n진수 → 10진수

print(int('111',2))
print(int('222',3))
print(int('333',4))
print(int('444',5))
print(int('555',6))
print(int('FFF',16))

"""
7
26
63
124
215
4095
"""

10진수 → 2, 8, 16진수

print(bin(10))
print(oct(10))
print(hex(10))

"""
0b1010
0o12
0xa
"""

10진수 → n진수

tmp = "0123456789ABCDEF"


def convert(num, base):
    q, r = divmod(num, base)
    if q == 0:
        return tmp[r]
    else:
        return convert(q, base) + tmp[r]

print(convert(10,2))
print(convert(10,3))
print(convert(10,4))
print(convert(10,5))
"""
1010
101
22
20
"""

또는

def convert(num, base):
    result = ""
    while num:
        result += str(num % base)
        num = num // base
    return result[::-1]

n진수 → n진수

tmp = "0123456789ABCDEF"


def convert(num, base):
    q, r = divmod(num, base)
    if q == 0:
        return tmp[r]
    else:
        return convert(q, base) + tmp[r]

print(convert(int('a',16),2))
print(convert(int('4',5),3))
print(convert(int('2',3),4))
print(convert(int('11',2),5))
"""
1010
101
22
20
"""