python文件读写demo

#! /usr/bin/python

srcFile = "test.src" #root of src file
dstFile = "test.dst" #root of dst file
sf = open(srcFile , 'r')
df = open(dstFile , 'w')
for line in sf:
#here you can do something with line
df.write(line)
sf.close()
df.close()

#! /usr/bin/python

File = "test.src" #root of file
file = open(File , 'r')
HistoryContent = file.read()
file.close()
file = open(srcFile , 'w')
file.write("new content\n")#here can be replaced by new content
file.write(HistoryContent)
file.close()