Python 条带方法
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Python strip method
提问by Rajesh Kumar
Today in python terminal, I tried
今天在python终端，我试过了
a = "serviceCheck_postmaster"
a.strip("serviceCheck_")
But instead of getting "postmaster", I got "postmast".
但"postmaster"我没有得到，而是得到了"postmast"。
What could cause this? And how can I get "postmaster"as output?
什么可能导致这种情况？我怎样才能得到"postmaster"输出？
回答by Martijn Pieters
You are misunderstanding what .strip()does. It removes anyof the characters found in the string you pass. From the str.strip()documentation:
你是误会了什么.strip()呢。它删除在您传递的字符串中找到的任何字符。从str.strip()文档：
The charsargument is a string specifying the setof characters to be removed.
的字符参数是字符串指定一组待删除的字符。
emphasis mine; the word setthere is crucial.
强调我的；这个词set很关键。
Because charsis treated as a set, .strip()will remove all s, e, r, v, i, c, C, h, kand _characters from the start and end of your input string. So the eand rcharacters from the endof your input string were also removed; those characters are part of the set.
因为chars作为一组处理，.strip()将删除所有s，e，r，v，i，c，C，h，k并_从你的输入字符串的开始和结束字符。因此，输入字符串末尾的e和r字符也被删除了；这些字符是集合的一部分。
To remove a string from the start or end, use slicing instead:
要从开头或结尾删除字符串，请改用切片：
if a.startswith('serviceCheck_'):
a = a[len('serviceCheck_'):]
回答by Harpal
An alternative to Martijn's answer to would to use str.replace()
Martijn's answer to would to use 的另一种选择 str.replace()
>>> a = "serviceCheck_postmaster"
>>> a.replace('serviceCheck_','')
'postmaster'
回答by Todd
You can also isolate "postmaster" with something like this:
您还可以使用以下内容隔离“postmaster”：
a = "serviceCheck_postmaster"
b = a.split("_")[1] # split on underscore and take second item
回答by kvivek
If you carefully look at the help of the strip function It says like this:
如果仔细看strip函数的帮助，是这样写的：
Help on built-in function strip:
strip(...)
S.strip([chars]) -> string or unicode
Return a copy of the string S with leading and trailing
whitespace removed.
If chars is given and not None, remove characters in chars instead.
If chars is unicode, S will be converted to unicode before stripping
It will remove all the leading and trailing character and whitespaces. In your case the character sets are
它将删除所有前导和尾随字符和空格。在你的情况下，字符集是
s, e, r, v, i, c, C, h, k and _
You can get the postmaster by something like this
你可以通过这样的方式得到邮局局长
a = "serviceCheck_postmaster"
print a.split("_")[1]
回答by Akinsete akin
Strip will take away all the letter you input into its function. So for the reason why the letter ‘e' and ‘r' were stripped of postmaster. Try: a = “serviceCheck_postmaster” print(a[13:])
Strip 将带走您在其功能中输入的所有字母。所以因为字母'e'和'r'被剥夺了postmaster的原因。尝试： a = “serviceCheck_postmaster” print(a[13:])
