# Python complex() Function

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### 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

• complex ([real[, imaginary]])

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.

• # Python complex() function example
# Calling function
a = complex(1) # Passing single parameter
b = complex(1,2) # Passing both parameters
# Displaying result
print(a)
print(b)

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.

• # Python complex() function example
# Calling function
a = complex(1.5) # Passing single parameter
b = complex(1.5,2.2) # Passing both parameters
# Displaying result
print(a)
print(b)

Output:

• (1.5+0j)
(1.5+2.2j)

Python complex() Function Example 3

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

• # Python complex() function example
# Calling function
a = complex(‘1’) # Passing single parameter
b = complex(‘1.5’)
# Displaying result
print(a)
print(b)

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.

• # Python complex() function example
# Calling function
a = complex(‘1′,’2’) # Passing two parameter
# Displaying result
print(a)

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.

• # Python complex() function example
# Calling function
a = complex(1+2j) # Passing single parameter
b = complex(1+2j,2+3j) # Passing both parameters
# Displaying result
print(a)
print(b)

Output:

• (1+2j)
(-2+4j)

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