Python 文件Hash(MD5,SHA1)

import hashlib
import os,sys

def CalcSha1(filepath):
        with open(filepath,'rb') as f:
                sha1obj = hashlib.sha1()
                sha1obj.update(f.read())
                hash = sha1obj.hexdigest()
                print(hash)
                return hash

def CalcMD5(filepath):
        with open(filepath,'rb') as f:
                md5obj = hashlib.md5()
                md5obj.update(f.read())
                hash = md5obj.hexdigest()
                print(hash)
                return hash
                
if __name__ == "__main__":
        if len(sys.argv)==2 :
                hashfile = sys.argv[1]
                if not os.path.exists(hashfile):
                        hashfile = os.path.join(os.path.dirname(__file__),hashfile)
                        if not os.path.exists(hashfile):
                                print("cannot found file")
                        else
                                CalcMD5(hashfile)
                else:
                                CalcMD5(hashfile)
                        #raw_input("pause")
        else:
                print("no filename")