If string contains replace python
I am trying to remove words from a string if they match a list. Show
It produces this output:
I want it to remove all the words matching the list. asked Feb 22, 2012 at 14:01
1 You are not keeping the result of
Note that your approach matches any substring, and not just full words. For example, it would remove the One way to address this would be to enclose each tag in a pair of
answered Feb 22, 2012 at 14:03
NPENPE 471k104 gold badges923 silver badges998 bronze badges 3 The method
Note that the answered Feb 22, 2012 at 14:04
Sven MarnachSven Marnach 544k114 gold badges914 silver badges816 bronze badges 0 Using your variables
returns:
answered Feb 22, 2012 at 14:11
eumiroeumiro 198k33 gold badges294 silver badges259 bronze badges 1 (1) (2) why are you printing on each iteration? The simplest modification you could do would be:
answered Feb 22, 2012 at 14:06
MarcinMarcin 47.3k17 gold badges122 silver badges198 bronze badges 0 IntroductionReplacing all or n occurrences of a substring in a given string is a fairly common problem of string manipulation and text processing in general. Luckily, most of these tasks are made easy in Python by its vast array of built-in functions, including this one. Let's say, we have a string that contains the following sentence:
Our goal is to replace the word
In this
article, we'll be using the replace()The simplest way to do this is by using the built-in function -
The first two parameters are required, while the third one is optional. Let's give it a try:
We've performed the operation on This code results in:
Again, the string in memory that To seemingly perform
this operation in-place, we can simply re-assign
Here, the new string generated by the Replace n Occurrences of a SubstringNow, what if we don't wish to change all occurrences of a substring? What if we want to replace the first n? That's where the third parameter of the
And this prints:
By default, the third parameter is set to change all occurrences. Substring Occurrences with Regular ExpressionsTo escalate the problem even further, let's say we want to not only replace all occurrences of a certain
substring, but replace all substrings that fit a certain pattern. Even this can be done with a one-liner, using regular expressions, and the standard library's Regular expressions are a complex topic with a wide range of use in computer science, so we won't go too much in-depth in this article but if you need a quick start you can check out our guide on Regular Expressions in Python. Check out our hands-on, practical guide to learning Git, with best-practices, industry-accepted standards, and included cheat sheet. Stop Googling Git commands and actually learn it! In its essence, a regular expression defines a pattern. For example, let's say we have a text about people who own cats and dogs, and we want to change both terms with the word Using the sub() FunctionWith the pattern sorted out, we're going to use the
The first argument is the pattern we're searching for (a string or a Optional arguments are
If the pattern doesn't match any substring, the original string will be returned unchanged:
This code prints:
Case-Insensitive Pattern MatchingTo perform case-insensitive pattern matching, for example, we'll set the flag parameter to
Now any
case-combination of
Using Pattern ObjectsLet's define a
Which gives us the output:
The subn() FunctionThere's
also a
The
The tuple looks like:
A
And it's used in a very similar way:
This results in:
ConclusionPython offers easy and simple functions for string handling. The easiest way to replace all occurrences of a
given substring in a string is to use the If needed, the standard library's Is there a Replace function for strings in Python?Python String replace() Method
The replace() method replaces a specified phrase with another specified phrase. Note: All occurrences of the specified phrase will be replaced, if nothing else is specified.
How do you replace a string in a string in Python?Syntax of replace(). old – old substring you want to replace.. new – new substring which would replace the old substring.. count – (Optional ) the number of times you want to replace the old substring with the new substring.. How do you replace a specific part of a string in Python?In Python, the . replace() method and the re. sub() function are often used to clean up text by removing strings or substrings or replacing them.
What is replace () in Python?The replace() method is a built-in functionality offered in Python programming. It replaces all the occurrences of the old substring with the new substring. Replace() returns a new string in which old substring is replaced with the new substring.
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