Removing non numeric characters from a string

Question

I have been given the task to remove all non numeric characters including spaces from a either text file or string and then print the new result next to the old characters for example:

Before:

sd67637 8 

After:

676378 

As i am a beginner i do not know where to start with this task. Please Help

Answer 1

The easiest way is with a regexp

import re a = 'lkdfhisoe78347834 (())&/&745  ' result = re.sub('[^0-9]','', a)  print result >>> '78347834745' 

Answer 2

Loop over your string, char by char and only include digits:

new_string = ''.join(ch for ch in your_string if ch.isdigit()) 

Or use a regex on your string (if at some point you wanted to treat non-contiguous groups separately)...

import re s = 'sd67637 8'  new_string = ''.join(re.findall(r'\d+', s)) # 676378 

Then just print them out:

print(old_string, '=', new_string)