Python beginner tutorial introduction

Python is an easy to understand high-level programming language. If you want to switch programming language or learn your first programming language python is the way to go.

Why python

fewer lines of codes as compared to other languages
beginner friendly(easy to understand)
used in many domains like web development, machine learning, data science, deep learning and many more

Getting started

Python installation is a bit different for different operating system. You can go to python.org/downloads and easily install latest or a suitable version of python. Also, you can use whatever text editor you like it does not matter.

Lets code

Writing hello world in python is super easy

>>>print("hello world")
hello world

Variables

Variables in python can be assigned by assigning a value to it.

>>>x = 5
>>>y = "hey"
>>>print(x)
5
>>>print(y)
hey

Indentation, comments and case sensitivity

Before we learn anything else we should know above mentioned things

Comments:

To comment a code or anything put a # before it like

# this is a comment

Indentation:

In other languages indentation is to make code look good and aesthetic but in python it will throw error without proper indentation.

>>>if x>y:
           print(y)

Case Sensitive:

Python is a case sensitive language i.e. Aaaa and AAaa are two different things.

Data types in python

There are four built in collection data types in python(arrays):

Lists
Tuples
Sets
Dictionaries

Lists and Tuples

Lists and tuples are built in collection data types in python with a difference that tuples are immutable and lists are not. It means that content of a list can be changed once it's made which is not the case with tuples.

>>>list = ["a", "b", "b", 1]
>>>tuple = ("a", "a", 4, "c")

Lists are very useful as they can be use as arrays, stacks or queue.

Loops

for loop

for loop is used for iteration.

>>>pet_list = ("dog", "cat", "hamster")
>>>for pet in pet_list:
           print(pet)
dog
cat
hamster

In the above code we iterated through a list using for loop

while loop

while loop is used when we want to perform a command as long as a condition is true.

>>>a = 0
>>>while a<3:
           a+=1
           print(hey)
hey
hey
hey

Sets and dictionaries

Set

It is one of the four built in collection data types in python. It does not allow duplicates.

set= {"item1", "item2", "item3"}

Dictionaries

Like sets, dictionaries also don't allow duplicates. They store data in key-value pairs.

dict = {"name": "bob", "age": 25, "weight": 80 }

dictionaries can also be used to make hash-map data structure

In this tutorial we just got introduced with basic syntax of python programming language. In coming blogs we will learn python conditions, classes and take a deep dive in contents of this blog.

Python Tutorial(Part-1)-Introduction