Simple byte array to hex string converter

bytehex.py

''
Python BIFs hex() and int() are fairly useful, but byte arrays seem to trip them up.
'''

'''random key (byte array)'''
from os import urandom
key=urandom(32)

'''hex string functions'''
def toHex(x):
    '''byte array->hex string'''
    numerals="0123456789abcdef"
    result=""
    for y in x:
        result=result+(numerals[int(int(y)/16)]+numerals[int(int(y)%16)])
    return '0x'+result

def fromHex(x):
    '''hex string->byte array'''
    numerals="0123456789abcdef"
    result=[]
    x=x[2:]
    for i in range(int(len(x)/2)):
        a=numerals.find(x[i*2])
        b=numerals.find(x[i*2+1])
        result.append(a*16+b)
    return bytes(result)

if fromHex(toHex(key))==key:
    print("fromHex(toHex(key)) == key")
else:
    print("fromHex(toHex(key)) != key")