Python Syntax

Vipin | Sun, 07 Jun, 2020 | 247

Executing Python Syntax

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

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

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

C:\Users\VIPIN\Desktop\selfcode>python helloworld.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.

Example

if 10 > 5:
  print("Ten is greater than Five!")
  • Python will give you an error if you skip the indentation:

Example

Syntax Error:

if 10 > 5:
print("Ten is greater than Five!")

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

Generally indenetation is decided using four spaces.

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!")

Python Variables

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

#Example
#Variables in Python:

x = 5
y = "Hello, World!"

 

Python has no command for declaring a variable.


Comments

Python has commenting capability for the purpose of in-code documentation.

Comments start with a #, and Python will render the rest of the line as a comment:

Example

Comments in Python:

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

Mulitline comment are enclosed in ''' '''

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