python替换最后一个字符 python怎么把字符串最后一个字符去掉
python\u600e\u4e48\u628a\u5b57\u7b26\u4e32\u6700\u540e\u4e00\u4e2a\u5b57\u7b26\u53bb\u6389\u8fd9\u4e2a\u5f88\u5bb9\u6613\u5b9e\u73b0\uff0c\u76f4\u63a5\u5207\u7247\u5c31\u884c
\u6bd4\u5982:
>>> abc = 'abcd'
>>> abc[:-1]
'abc'
>>>
\u8fd9\u6837str[:-1]\u5c31\u53ef\u4ee5\u4e86
Python\u7684\u5b57\u7b26\u4e32\u7684\u5207\u7247(slice)\u53ef\u4ee5\u5f88\u65b9\u4fbf\u5730\u5b9e\u73b0\u8fd9\u4e00\u529f\u80fd
\u5728Python\u91cc\uff0c-1\u8868\u793a\u5b57\u7b26\u4e32\u6700\u540e\u4e00\u4e2a\u5143\u7d20\u7684\u7d22\u5f15
\u540c\u65f6\u7d22\u5f15\u662f\u4e0d\u5305\u542b\u7ed3\u5c3e\u5143\u7d20\u7684\uff0c\u56e0\u6b64\u628a\u6700\u540e\u4e00\u4e2a\u5b57\u7b26\u53bb\u6389\u53ef\u4ee5\u7528\u4e0b\u9762\u7684\u4ee3\u7801\u5b9e\u73b0
s = "123456"print(s[:-1])
python代码编程中用re模块通过正则匹配的方式，替换一个字符串的最后一个字符，代码如下：
import re
//用X替换后面的abc
replace_reg = re.compile(r'abc$')
print replace_reg.sub('X', '123abc')
#运行结果：'123X'
def rep_split(infile,spliter,repter):
with open(infile,'r') as sp_file:
for line in sp_file:
newline=line[::-1].replace(spliter,repter,1)[::-1]
print(newline)
#open('out.txt','a').writelines(outline)
rep_split('1kk.txt','\\',' ')
函数参数说明：第一个为输入文件，第二个为需要替换的分隔符，第三个为目标替换符号
效果如下
>>>
a\b\ccc ddd
xxx\y zzz
q w
>>> spliter = '\\'
>>> for ln in content.splitlines():
... x = ln.split(spliter)
... print spliter.join(x[:-1]), x[-1]
...
a\b\ccc ddd
xxx\y zzz
q w
>>>
def myreplace(s):
index = s.rfind("\\")
if index != -1:
s = s[:index]+" "+s[index+1:]
return s
text = open("yourfilename","r")
content = text.readlines()
text.close()
for name in content:
(four space here)print myreplace(name)
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