python判断两个文件是否相同

import hashlib
def getHash(f):
line=f.readline()
hash=hashlib.md5()
while(line):
hash.update(line)
line=f.readline()
return hash.hexdigest()
def IsHashEqual(f1,f2):
str1=getHash(f1)
str2=getHash(f2)
return str1==str2

if __name__ == '__main__':
f1=open("D:/2.iso","rb")
f2=open("E:/wenjian/1.iso","rb")
print  IsHashEqual(f1,f2)