How do I trim whitespace from a Python string?

 

How do I remove leading and trailing whitespace from a string in Python?

For example: 

" Hello " --> "Hello"
" Hello"  --> "Hello"
"Hello "  --> "Hello"
"Bob has a cat" --> "Bob has a cat"

Just one space, or all such spaces? If the second, then strings already have a .strip() method: 

>>> ' Hello '.strip()
'Hello'
>>> ' Hello'.strip()
'Hello'
>>> 'Bob has a cat'.strip()
'Bob has a cat'
>>> '          Hello        '.strip()  # ALL spaces at ends removed
'Hello'

If you need only to remove one space however, you could do it with: 

def strip_one_space(s):
    if s.endswith(" "): s = s[:-1]
    if s.startswith(" "): s = s[1:]
    return s

>>> strip_one_space("   Hello ")
'  Hello'

Also, note that str.strip() removes other whitespace characters as well (eg tabs and newlines). To remove only spaces, you can specify the character to remove as an argument to strip , ie: 

>>> "  Hellon".strip(" ")
'Hellon'

As pointed out in answers above 

myString.strip()

will remove all the leading and trailing whitespace characters such as n, r, t, f, space.

For more flexibility use the following

  • Removes only leading whitespace chars: myString.lstrip()
  • Removes only trailing whitespace chars: myString.rstrip()
  • Removes specific whitespace chars: myString.strip('n') or myString.lstrip('nr') or myString.rstrip('nt') and so on.

    • More details are available in the docs

    strip并不限于空白字符： 

    # remove all leading/trailing commas, periods and hyphens
title = title.strip(',.-')
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