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A constant is an identifier whose value cannot be changed throughout the execution of a program whereas the variable value keeps on changing.
There are no constants in Python, the way they exist in C and Java.
In Python, It is not possible to define constant whose value can not be changed.
In Python, Constants are usually defined on a module level and written in all capital letters with underscores separating words but remember its value can be changed.
Ex:-
PI
TOTAL
MIN_VALUE
| # A constant is a type of variable whose value cannot be changed. | |
| # constants are written in all capital letters and underscores separating the words | |
| # In reality, we don't use constants in Python. The globals or constants module is used throughout the Python programs. | |
| - constant.py | |
| PI = 3.14 | |
| GRAVITY = 9.8 | |
| - main.py | |
| import constant | |
| print(constant.PI) | |
| print(constant.GRAVITY) | |
| Rules and Naming Convention for Variables and constants | |
| # Constant and variable names should have a combination of letters in lowercase (a to z) or uppercase (A to Z) or digits (0 to 9) or an underscore (_). For example: | |
| snake_case | |
| MACRO_CASE | |
| camelCase | |
| CapWords | |
| # Create a name that makes sense. For example, vowel makes more sense than v. | |
| # If you want to create a variable name having two words, use underscore to separate them. For example: | |
| my_name | |
| current_salary | |
| # Use capital letters possible to declare a constant. For example: | |
| PI | |
| G | |
| MASS | |
| SPEED_OF_LIGHT | |
| TEMP | |
| # Never use special symbols like !, @, #, $, %, etc. | |
| # Don't start a variable name with a digit. |
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