find non digits in a string python code example

Example 1: python only numbers in string

string = "abc123"
# Method 1
''.join(char for char in string if char.isdigit())

#Method 2
import re
re.sub("[^0-9]", "", string)

Example 2: python how to check if string contains only numbers

print("012345".isdecimal())
OUTPUT
True
print("a12345".isdecimal())
OUTPUT
False