python函數之complex()函數

complex([real[, imag]])

中文說明：

建立一個值為real + imag * j的複數或轉換一個字串或數為複數。如果第一個參數為字串，則不需要指定第二個參數。

參數real: int, long, float或字串；

參數imag: int, long, float。

英文說明：

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 com ). 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.

#程式碼實例：

>>> 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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