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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