complex() Builtin Function

Python - complex()

Python complex() builtin function is used to define a complex number with real and imaginary parts.

complex() returns a complex number created using the given real and/or imaginary parts as arguments.

In this tutorial, you will learn the syntax of complex() function, and then its usage with the help of example programs.

The syntax of complex() function is

complex(real, imaginary)

where

Parameter	Description
`real`	An integer, or decimal point value.
`imaginary`	An integer, or decimal point value.

In the following program, we create a complex type object with real and imaginary parts passed as arguments to complex() function.

Python Program

real = 5
imaginary = 8
output = complex(real, imaginary)
print(f'complex() : {output}')

Output

complex() : (5+8j)

In the following program, we create a complex type object by passing only real part as argument to complex() function.

The default value of imaginary parameter is 0. real parameter is mandatory.

Python Program

real = 5
output = complex(real)
print(f'complex() : {output}')

Output

complex() : (5+0j)

In this tutorial of Python Examples, we learned the syntax of complex() function, and how to create a complex number, with examples.