【argv】文件A内容copy到文件B中

使用脚本，复制start.txt内容，粘贴到end.txt中

from sys import argv
from os.path import exists

script, from_file, to_file = argv
print("Copying from %s to %s." % (from_file, to_file))

# read读取in_file(start.txt)里面的内容
in_file = open(from_file)
indata = in_file.read()
print("The input file is  %d bytes long." % (len(indata)))

# 使用exists判断to_file(即没有write权限的end.txt)是否存在
print("Does the output file exist? %r" % exists(to_file))
print("Ready, hit RETURN to continue, CTRL-C to about.")
input()

# 打开out_file(end.txt),写入indata(start.txt的文本内容)
out_file = open(to_file, 'w')
out_file.write(indata)

print("Alright, all done.")

# 关闭in_file(start.txt),out_file(end.txt)
out_file.close()
in_file.close()

　　cmd中：

python test.py start.txt end.txt　　# test.py 为脚本文件，start.txt为初始文件

　　结果如下：