在工作中，有可能有一些场景，例如我要替换我txt文档中，所有行中包含test文字的的行内容，例如我们可以替换为空，或者某一个特定字符串呢？不多说，上代码。。

def repalceString():

lineList = []

file = open('mytest.txt','r')

for (num,value) in enumerate(file):

if "test" in value:

lineList.append(num)

file.close()

fileRead = open('mytest.txt','r')

newFile = open("newTest.txt","w")

for (num,value) in enumerate(fileRead):

if num in lineList:

lineContent = value.replace(value,'myceshi')

newFile.write(lineContent)

else:

newFile.write(value)

fileRead.close()

newFile.close()

if __name__ == "__main__":

repalceString()