Python - Cube Root

 Code :

guess_n_check_cuberoot.py

Code :

approximate_cuberoot.py

Code :

bisection_cuberoot.py

Python-Global Variable

 

Global Variables

Variables that are created outside of a function (as in all of the examples above) are known as global variables.

Global variables can be used by everyone, both inside of functions and outside.

Code :

global_var_1.py

If you create a variable with the same name inside a function, this variable will be local, and can only be used inside the function. The global variable with the same name will remain as it was, global and with the original value.

Example

Create a variable inside a function, with the same name as the global variable

Code :

global_var_2.py

The global Keyword

Normally, when you create a variable inside a function, that variable is local, and can only be used inside that function.

To create a global variable inside a function, you can use the global keyword.

Example

If you use the global keyword, the variable belongs to the global scope:

Code :

global_var_3.py

Also, use the global keyword if you want to change a global variable inside a function.

Example

To change the value of a global variable inside a function, refer to the variable by using the global keyword:

Code :

global_var_4.py

Python-Output

 

Code :

output_1.py

Code :

output_2.py

Code :

output_3.py

Code :

output_4.py

Code :

output_5.py

Python-Loops(while/for)

Code :

whileloops.py

forloops.py

 

Python-Cond_Branching

Code :

cond_branching.py

 

Python-Output/Input

Code :

output.py

Code :

input.py

 

Python-Strings

 

Python - Data Type Match and the exit() function

 

random {randint/randrange}

 

Python - Circle Area

 

Code 

circle_area.py

Variable in Python

A variable can have a short name (like x and y) or a more descriptive name (age, carname, total_volume). Rules for Python variables:

• A variable name must start with a letter or the underscore character
• A variable name cannot start with a number
• A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ )
• Variable names are case-sensitive (age, Age and AGE are three different variables)
• A variable name cannot be any of the Python keywords.

Multi Words Variable Names

Variable names with more than one word can be difficult to read.

There are several techniques you can use to make them more readable:

Camel Case

Each word, except the first, starts with a capital letter:

myVariableName = "John"

---

Pascal Case

Each word starts with a capital letter:

MyVariableName = "John"

---

Snake Case

Each word is separated by an underscore character:

my_variable_name = "John"

Code :

legal_variable_names.py

Code :

variables_1.py

Code :

variables_2.py

Code :

variables_3.py

Code :

variables_4.py

Code :

variables_5.py

Code :

variables_6.py

Many Values to Multiple Variables

Python allows you to assign values to multiple variables in one line:

Code :

variables_7.py

One Value to Multiple Variables

And you can assign the same value to multiple variables in one line:

Code :

variables_8.py

Unpack a Collection

If you have a collection of values in a list, tuple etc. Python allows you to extract the values into variables. This is called unpacking.

Code :

variables_9.py