Python: variables in python

What is Variable?

• A variable is simply a name that one creates to store something  for later use.

Variable names in python follow the rules:

• Upper and lower case letters and numbers are allowed, no symbols except underscore symbol( _ ). 

• Variable names must start with a letter or _ symbol.

• Variable names are case sensitive (MyVar and myvar are different)

• The length of the variable name is limited.

• You cannot use python special words/keywords as variable names.

A value associated with a variable by using = (Equal) operator.

No declaration is needed for what type of values is stored.

Example1:

Variable1=10

print(Variable1)

Output:

10

Example2:

vaRiaBle2=20

print(vaRiaBle2)

Output:

20

Example3:

x=2

Y=4

XYZ=5

abc=7

print(x)

print(Y)

print(XYZ)

print(abc)

Output:

2

4

5

7

Example4:

a_b=10

print(a_b)

_ab=20

print(_ab)

Output:

10

20

Example5:

var@3=30

print(var@3)

Error will be displayed

Example6:

myvar=10

print(myvar)

print(MyVar)

Output:

10

Traceback (most recent call last):

  File "E:/python_practice/variables.py", line 29, in <module>

    print(MyVar)

NameError: name 'MyVar' is not defined

Example7:

and=20

print(and)

Output:

invalid syntax