September 2014
Intermediate to advanced
332 pages
6h 48m
Japanese
Content preview from Python文法詳解
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63
3.14 複素数
float.is_integer()
値の小数点以下がゼロで、
inf
や
nan
でない整数の値なら、
True
を返します。
>>> (-2.0).is_integer()
True
>>> (3.2).is_integer()
False
3.14
複素数
Python
では、複素数を組込の
complex
型としてサポートしています。
複素数リテラルは、虚部の数字に
'j'
か
'J'
をつけて記述します。実部を書くためのリテラルは
用意されていませんので、整数や浮動小数点数との加算・減算を使って全体を記述します。
例
:
1 + 2.0j
3.0-4e2j
5j
複素数オブジェクトは、実部と虚部の値を属性
real
と
imag
で参照できます。複素数オブジェク
トは更新不能なオブジェクトで、オブジェクトを作成した時に指定した値は、後から変更できませ
ん。
3.14.1
complex
型
複素数オブジェクトは、
complex
型のオブジェクトです。文字列や浮動小数点数を、
complex
型
オブジェクトで複素数に変換できます。
complex([
real
, [
imag
]])
パラメタ
real
−
実部の値を指定します。
imag
−
虚部の値を指定します。
引数を指定しなければ、
0j
を返します。
>>> complex()
0j
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