Comparators

Operators

Operator	Description
==	Equal to
>	Greater then
>=	Greter than or equal
<	Less then
<=	Less then or equal
!=	Not equal

Example

#!/usr/bin/env python3

age = 99

if age <= 35:
    print('You are old enough to be a Representative, Senator, or the President.')
elif age >= 30:
    print('You are old enough to be a Senator.')
elif age >= 25:
    print('You are old enough to be a Representative.')
else:
    print('You are not old enough to be a Representativen Senator or the President.')

print('Have a nice day!')

Result :

You are old enough to be a Senator.
Have a nice day!

Boolean Operators

Operator	Description
and	Evalutates to True if both statements are true, otherwiser evaluates to False.
or	Evaluates to True if either of the statements is true, otherwise evaluates to False.
not	Evaluates to the opposite of the statement.

Numbers

How to work betwen numbers variables ?

For example, we gona talking about age

age = 18

So tu use age into operators, you have to format the age var using int

int(age)

Python Tips

If you need to use the age var along your script convert this var to an interger

age = 18 # or age = input('Tell me your age please? ')
age = int(age)

Functions

Mindset of functions :

1. Don't Repeat Yourselft
2. Write one tim, use many times

Example of function code block

def function_name():
    # code block

as

def say_hi():
    print('Hi!')

To run any function, just have to call it like :

def say_hi():
    print('Hi!')

say_hi() # < run the function say_hi

Warning

Keep inmind that any function must be defined before to be next called

Parameters

Example of parameters using def function

# functions
def say_hi(name):
    print('Hi {}!'.format(name))

# vars
name = input('Fill your name: ')

# run functions
say_hi('Toto')
say_hi('Peoples')
say_hi(name)

Result :

Fill your name: Toto
Hi Toto!
Hi Peoples!
Hi Sam!

Default value

In case that the parameter is missing, we can suggest default value parameters

def say_hi(name = 'there'):
    print('Hi {}!'.format(name))

say_hi()
say_hi('Toto')

Result:

Hi there!
Hi Toto!

Example of more complexe parameters.

Both of them are named as 'Doe' by default :

def say_hi(first, last = 'Doe'):
    print('Hi {} {}!'.format(first, last))

say_hi (last = 'Doe', first = 'Jane')
say_hi (first = 'John')
say_hi('Janie', 'Doe')
say_hi('Johnny')

Result:

Hi Jane Doe!
Hi John Doe!
Hi Janie Doe!
Hi Johnny Doe!

Returning data

Into your function, it could be clever to add like comment as :

"""Def function usage/utility"""

def say_hi(first, last = 'Doe'):
    """Say Hi using firstname and lastname when default one isn't used"""
    print('Hi {} {}!'.format(first, last))

Example of returning satus True or False

def true_or_false(number):
    """Determine if a number is true or false."""

    if number % 2 == 0:
        return True
    else: 
        return False

print(true_or_false(7))

In this case

False

Use multiple functions nested

#!/usr/env/bin python3

# define functions
def get_name():
    firstname = input("What's U'r firstname ? ")
    lastname = input("What's U'r lastname ? ")
    return firstname
    return lastname

def say_name(firstname, lastname = 'Doe'):
    print("U'r name is {} {}.".format(firstname, lastname))
    print("Yes I know I'm mentalist.")

def get_and_say_name():
    """Get and display name"""
    Identity = get_name()
    say_name(Identity)

# run function.s
get_and_say_name()

Result :

What's U'r firstname ? Sam
What's U'r lastname ? 
U'r name is Toto Doe.
Yes I know I'm mentalist