Can a function have no parameters python

Question

In the last article, we have seen how a user-defined function is created. The user-defined function has two parts – the function definition and the function call.The function definition may or may not have parameters and it may or may not return a value.

In this article, you will see an example of python function with no parameters, and no return.

Program to Compute Factorial of a Number

This program is a simple program that computes factorial of a given input number.

## Program To Compute Factorial of a Number
## Function Definition
def factorial_number():
    
     factorial = 1
     fact_number = int(input("Enter a Number to Get its Factorial: "))
     for i in range(1, fact_number + 1):
        factorial = factorial * i
     print("The factorial is" , factorial)
## Function Call
factorial_number()

The above program does not take any parameters and does not return anything. The output of the program is given below.

========= RESTART: C:/Python_projects/Functions/Factorial.py =============
Enter a Number to Get its Factorial: 5
The factorial is 120
>>>

In the next article, we will discuss about function with parameter with return.

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Here is a function decorator I wrote to do just that, along with an example of usage:

def IgnoreExtraArguments(f):
    import types
    c = f.func_code
    if c.co_flags & 0x04 or c.co_flags&0x08:
        raise ValueError('function already accepts optional arguments')
    newc = types.CodeType(c.co_argcount,
                   c.co_nlocals,
                   c.co_stacksize,
                   c.co_flags | 0x04 | 0x08,
                   c.co_code,
                   c.co_consts,
                   c.co_names,
                   c.co_varnames+('_ignore_args','_ignore_kwargs'),
                   c.co_filename,
                   c.co_name,
                   c.co_firstlineno,
                   c.co_lnotab,
                   c.co_freevars,
                   c.co_cellvars)
    f.func_code = newc
    return f

if __name__ == "__main__":
    def f(x,y):
        print x+y

    g = IgnoreExtraArguments(f)
    g(2,4)
    g(2,5,'banana')

    class C(object):
        @IgnoreExtraArguments
        def m(self,x,y):
            print x-y

    a=C()
    a.m(3,5)
    a.m(3,6,'apple')

Can a function have no parameters python

C#,Windows Form, WPF, LINQ, Entity Framework Examples and Codes

In Python, we can define functions to make our code reusable, more readable, and organized. This is the basic syntax of a Python function:

def<function_name>(<param1>,<param2>,...):

<code>

Tip: a function can have zero, one, or multiple parameters.

A function with no parameters has an empty pair of parentheses after its name in the function definition. For example:

defprint_pattern():

size=4

foriinrange(size):

print("*" *size)

This is the output when we call the function:

>>print_pattern()

****

You have to write an empty pair of parentheses after the name of the function to call it.

Can a function have no parameters python

Program to Compute Factorial of a Number

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