Python main function. Main function is the entry point of any program. But python interpreter executes the source file code sequentially and doesn't call any method if it's not part of the code. But if it's directly part of the code then it will be executed when the file is imported as a module.

1. Python Functions

2. Table of Contents
• What is a function in Python?
• Syntax of Function
• Example of a function
• How to call a function in python?
• Docstring
• The return statement
• Syntax of return
• Example of return
• How Function works in Python?
• Scope and Lifetime of variables
• Types of Functions

3. What is a function in Python?
• Python, work is a group of private sector executives.
• Help with exercise to break into smaller and similar
programs. As our program has grown a lot, the job
creates a more manageable system.
• In addition, repairs are avoided and make them
recyclable.
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4. Syntax of Function
def function_name(parameters):
"""docstring"""
statement(s)
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5. The definition of the definition above is shown in
the following sections.
1. The key word of the TKR is a sign of the beginning of
a leader.
2. Name of activity to identify inappropriately. The name
of the job is the same as Python's writings.
3. A guide (a reason) used for the cost of performance.
They prefer.
4. Time (:) to show the end of the leader.
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6. Example of a function:
def greet(name):
"""This function greets to
the person passed in as
parameter"""
print("Hello, " + name + ". Good morning!")
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7. How to call a function in python?
When we have a specific task, we can call other programs
or even call Python. To call the action you have to write
the name of the job, according to the boundaries.
>>> greet('Paul')
Hello, Paul. Good morning!
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8. Docstring:
• The first presidential chain of chain of documents and
chains of chains. It is used to describe a few words, what's
working at the wedding.
• While selecting, the documents are a good program. Apart
from where to find it was the first night, always write your
number.
For example:
Try to keep the bottom of the waste, Python watching out.
>>> print(greet.__doc__)
This function greets to
the person passed into the
name parameter

9. The return statement:
After this, it is used to leave the work and return to the
place known.
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10. Syntax of return:
return [expression_list]
This text may include quantitative expressions and return
values. If there are no details on the identification or proof
it is not working, then the task will return to the item.
For example:
>>> print(greet("May"))
Hello, May. Good morning!
None
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11. Example of return:
def absolute_value(num):
"""This function returns the absolute
value of the entered number"""
if num >= 0:
return num
else:
return -num
# Output: 2
print(absolute_value(2))
# Output: 4
print(absolute_value(-4))

12. How Function works in Python?

13. Scope and Lifetime of variables:
• The size of a part of the program depends on the
known changes. Articles and trends are defined in an
unprecedented act. Therefore, they have a place to live.
• A period of change in your life using a set of variables.
Changing the life of the task during the operation is
carried out.
• When it is broken, let's go back to the action.
Therefore, the action does not tell the cost of the old
call.

14. Below is an example showing the effectiveness of the
work.
def my_func():
x = 10
print("Value inside function:",x)
x = 20
my_func()
print("Value outside function:",x)
Output:
Value inside function: 10
Value outside function: 20

15. Types of Functions:
• Basically, we can divide up two types of the following
activities:
• 1. Build up activities - jobs built for Python.
• 2. Operations defined in the user - activity defined in
the user.

16. Thank u
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