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complex([real[, imag]])
Chinese description:
Create a value of real + imag * j Pluralize or convert a string or number to a plural number. If the first parameter is a string, there is no need to specify the second parameter.
Parameter real: int, long, float or string;
Parameter imag: int, long, float.
English description:
Create a complex number with the value real + imag*j 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 function serves as a numeric conversion function like int(), long() 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, long, complex.
Code example:
>>> complex(1, 2) (1 + 2j) #数字 >>> complex(1) (1 + 0j) #当做字符串处理 >>> complex("1") (1 + 0j) #注意:这个地方在“+”号两边不能有空格,也就是不能写成"1 + 2j",应该是"1+2j",否则会报错 >>> complex("1+2j") (1 + 2j)
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