• Manual
• 直譯
• 實(shí)例
• 拓展閱讀

Manual

Return a complex number with the value real + imag*1j or convert a string or number to a complex number. If the first parameter is a string, it will be interpreted as a complex number and the function must be called without a second parameter. The second parameter can never be a string. Each argument may be any numeric type (including complex). If imag is omitted, it defaults to zero and the constructor serves as a numeric conversion like int and float. If both arguments are omitted, returns 0j.

Note When converting from a string, the string must not contain whitespace around the central + or - operator. For example, complex('1+2j') is fine, but complex('1 + 2j') raises ValueError.

The complex type is described in Numeric Types — int, float, complex.

直譯

以實(shí)部+虛部*1j形式返回一個(gè)復(fù)數(shù)，或?qū)⒆址驍?shù)字轉(zhuǎn)化為復(fù)數(shù)。如果第一個(gè)參數(shù)是字符串，它將會被轉(zhuǎn)化為復(fù)數(shù)，且函數(shù)的調(diào)用不能有第二個(gè)參數(shù)，第二個(gè)參數(shù)永遠(yuǎn)不能是字符串。每個(gè)參數(shù)可以使任意數(shù)值類型（包括復(fù)數(shù)）。如果缺省虛部，它默認(rèn)為0，構(gòu)造器會以整數(shù)或浮點(diǎn)數(shù)值進(jìn)行對待。如果兩個(gè)參數(shù)都缺省，則返回0j。

注意：當(dāng)從一個(gè)字符串轉(zhuǎn)化時(shí)，字符串在中間的‘+’或‘-’操作符周圍不能包含空格。例如：復(fù)數(shù)complex('1+2j')可行，但complex('1 + 2j')則會引發(fā)ValueError。

復(fù)數(shù)類型詳見數(shù)值類型—整數(shù)，浮點(diǎn)數(shù)和復(fù)數(shù)

實(shí)例

>>> complex(0) 0j >>> complex(3, 5) (3+5j) >>> complex(2.25, 163.33) (2.25+163.33j) >>> complex('1+2j') (1+2j) >>> complex('1 + 2j') Traceback (most recent call last):File "<pyshell#144>", line 1, in <module>complex('1 + 2j') ValueError: complex() arg is a malformed string >>> complex('1+2j', '6j') Traceback (most recent call last):File "<pyshell#145>", line 1, in <module>complex('1+2j', '6j') TypeError: complex() can't take second arg if first is a string

拓展閱讀

數(shù)值類型—整數(shù)，浮點(diǎn)數(shù)和復(fù)數(shù)

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