Sequence Types

All sequence types support len function
Sequence types support slicing start-index:stop-index:step
- start-index: default value is 0
- stop-index: default value is length
- step: it has default value of 1
Refer Here for data types
Sequence types:
- list
- tuple
- range: it is used to create sequences
list:
- can hold multiple types
- is mutable
- syntax: []
tuple:
- can hold multiple types
- are immutable
- syntax: ()
We can convert between list and tuple
We can loop through lists, tuple using while
For loop in python Refer Here

for item in items:
    print(item)

Refer Here for jupyter notebook

Modules and Functions

One of the major principle in programming in Reusability which revolves around DRY principle (Dont Repeat yourself)
Module is a python file
Function is a reusable code which exists in a module
modules can be reused or functions, classes or variables in module can be reused
To document modules and functions lets use docstrings, Lets use Google’s style guide for this
Docstring for a module
Docstring for function and methods
Functions
To name a function we use snake casing
Module can be used in two ways
- executor:
  - we are executing the module python <module-name>.py
- library:
  - other module imports and calls the reusable functions (or classes or variable)
Module import options
option 1: import

import utils

if utils.is_even(10):
    print("even")

from utils import is_even

if is_even(10):
    print("even")

Whenever you see anything in python with double underscores (dunder) around it, it has special purpose and is defined by python.
Lets discuss about a special dunder variable __name__ which will have two possible values
- __main__ when the module is executed directly
- module-name when module is imported