str.replace multiple values python

How to replace multiple substrings of a string?

stackoverflow.com › questions › 6116978 › how-to-replace-multiple-substrings-of-a-string

Here is a short example that should do the trick with regular expressions:

import re

rep = {"condition1": "", "condition2": "text"} # define desired replacements here

# use these three lines to do the replacement
rep = dict((re.escape(k), v) for k, v in rep.items()) 
pattern = re.compile("|".join(rep.keys()))
text = pattern.sub(lambda m: rep[re.escape(m.group(0))], text)

For example:

>>> pattern.sub(lambda m: rep[re.escape(m.group(0))], "(condition1) and --condition2--")
'() and --text--'

Answer from Andrew Clark on Stack Overflow

Stack Overflow

stackoverflow.com › questions › 6116978 › how-to-replace-multiple-substrings-of-a-string

python - How to replace multiple substrings of a string? - Stack Overflow

Top answer

1 of 16

385

Here is a short example that should do the trick with regular expressions:

import re

rep = {"condition1": "", "condition2": "text"} # define desired replacements here

# use these three lines to do the replacement
rep = dict((re.escape(k), v) for k, v in rep.items()) 
pattern = re.compile("|".join(rep.keys()))
text = pattern.sub(lambda m: rep[re.escape(m.group(0))], text)

For example:

>>> pattern.sub(lambda m: rep[re.escape(m.group(0))], "(condition1) and --condition2--")
'() and --text--'

2 of 16

199

You could just make a nice little looping function.

def replace_all(text, dic):
    for i, j in dic.iteritems():
        text = text.replace(i, j)
    return text

where text is the complete string and dic is a dictionary — each definition is a string that will replace a match to the term.

Note: in Python 3, iteritems() has been replaced with items()

Careful: Python dictionaries don't have a reliable order for iteration. This solution only solves your problem if:

order of replacements is irrelevant
it's ok for a replacement to change the results of previous replacements

Update: The above statement related to ordering of insertion does not apply to Python versions greater than or equal to 3.6, as standard dicts were changed to use insertion ordering for iteration.

For instance:

d = { "cat": "dog", "dog": "pig"}
my_sentence = "This is my cat and this is my dog."
replace_all(my_sentence, d)
print(my_sentence)

Possible output #1:

"This is my pig and this is my pig."

Possible output #2

"This is my dog and this is my pig."

One possible fix is to use an OrderedDict.

from collections import OrderedDict
def replace_all(text, dic):
    for i, j in dic.items():
        text = text.replace(i, j)
    return text
od = OrderedDict([("cat", "dog"), ("dog", "pig")])
my_sentence = "This is my cat and this is my dog."
replace_all(my_sentence, od)
print(my_sentence)

Output:

"This is my pig and this is my pig."

Careful #2: Inefficient if your text string is too big or there are many pairs in the dictionary.

Using replace() function to replace multiple texts(strings) at once in Python

How to do multiple string replacements in a cleaner manner? - Python

python - String replace with multiple items

Replacing multiple values in a string - Python

python - Replace multiple instances of a sub-string with items in a list

More results from stackoverflow.com

Python.org

discuss.python.org › python help

Is there an easier way to replace multiple different things at once - Python Help - Discussions on Python.org

March 14, 2022 - im trying to use the .replace() mutiple times at once and i was wondering if there was a cleaner way to do it Code example: with open("user_data.txt", "w") as f: f.write(str(user_data).replace("{","{\n").replace("}","\n}").replace(",",",\n")) f.close() the code works fine but looks a bit messy

Discussions

Which is the better way to include multiple '.replace()' ?

For this case, why not just timestamp = time.strftime("%Y%m%d_%H%M%S", t_obj) More on reddit.com

r/learnpython

January 1, 2023

Feature Proposal: Multi-String Replacement Using a Dictionary in the .replace() Method - Ideas - Discussions on Python.org

Summary: I would like to propose an extension to the .replace() method to allow multiple substring replacements in a string using a dictionary. Currently, .replace() accepts only two arguments (the value to be replaced and the replacement value), which results in the need for multiple calls ... More on discuss.python.org

discuss.python.org

October 21, 2024

Vectorized .str.replace() for multiple characters in pandas

I think my count and year columns are breaking because of the if statement excluding those two columns. More on reddit.com

r/learnpython

June 9, 2022

python - Replace multiple substrings in a Pandas series with a value - Stack Overflow

Thanks for sharing, but when I ... and 'str'". What did I do wrong here? 2022-11-18T21:16:28.637Z+00:00 ... Thanks a lot Cam! It works. Apparently it's due to my poor regex knowledge. I suppose \s captures whitespaces. What was wrong with my method tho? 2022-11-21T21:19:24.843Z+00:00 ... def replace_values(series, ... More on stackoverflow.com

stackoverflow.com

Videos