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I have a list of items which look like so:
2.4 -2.0 4.3
-6.0 12.5 1.0
What I would like is to remove all those spaces and replace them with "," (comma) except for the spaces in front of first numbers (they should be just deleted (the spaces) and not replaced with anything). So the upper string items should look like so, after replacement:
2.4,-2.0,4.3
-6.0,12.5,1.0
Not like this:
,2.4,-2.0,4.3
,-6.0,12.5,1.0
Which is what the following code does:
newStrings = []
for s in strings:
newStrings.append(re.sub('\s+', ',', s))
What regular expression for re.sub should be used to achieve that? Thank you.
479
If you want to replace a string that matches a regular expression (regex) instead of perfect match, use the sub() of the re module. In re. sub() , specify a regex pattern in the first argument, a new string in the second, and a string to be processed in the third.
sub() function to erase commas from the python string. The function re. sub() is used to swap the substring. Also, it will replace any match with the other parameter, in this case, the null string, eliminating all commas from the string.
You can remove comma from string in python by using string's replace() method.
To remove the leading and trailing spaces you can use .strip(), and then to replace consecutive whitespace characters using the regular expression \s+:
>>> import re
>>> s = " 2.4 -2.0 4.3"
>>> re.sub("\s+", ",", s.strip())
'2.4,-2.0,4.3'
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