Python doesn't adopt statement terminators, and code blocks are specified through indentation. Statements that expect an indentation level must end in a colon (:). This leads to the following:

• The Python code is clearer and more readable.
• The program structure always coincides with that of the indentation.
• The style of indentation is uniform in any listing.

Bad indentation can lead to errors.

The following example shows how to use the if construct:

print("first print")
if condition:
    print(“second print”)
print(“third print”)

In this example, we can see the following:

• The following statements: print("first print"), if condition:, print("third print") have the same indentation level and are always executed.
• After the if statement, there is a block of code with a higher indentation level, which includes the print ("second print") statement.
• If the condition of if is true, then the print ("second print") statement is executed.
• If the condition of if is false, then the print ("second print") statement is not executed.

It is, therefore, very important to pay attention to indentation because it is always evaluated in the program parsing process.