python读取文本文件，如何将每行最后一个特定字符替换？ python怎么把字符串最后一个字符去掉
python\u66ff\u6362\u6700\u540e\u4e00\u4e2a\u5b57\u7b26python\u4ee3\u7801\u7f16\u7a0b\u4e2d\u7528re\u6a21\u5757\u901a\u8fc7\u6b63\u5219\u5339\u914d\u7684\u65b9\u5f0f\uff0c\u66ff\u6362\u4e00\u4e2a\u5b57\u7b26\u4e32\u7684\u6700\u540e\u4e00\u4e2a\u5b57\u7b26\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a
import re//\u7528X\u66ff\u6362\u540e\u9762\u7684abcreplace_reg = re.compile(r'abc$')print replace_reg.sub('X', '123abc')#\u8fd0\u884c\u7ed3\u679c\uff1a'123X'
Python\u7f16\u7a0b\u57fa\u784021\uff1a\u5b57\u7b26\u4e32\u5bf9\u9f50\u548c\u5934\u5c3e\u5b57\u7b26\u6d88\u9664
方法：
解释，s.count('/')计算原来有多少个特定字符串，然后第一步全部替换，第二步将count-1个还原
按照你的要求编写的用正则表达式替换的Python程序如下(注意图中源代码的缩进)
import re
with open("test.txt",'r') as f:
for line in f:
line_data=line.strip("
")
result=re.sub(r'^(.*)/',r'\1\\',line_data)
print(result)
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