This question already has answers here:
How to check if re.sub() has successfully replaced in python? [duplicate]
(2 answers)
Python: how to substitute and know whether it matched
(3 answers)
Closed 2 years ago.
I want to use re.subn in my program to get no of times changes are made but I can't figure it out how to write the code. I have written the program with re.sub and it works fine but If I use (re.sub(r'\bi\b','I',contents)) in this program it shows this error.
TypeError: write() argument must be str, not int
import re
with open ('Sample.txt','r') as rf:
contents=rf.read()
change=(re.sub(r'\bi\b','I',contents))
with open ('Sample2.txt','w') as wf:
wf.writelines(change)
Can someone please guide how can I use re.subn to get the count.
Thank you.
Related
This question already has answers here:
How do I validate a date string format in python?
(5 answers)
Closed 6 months ago.
Im trying to check if a user's input is following the pattern integer/integer/integer(like month/day/year) but i dont know how to use exactly the match function to define that the pattern contains "number",then "/",again "number" and "/"...
Check out https://regex101.com/ for a neat website to check your regex! This is implemented in python using the re library. https://docs.python.org/3/library/re.html
In your case, the pattern would be [0-9]{1,2}\/[0-9]{1,2}\/[0-9]{2,4}
This question already has answers here:
What do backticks mean to the Python interpreter? Example: `num`
(3 answers)
Meaning of the backtick character in Python
(2 answers)
Closed 1 year ago.
Lots of old python code I look in has this ` symbol around a lot of stuff, what does it do? Now it is not considered valid syntax, obviously.
And I don't think it is just another string identifier, its sometimes wrapped around functions in the code I'm looking at.
Any help will be appreciated.
This question already has answers here:
Function to dictate the replacements in re.sub method (Python)
(2 answers)
How to input a regex in string.replace?
(7 answers)
Closed 2 years ago.
I have this function here which I use to replace the a string like this 'ABCDe.CO' with 'ABCD-E.CO' in a pandas dataframe.
I don't understand how the group(0) part works, I can't find any documentation on it. Could someone explain to me what this function does or where I can read up on it?
(df.loc[df.country.eq('ST'), 'ticker'].str.replace('([a-z])', lambda x: '-'+x.group(0).upper()))
This question already has answers here:
Search and replace operation
(2 answers)
Closed 6 years ago.
I have written code to search and replace string in make command as per user input
make language='english' id=234 version=V1 path='/bin'
In above code i searched version=V1 and replace version with version=V2
import re
strings = "make language='english' id=234 version=V1 path='/bin'"
search_pattern= re.search('version=(.*?)\s', strings)
old_str = search_pattern.group(1)
print test.replace(old_str, "V2")
Can anyone help me write above code in pythonic way or any other way to write above code
It's very easy if you use str.replace
String = "make language='english' id=234 version=V1 path='/bin'"
String = String.replace("version=V1", "version=V2")
This question already has answers here:
python: how to get information about a function?
(5 answers)
Closed 8 years ago.
whenever I use help() on a method I get a weird looking output.
For example, help(obj.readline) gives me the following output:
Help on built-in function readline:
readline(...)
That's all i get. I don't know how to interpret it.Why there is no description about the method? Can somebody please explain to me what's going on?
Is this weird output?
>>> f = open('data.txt')
>>> help(f.readline)
Help on built-in function readline:
readline(...)
readline([size]) -> next line from the file, as a string.
Retain newline. A non-negative size argument limits the maximum
number of bytes to return (an incomplete line may be returned then).
Return an empty string at EOF.