python文件的md5加密方法

from hashlib import md5
def md5_file(name):
m = md5()
a_file = open(name, 'rb') #需要使用二进制格式读取文件内容
m.update(a_file.read())
a_file.close()
return m.hexdigest()
if __main__ == '__init__':
print md5_file('d:/test.txt')

#!/usr/bin/python
#encoding=utf-8
import io
import sys
import hashlib
import string
def printUsage():
print ('''''Usage: [python] pymd5sum.py <filename>''')
def main():
if(sys.argv.__len__()==2):
#print(sys.argv[1])
m = hashlib.md5()
file = io.FileIO(sys.argv[1],'r')
bytes = file.read(1024)
while(bytes != b''):
m.update(bytes)
bytes = file.read(1024)
file.close()
#md5value = ""
md5value = m.hexdigest()
print(md5value+"\t"+sys.argv[1])
#dest = io.FileIO(sys.argv[1]+".CHECKSUM.md5",'w')
#dest.write(md5value)
#dest.close()
else:
printUsage()
main()

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