Complex () function in Python

In Python, the complex () function returns a complex number when the user provides a virtual and real part, or turns a string into a complex number. How does the complex () function syntax, what parameters do it have, and how is it used? Invites you to read the track.

Complex () function syntax in Python

 complex ([phanthuc [, phanao]]) 

Complex function parameters ()

complex has two parameters:

1. phanthuc: the real part of the complex number returns, if this parameter is left blank, Python defaults to 0.
2. phanao: the virtual part of the complex number returns, if this parameter is left blank, Python defaults to 0.

If the first parameter passed into complex is a string, it will be interpreted as a complex number. In this case you should not pass the second parameter.

The value returned from complex ()

The complex () function returns a complex number.

If the string is passed into a function that is not a complex number, an exception (exception) ValueError will occur .

Note: The transmitted string must be in phanthuc + phanaoj or phanthuc + phanaoJ format.

Example 1: How to create complex numbers in Python

 z = complex(2, -3) 
 print(z) 
 
 z = complex(1) 
 print(z) 
 
 z = complex() 
 print(z) 
 
 z = complex('5-9j') 
 print(z) 

Run the program, the result is:

 (2-3j) 
 (1 + 0j) 
 0j 
 (5-9j) 

Example 2: Complex numbers do not use complex () function

In Python, you can create a complex number without using the complex () function .

To do that, you must put 'j' or 'J' after some to Python identity.

 a = 2+3j 
 print('a =',a) 
 
 b = -2j 
 print('b =',b) 
 
 c = 0j 
 print('c =',c) 

The output returned is:

 a = (2+3j) 
 b = (-0-2j) 
 c = 0j 
 

See more:

1. Built-in Python functions
2. Python functions are user defined
3. Variable types in Python

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