用python计算md5,sha1,crc32

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Linux下计算md5sum，sha1sum，crc：

命令输出

$md5sum hellof19dd746bc6ab0f0155808c388be8ff0 hello

$sha1sum hello79e560a607e3e6e9be2c09a06b7d5062cb5ed566 hello

$crc32 hello327213a2

Python也能做这个工作，其中md5和sha1需import hashlib, crc32可以import zlib

#test.py

#!/usr/bin/env pythonfrom hashlib import md5, sha1
from zlib import crc32
import sysdef getMd5(filename): #计算md5
mdfive = md5()
with open(filename, 'rb') as f:
mdfive.update(f.read())
return mdfive.hexdigest()def getSha1(filename): #计算sha1
sha1Obj = sha1()
with open(filename, 'rb') as f:
sha1Obj.update(f.read())
return sha1Obj.hexdigest()def getCrc32(filename): #计算crc32
with open(filename, 'rb') as f:
return crc32(f.read())if len(sys.argv) < 2:
print('You must enter the file')
exit(1)
elif len(sys.argv) > 2:
print('Only one file is permitted')
exit(1)filename = sys.argv[1]print('{:8} {}'.format('md5:', getMd5(filename)))
print('{:8} {}'.format('sha1:', getSha1(filename)))
print('{:8} {:x}'.format('crc32:', getCrc32(filename)))