Execute Python Syntax
As we learned in the earlier lesson, 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.pyPython 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!")Python will give you an error if you skip the indentation:
Example
if 5 > 2:
print("Five is greater than two!")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
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
if 5 > 2:
print("Five is greater than two!")
print("Five is greater than
two!")Python Variables
Example
x = 5
y = "Hello, World!"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.
Example
#This is a comment.
print("Hello, World!")