Python Revision - Session

Variables

A variable is a name that refers to a value.
No declaration required
Variables must be assigned before being referenced.
The value stored in a variable can be accessed or updated later.
No need to specify type to a variable; Python automatically assigns.
Must begin with a letter (a - z, A - Z) or underscore (_)
Case Sensitive
Can be any (reasonable) length
There are some reserved words which you cannot use as a variable name because Python uses them for other things.

Data Types & Data Structures

Built-in data types:

Integer, Floating point, String, Boolean Values
Additional data structures:

Lists, Dictionary, Sets & Tuples

Here in the below piece of code you can see that we have assigned each variable with a particular value and use the type method we can check the datatype of the variable

integer_num = 1
floating_num = 1.3
string = 'Mike'
boolean = True

print (type(integer_num))
print (type(floating_num))
print (type(string))
print (type(boolean))

<class 'int'>
<class 'float'>
<class 'str'>
<class 'bool'>