp sẽ được sử dụng sau khi được mở. Các chế độ này cũng xác định vị trí của Xử lý tệp trong tệp. Định nghĩa của các chế độ truy cập này như sau
- Chỉ nối thêm ['a']. Mở tệp để ghi
- Nối và Đọc ['a+']. Mở tệp để đọc và ghi
Khi tệp được mở ở chế độ nối thêm trong Python, tay cầm được đặt ở cuối tệp. Dữ liệu được ghi sẽ được chèn vào cuối, sau dữ liệu hiện có.
ví dụ 1. Chương trình Python để minh họa chế độ Nối và ghi
Python3
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow0_______51
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow2____53
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow4
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow5
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow6
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow0
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow1
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow1
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow3
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow4
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow5
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow6
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow5
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow8
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow9
Hello This is Delhi This is Paris This is London Today0
Hello This is Delhi This is Paris This is London Today1
Hello This is Delhi This is Paris This is London Today2
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow0_______51
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow2____53
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow4
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow5
Hello This is Delhi This is Paris This is London Today9
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow00
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow01
________ 502 ________ 503 ________ 00
Hello This is Delhi This is Paris This is London Today1
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow0_______51
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow2____53
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow4
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow5
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow12
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow0
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow14
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow3____516
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow0
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow14
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow19
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow14
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow21
Hello This is Delhi This is Paris This is London Today1
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow23
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow0_______51
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow2____53
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow4
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow5
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow6
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow00
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow32
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow02
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow34
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow0
Hello This is Delhi This is Paris This is London Today1
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow0_______51
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow2____53
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow4
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow5
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow12
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow0
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow14
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow3____547
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow0
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow14
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow19
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow14
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow21
Hello This is Delhi This is Paris This is London Today1
đầu ra
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow1
ví dụ 2. Nối dữ liệu từ một dòng mới
Trong ví dụ xử lý tệp ở trên, có thể thấy rằng dữ liệu không được thêm vào từ dòng mới. Điều này có thể được thực hiện bằng cách ghi ký tự '\n' xuống dòng vào tệp.
Python3
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow54
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow55
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow0_______51
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow2____53
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow4
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow5
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow6
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow0
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow1
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow1
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow3
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow4
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow5
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow6
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow5
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow8
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow9
Hello This is Delhi This is Paris This is London Today0
Hello This is Delhi This is Paris This is London Today1
Hello This is Delhi This is Paris This is London Today2
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow01
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow0_______51
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow2____53
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow4
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow5
Hello This is Delhi This is Paris This is London Today9
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow0
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow15
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow02
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow17
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow0
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow02
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow20
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow0
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow22
________ 502 ________ 024 ________ 00
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow0_______51
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow2____53
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow4
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow5
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow12
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow0
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow14
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow3____516
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow0
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow14
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow19
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow14
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow21
Hello This is Delhi This is Paris This is London Today1
đầu ra
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow
Ghi chú. '\ n' được coi là một ký tự đặc biệt gồm hai byte
ví dụ 3. Sử dụng câu lệnh With trong Python
với câu lệnh được sử dụng trong xử lý ngoại lệ để làm cho mã sạch hơn và dễ đọc hơn nhiều. Nó đơn giản hóa việc quản lý các tài nguyên phổ biến như luồng tệp. Không giống như các triển khai ở trên, không cần gọi tệp. close[] khi sử dụng với câu lệnh. Bản thân câu lệnh with đảm bảo việc thu thập và giải phóng tài nguyên phù hợp.