Question

How can I convert string into integer and remove every character from that change.
Example:

S = "--r10-" I want to have this: S = 10

This not work:

S = "--10-"
int(S)

Answer 1

You can use filter(str.isdigit, s) to keep only those characters of s that are digits:

>>> s = "--10-"
>>> int(filter(str.isdigit, s))
10

Note that this might lead to unexpected results for strings that contain multiple numbers

>>> int(filter(str.isdigit, "12 abc 34"))
1234

or negative numbers

>>> int(filter(str.isdigit, "-10"))
10

Edit: To make this work for unicode objects instead of str objects, use

int(filter(unicode.isdigit, u"--10-"))