Flash cards
Review the key moves
What is the main idea behind Python Syntax?
Lesson checks
Practice each idea before moving on
Short Mimo-style checks built from this lesson's code, terms, and sequence.
Which statement best captures the main point of this lesson?
Complete the missing token from the example code.
>>> ___("Hello, World!")Put the learning moves in the order that makes the concept easiest to apply.
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!")