What does complex mean in python?

complex() function is used to create a complex number with a value of real imag * j or to convert a string or number into a complex number. If the first parameter is a string, there is no need to specify the second parameter. (Recommended: Python Programming Video)

Grammar

complex Grammar:

class complex([real[, imag]])

Parameter description:

real -- int, long, float or string;

imag -- int, long, float;

Return value

Returns a complex number.

Examples

The following examples demonstrate the use of complex:

>>>complex(1, 2)
(1 + 2j)
 
>>> complex(1)    # 数字
(1 + 0j)
 
>>> complex("1")  # 当做字符串处理
(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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