如何从Python字符串中修剪空格？

Question

如何从Python中的字符串中删除前导和尾随空格？

例如:

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

Answer 1

只有一个空间,还是所有这样的空间？如果是第二个,那么字符串已经有了一个.strip()方法:

>>> ' 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'

如果您只需要移除一个空格,则可以使用以下方法:

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

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

另外,请注意str.strip()删除其他空格字符(例如制表符和换行符).要仅删除空格,可以指定要作为参数删除的字符strip,即:

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

Answer 2

正如上面的答案所指出的那样

myString.strip()

将删除所有前导和尾随空白字符,例如\n,\ r,\ t,\ t,\ t\t,空格.

为了更灵活,请使用以下内容

• 仅删除前导空格字符:myString.lstrip()
• 仅删除尾随空格字符:myString.rstrip()
• 删除特定的空格字符:myString.strip('\n')或myString.lstrip('\n\r')或myString.rstrip('\n\t')等等.

更多详细信息可在文档中找到

Answer 3

strip 不仅限于空格字符:

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

Answer 4

这将删除所有前导和尾随空格myString:

myString.strip()

Answer 5

你想要strip():

myphrases = [ " Hello ", " Hello", "Hello ", "Bob has a cat" ]

for phrase in myphrases:
    print phrase.strip()