python - 如何从字符串中修剪空格？

Question

如何从 Python 中的字符串中删除前导空格和尾随空格？

" Hello world " --> "Hello world"
" Hello world"  --> "Hello world"
"Hello world "  --> "Hello world"
"Hello world"   --> "Hello world"

Answer 1

要删除字符串周围的所有空格，请使用 .strip() .例子:

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

请注意 str.strip()删除所有空白字符，包括制表符和换行符。要仅删除空格，请将要删除的特定字符指定为 strip 的参数:

>>> "  Hello\n  ".strip(" ")
'Hello\n'

---

最多只删除一个空格:

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

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