Python

Question

Please I don't understand topics under Function and Module in python

Answer 1

Function is a statement that takes arguments, and returns a value depending on the arguments.

In programming you can use functions to make calculations and you can also use functions to run certain pieces of code.

Here are the main parts:
~Function definition
~Function call
~Function return

Function definition:
def func_name(arg1, arg2, ... argN):
code

In Python function definition defines 3 things:
~function name: name to be used when calling the function, function names follow variable naming rules.
~parameters: comma separated variables between parentheses are parameters, which define how arguments should be passed.
~code: basic python code, that will be run when function is called.

Answer 2

Function call:
func_name(value1, value2, ... valueN)

When function name is followed by (), the function will be called. It can take arguments, (basic values, such as integers, strings, lists and booleans), how they are passed is defined by the function parameters.
When function is called, the arguments get copied to the function parameter and the parameters can be used as variables in the function code part.

Answer 3

Function call ends to a return value.
Functions can return any values using return statement in function code part.
The returned value can be any basic value, when function is called and any return statement is used, the return value will be returned to where the function was called.

Some examples:
def func():
return "Batman"
return "Ironman"

print(func())
#Output:
Batman

def func():
print("Hello world!")
return 80
print("100th time!")

print(func())
#Output:
Hello world!
80

def get_area(width, height):
return width*height

print(get_area(4, 8))
#Output:
32

If there is no return statement or no return statement is reached during the function call, then None is returned by default.

def useless_function():
pass

print(useless_function())
#Output:
None

(pass does not do anything, it's just a keyword for empty codeblocks to avoid errors.)

Answer 4

Hi. What exactly you don't understand?

Answer 5

Using Functions

Answer 6

Here's the that I Googled ant it explains the use of functions in Python.

https://www.learnpython.org/en/Functions