[Python] Why hexa decode need two digit

The hex Python function produce 0x0 for the 0 number:

>>> hex(0)
'0x0'


But bytes.fromhexa only accept hexa with minimum of two digits:

>>> bytes.fromhex(hex(0)[2:])
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: non-hexadecimal number found in fromhex() arg at position 1
>>> bytes.fromhex('00')
b'\x00'


Why bytes.fromhexa accept hexa from two digits and no with one digit ?

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