PYTHON JOURNEY BY BEGINNER

Variable and Type conversion

Think of variable like:- 

a storage for a single item storage.

you can store 1 / value in a variable.

eg

name= "Dfocmaru"

here you can assume name is the box and "Dfocmaru" is the item 

there are certain conditions for variable to be a variable

first of all

it should not be in str: ""

"" cause if its in quotation it automatically becomes string

a= "d4"  is correct

"a"="d4" is incorrect

the 2nd condition is:- you can't start variable name with numbers or symbols (#$%^&*)

any special symbols ain't working

1N="D4" is wrong

but 

N1="D4" is correct

@N="ZEN" is wrong

N@="ZEN" is also wrong

3rd condition:- Underscore (_) is an exception:

_name="dfocmaru" is correct

name_2="d4" is also correct

HOPE YOU ALL Understand

Now we all are gonna go to type conversion

Type Conversion is just changing type of variable.


lets say

when user types the input its usally in string format.

with type conversion you can change the string to int and so on but. the input has to respect the boundaries of each datatypes.

You cannot just change 

a="HELLO WORLD"

to

print(int(a))

thats a recipe for disaster

what youc an do it 

if 

a="123"

to

print (int(a))

this will change to integar.

but whats the point of this?

Its simple really 

lets say in basic math 

when user gives input its usally in string

so when you ask using inpu

a=input("Put a number here") user typed:- 69

This basically saying "69" which is a string

so you can't say

print (a+67). it will give type error

however 

print(int(a)+67) is valid

and you can't add string with an integar

so we use type conversion.