Execute Python Syntax

As we learned in the previous page, Python syntax can be executed by writing directly in the Command Line:

>>> print("Hello, World!")
Hello, World!

Or by creating a python file on the server, using the .py file extension, and running it in the Command Line:

C:\Users\Your Name>python myfile.py

Python Indentation

Indentation refers to the spaces at the beginning of a code line.

Where in other programming languages the indentation in code is for readability only, the indentation in Python is very important.

Python uses indentation to indicate a block of code.

create a file demo_indentation.py add the below code in this file.

if 5 > 2:
  print("Five is greater than two!")

   After adding the above code in the fie  execute the code in following below manner.

C:\Users\My Name>python demo_indentation.py
Five is greater than two!

 Python will give you an error if you skip the indentation:

if 5 > 2:
print("Five is greater than two!")

Here  in the above code we will get error beacuse we are not following  indedation as show below.  

C:\Users\My Name>python demo_indentation_test.py
  File "demo_indentation_test.py", line 2
    print("Five is greater than two!")
        ^
IndentationError: expected an indented block

The number of spaces is up to you as a programmer, but it has to be at least one.

if 5 > 2:
 print("Five is greater than two!") 
if 5 > 2:
        print("Five is greater than two!") 

C:\Users\My Name>python demo_indentation2.py
Five is greater than two!
Five is greater than two!

You have to use the same number of spaces in the same block of code, otherwise Python will give you an error:

if 5 > 2:
 print("Five is greater than two!")
        print("Five is greater than two!")

Here  in the above code we will get error beacuse we are not following  proper indedation as show below.  

C:\Users\My Name>python demo_indentation2_error.py
  File "demo_indentation2_error.py", line 3
    print("Five is greater than two!")
    ^
IndentationError: unexpected indent