You know that variable is a memory space ant it contains a value. When we talk in low level that's a binary number. When we examine the variable or when we use it. Let's get it clearly. A variable is a temporary storage that can hold a string , integer or a float value etc. You know that string is an array of characters while integer can hold number. A float can contain a floating point number. Hear I wrote a simple python script to demonstrate the usage of variables.
Thilan@ubuntu:~/programming$ cat tmp1.py
#!/usr/bin/env python 
x = 3 
print (x) 
print (x +3)
x = 5
print (x) 
x = 3 * 4 
print (x)
Thilan@ubuntu:~/programming$ python tmp1.py
3
6
5
12
Thilan@ubuntu:~/programming$
First I declared a variable names x and assigned a value 3 to it. Note that we have used equal sign for this but it doesn't mean x is equal to 3. We just use x as a container for value 3. Now there is another point to note about. If you divide two integers the answer also be an integer. Even it has a floating point numbers they will be dropped and only integer value will be returned.
Thilan@ubuntu:~/programming$ cat tmp1.py
#!/usr/bin/env python
x = 12
y = 5
print (x/y)

Thilan@ubuntu:~/programming$ python tmp1.py
2
So if we want correct answer we want to use floats instead integers. We can use float() function to convert integers to floating point numbers. Thilan@ubuntu:~/programming$ cat tmp1.py #!/usr/bin/env python x = float(12) y =float(5) print (x/y) Thilan@ubuntu:~/programming$ python tmp1.py 2.4
Thilan@ubuntu:~/programming$ cat tmp1.py
#!/usr/bin/env python 
x = float(12)
y =float(5)
print (x/y)

Thilan@ubuntu:~/programming$ python tmp1.py
2.4
Thilan@ubuntu:~/programming$
I have allocated complete tutorial for discuss about strings. So I don't go to discus them hear. Thanks for reading. :-)