Python Syntax

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

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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.

  Example

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

  Try it Yourself »

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

  Example

   Syntax Error:

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

   Try it Yourself »

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

  Example

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

  Try it Yourself »

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

  Example

  Syntax Error:

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

  Try it Yourself »

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Python Variables

In Python, variables are created when you assign a value to it:

  Example

  Variables in Python:

x = 5
y = "Hello, World!"

  Try it Yourself »

  Example

  Comments in Python:

#This is a comment.print("Hello, World!")

  Try it Yourself »

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Test Yourself With Exercises

Exercise:

Insert the missing part of the code below to output "Hello World".

("Hello World")