Basic Concepts of Python Programming

There are Five Important basic concepts of python. These five are called as tokens.

• Identifiers
• Keywords
• Operators
• Delimiters
• Literals

Identifiers or Variables

An identifier or variables are used to identify a variable, functions, objects, and class. You can easily understand variables as variable = vary + able vary means change and able means it happens. variables can be changed from person to person. for example,

• name=input(“Enter your name”) # name is variable
• age=int(input(“Enter your age”)) #age is variable

If you want a name means you give name as a variable and if you want age means you give age as a variable. but Keywords are not used for variables. we can see keywords in the next topic.

Some important rule to write identifiers

• An Identifiers must start with alphabet (A to Z or a to z) and underscore( _ )
• It does not allow punctuation character such as %,$, @, etc.,
• Identifiers must not be a python keyword.

Valid and Invalid Identifiers

1. Reg_no – Valid Identifier
2. name&name – Invalid Identifier
3. num1 – Valid Identifier
4. 1num – Invalid Identifier

Keywords

Keywords are special or reversed words. It already built-in by a python interpreter for doing some specific tasks. Keywords are not used for any other purpose. Examples for keywords are, if, else, def, in, class, for, while, and, return, etc.

Operators

There are various types of Operations,

• Arithmetic Operator
• Logical Operator
• Relational Operator
• Assignment Operator
• Bitwise Operator
• Conditional Operator
• Membership Operator
• Identity Operator

An operator is a huge concept. so, I cover the content in the next new post. Let move on

Delimiters or Punctuation

Python uses symbols in various fields such as list, tuple, dictionary, etc.

Literals or Constant

Literals are three types. They are,

• Numeric
• Strings
• Boolean

Numeric

Numeric Literals consist of digits and are immutable (unchangeable). Numeric literals
can be classification into 3 types,

• Integer – Whole number
• float – Decimal number
• complex – 1 + 3.14 j

Strings

In Python, a string literal is a sequence of characters surrounded by quotes. Python
supports single, double, and triple quotes for a string. A character literal is a single character surrounded by single or double-quotes. The value with triple-quote “‘ ‘” is used to give multi-
line string literal.

• “Single Line Strings”
• “‘ This is for multiline strings “‘

Boolean

A Boolean literal can have either True or False.

• True – Condition is satisfied based on condition
• False – Condition is not satisfied based on condition

My Previous Post

Core Parts of Python: https://iterathon.tech//core-parts-of-python-idle-input-and-output/

Core Parts Of Python IDLE | Input() And Output()

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