Help on HASH object:

class HASH(builtins.object)

 |  A hash represents the object used to calculate a checksum of a

 |  string of information.

 |

 |  Methods:

 |

 |  update() -- updates the current digest with an additional string

 |  digest() -- return the current digest value

 |  hexdigest() -- return the current digest as a string of hexadecimal digits

 |  copy() -- return a copy of the current hash object

>>> from hashlib import md5

>>> e='lilip@email.com'

>>> print(e)

lilip@email.com

>>> e_encode=e.lower().encode('utf-8')

>>> print(e_encode)

b'lilip@email.com'

>>> e_md5=md5(e_encode)

>>> print(e_md5)

<md5 HASH object @ 0x0000000002961B20>

>>> e_hex=e_md5.hexdigest()　　         #转换为十六进制

>>> print(e_hex)

d56e0ee2ffdd3c8e8f75219044e6b781

>>> e_digest=e_md5.digest()　　         #转换为二进制

>>> print(e_digest)

b'\xd5n\x0e\xe2\xff\xdd<\x8e\x8fu!\x90D\xe6\xb7\x81'

>>> e_copy=e_md5.copy()                #copy用法

>>> print(e_copy)

<md5 HASH object @ 0x0000000002961B48>

>>> print(e_md5)

<md5 HASH object @ 0x0000000002961B20>

>>> e_md5.update('test'.encode('utf-8'))      #update用法

>>> print(e_md5)

<md5 HASH object @ 0x0000000002961B20>

>>> print(e_md5.hexdigest())

8b3b5ccd79b8a1c6aa50e40ad1e479b8