Eliminate numbers in string in Python

Question

I’d like to eliminate numbers in a string in Python.

str = "aaaa22222111111kkkkk"

I want this to be "aaaakkkkk".

I use re.sub to replace, but it doesn't work:

str = "aaaa22222111111kkkkk"
str = re.sub(r'^[0-9]+$',"",str)

Maybe, this replaces a string which only contains numbers with "".

How should I do with this?

Related: [removing characters except digits from string](http://stackoverflow.com/questions/1450897/python-removing-characters-except-digits-from-string) — fredtantini, Dec 23 '14 at 11:31
This is not the same question.Also the doubts of OP are different.Nominated for reopening — vks, Dec 23 '14 at 11:33
Don't need to reopen, since the answer is in the comments. `^` represents the start of a line and `$` represents the end of the line. So your regex will remove those lines which contains only digits. — Avinash Raj, Dec 23 '14 at 11:34
since you are not looking for negative numbers, `not str.isdigit()` would be better. `"".join([x for x in s if not x.isdigit()])` — Padraic Cunningham, Dec 23 '14 at 12:02

score 2 · Accepted Answer · answered Dec 23 '14 at 11:25

2

your regex is wrong:

re.sub(r'[0-9]',"",str)

should work:

>>> str="aaaa22222111111kkkkk"
>>> re.sub(r'[0-9]',"",str)
'aaaakkkkk'

answered Dec 23 '14 at 11:25

WeaselFox

Thanks you.I found what was wrong.But this question seems to be controversial.I don't know what to do so I'll let it go. – user3119018 Dec 23 '14 at 11:38
1

str is a bad variable name – Padraic Cunningham Dec 23 '14 at 12:02

1 Answers1