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Pythonで10進数→N進数変換とN進数→10進数変換

Last updated at Posted at 2021-09-26

N進数から10進数への変換

int()関数の第2引数に指定した基数から10進数に変換してくれる

print(int('100', 2)) # 4
print(int('100', 3)) # 9

2つ目の引数には2〜36までの値を指定しないとエラーとなる

10進数からN進数への変換

2進数、8進数、16進数への変換

base10 = 10
print(format(base10, 'b')) # 1010
print(format(base10, 'o')) # 12
print(format(base10, 'x')) # a
print(type(format(base10, 'b'))) # <class 'str'>

変換後の型は文字列型である
2進数はbinaryの略でb
8進数はoctalの略でo
16進数はhexadecimalの略でx

2進数、8進数、16進数以外への変換

numpyをimportしてbase_repr関数を使うと良い

import numpy as np

print(np.base_repr(10, 7)) # 13
print(np.base_repr(13, 15)) # D
print(np.base_repr(-130, 20)) # -6A
print(np.base_repr(100, 36)) # 2S
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