Python按索引从字符串中删除字符的最佳方法
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Python best way to remove char from string by index
提问by Alvaro Joao
I'm removing an char from string like this:
我正在从这样的字符串中删除一个字符：
S = "abcd"
Index=1 #index of string to remove
ListS = list(S)
ListS.pop(Index)
S = "".join(ListS)
print S
#"acd"
I'm sure that this is notthe best way to do it.
我确信这不是最好的方法。
EDITI didn't mentioned that I need to manipulate a string size with length ~ 10^7. So it's important to care about efficiency.
编辑我没有提到我需要操纵长度为 ~ 10^7 的字符串大小。所以关注效率很重要。
Can someone help me. Which pythonic way to do it?
有人能帮我吗。哪种pythonic方法可以做到？
回答by Mad Physicist
You can bypass all the list operations with slicing:
您可以通过切片绕过所有列表操作：
S = S[:1] + S[2:]
or more generally
或更一般地
S = S[:Index] + S[Index + 1:]
Many answers to your question (including ones like this) can be found here: How to delete a character from a string using python?. However, that question is nominally about deleting by value, not by index.
您的问题的许多答案（包括此类）可以在这里找到：How to delete a character from a string using python? . 然而，这个问题名义上是关于按值删除，而不是按索引删除。
回答by Iron Fist
Slicing is the best and easiest approach I can think of, here are some other alternatives:
切片是我能想到的最好和最简单的方法，这里有一些其他的选择：
>>> s = 'abcd'
>>> def remove(s, indx):
return ''.join(x for x in s if s.index(x) != indx)
>>> remove(s, 1)
'acd'
>>>
>>>
>>> def remove(s, indx):
return ''.join(filter(lambda x: s.index(x) != 1, s))
>>> remove(s, 1)
'acd'
Remember that indexing is zero-based.
请记住，索引是从零开始的。
回答by min2bro
You can replace the Index character with "".
您可以用“”替换索引字符。
str = "ab1cd1ef"
Index = 3
print(str.replace(str[Index],"",1))
回答by Kate Kiatsiri
def missing_char(str, n):
front = str[:n] # up to but not including n
back = str[n+1:] # n+1 through end of string
return front + back
