Python: Type() and factorials and Variables

type() :

In programming, data type is an important concept.

Variables can store data of different types, and different types can do different things.

Python has the following data types built-in by default, in these categories:

You can get the data type of any object by using the type() function:

x = 5

print(type(x))

this principle goes for the same as

x = 24

print(type(x))

Factorials :

in python there is a lot of math based methods in return allow you to return the factorial of a number but bare that in mind that this method will only work if it has positive integers. The factorial of a number is the sum of the multiplications of the whole number from the number that we specify down to 1. for example the factorial of 6 would be 6x5x4x3x2x1 = 720.

Variables :

Python has no command for declaring a variable, A variable is created the moment you first assign a value to it. 

Variables do not need to be declared with any particular type, and can even change type after they have been set.

Example :

x = 20      # x is of type int

x = "Oakley" # x is now of type str

print(x)

Casting :

If you want to specify the data type of a variable, this can be done with casting.

Example: 

x = str(7)    # x will be '7'

y = int(7)    # y will be 7

z = float(7)  # z will be 7.0

A variable can have a short name (like x and y) or a more descriptive name (age, car name, 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)

Example :

myvar = "Oakley"

my_var = "Oakley"

_my_var = "Oakley"

myVar = "Oakley"

MYVAR = "Oakley"

myvar2 = "Oakley"

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 = "Oakley"

Pascal Case; 

Each word starts with a capital letter:

MyVariableName = "Oakley"

Snake Case ; 

Each word is separated by an underscore character:

my_variable_name = "Oakley"

Multiple Variables :

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

Example

x, y, z = "Orange", "Banana", "Cherry"

print(x)

print(y)

print(z)