Python

What is Python?

Python is an interpreted high-level general-purpose programming language. Its design philosophy emphasizes code readability with its use of significant indentation [i].
Getting started with Python is easier as compared to that of other programming languages like Java. Python has a lot of predefined libraries which makes it hot favorite for Machine Learning/ Deep Learning like cutting edge technologies.

Keyword in Python ?

. Keyword in Python are basically words that have special meaning.

import keyword
keyword.kwlist

Output: ['False', 'None', 'True', 'and', 'as', 'assert', 'async', 'await', 'break', 'class', 'continue', 'def', 'del', 'elif', 'else', 'except', 'finally', 'for', 'from', 'global', 'if', 'import', 'in', 'is', 'lambda', 'nonlocal', 'not', 'or', 'pass', 'raise', 'return', 'try', 'while', 'with', 'yield']

len(keyword.kwlist)

Output: 35

In total we have 35 keyword in Python.

Variables in Python ?

Variable acts as a container in Python to store value. Variable acts as a place holder to hold value which we can use just by referencing the variable name.
There are rules which should be followed while naming the variable and they are:

1. Variable name should always start either with a letter or underscore.
   

   firstnum = 10

   No error occurred

   _firstnum = 11

   No error occurred when we define variable with start with _

   1firstnum = 12

   File "", line 1
   1firstnum = 12
   ^
   SyntaxError: invalid syntax
   Syntax error occurred when we start defining variable with start with number.

   $firstnum = 13

   File "", line 1
   $firstnum = 13
   ^
   SyntaxError: invalid syntax
   Syntax error occurred when we start defining variable that starts with special character.

2. Keyword cannot be used to define variable name.

   if = 2

   File "", line 1
   if = 2
   ^
   SyntaxError: invalid syntax

3. Keyword cannot contain special symbol.

   ar$a = 1

   File "", line 1
   ar$a = 1
   ^
   SyntaxError: invalid syntax

4. Keyword in python are case-sensitive.

   a = 10
   A = 11
   a

   Output:10

   A

   Output: 11

Identifiers in Python ?

A Python identifier is a name used to identify a variable, function, class, module or other object.

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