Python complex() Function

Python complex() function is used to convert numbers or string into a complex number. This method takes two optional parameters and returns a complex number. The first parameter is called a real and second as imaginary parts.

Signature

Parameters

real: It is an optional numeric parameter.

imaginary: It is an optional numeric parameter.

Return

It returns a complex number.

Let’s see some examples of complex() function to understand it’s functionality.

Python complex() Function Example 1

It is a simple example which shows the usage of complex() function. Here, we are passing all the argument of integer type.

Output:

(1+0j)  (1+2j)  

Python complex() Function Example 2

Here, we are passing float type values, and the output generated by the function is also float type.

Output:

(1.5+0j)  (1.5+2.2j)  

Python complex() Function Example 3

It also allows string parameters but should be an integer value.

Output:

(1+0j)  (1.5+0j)  

Python complex() Function Example 4

It allows only one string parameter. If the first argument is a string type, it does not allow to pass the second argument. It generates an error if we pass the second parameter.

Output:

TypeError: complex() can't take the second arg if first is a string  

Python complex() Function Example 5

It also allows passing a complex number as a parameter. See the example below.

Output:

(1+2j)  (-2+4j)