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!
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.
Python will give you an error if you skip the indentation:
The number of spaces is up to you as a programmer, the most common use is four, but it has to be at least one.
Example
1234
if 5 > 2: print("Five is greater than two!") if 5 > 2: print("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:
Example
Syntax Error:
123
if 5 > 2: print("Five is greater than two!") print("Five is greater than two!")
In Python, variables are created when you assign a value to it:
Python has no command for declaring a variable.
You will learn more about variables in the Python Variables chapter.
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:
