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      Course
      Decision Making

      Python Tutorial

      This Python tutorial has been written for the beginners to help them understand the basic to advanced concepts of Python Programming Language. After completing this tutorial, you will find yourself at a great level of expertise in Python, from where you can take yourself to the next levels to become a world class Software Engineer.

      Decision Making

      Python's decision making functionality is in its keywords − if..elif...else. The if keyword requires a boolean expression, followed by colon (:) symbol. The colon (:) symbol starts an indented block. The statements with the same level of indentation are executed if the boolean expression in if statement is True. If the expression is not True (False), the interpreter bypasses the indented block and proceeds to execute statements at earlier indentation level.
      Decision structures evaluate multiple expressions which produce TRUE or FALSE as outcome. You need to determine which action to take and which statements to execute if outcome is TRUE or FALSE otherwise.
      Following is the general form of a typical decision making structure found in most of the programming languages
      
      Python programming language assumes any non-zero and non-null values as TRUE, and if it is either zero or null, then it is assumed as FALSE value.
      Python programming language provides following types of decision making statements. Click the following links to check their detail.
      Sr.No.
      Statement & Description
      1
      if statements
      An if statement consists of a boolean expression followed by one or more statements.
      2
      if...else statements
      An if statement can be followed by an optional else statement, which executes when the boolean expression is FALSE.
      3
      nested if statements
      You can use one if or else if statement inside another if or else if statement(s).
      Let us go through each decision making briefly −

      Single Statement Suites

      If the suite of an if clause consists only of a single line, it may go on the same line as the header statement.
      Here is an example of a one-line if clause
      #!/usr/bin/python
      
      var = 100
      if ( var == 100 ) : print ("Value of expression is 100")
      print ("Good bye!")
      When the above code is executed, it produces the following result
      Value of expression is 100
      Good bye!

      Practice with Online Editor

      Note: This Python online Editor is a Python interpreter written in Rust, RustPython may not fully support all Python standard libraries and third-party libraries yet.
      Remember to save code(Ctrl + S Or Command + S) before run it.