Python Selection Logic

Selection is an important concept to learn, it allows you to add logic into your program. In Python selections are constructed by using quotif statementsquot. This tutorial will provide the essential knowledge required to add selection into your Python programs.

In Python, decisions are made with the if statement, also known as the selection statement. When processing an if statement, the computer first evaluates some criterion or condition. If it is met, the specified action is performed. Python has another way to write a selection in a program - the conditional operator.

You need to be a little careful about how you speak about what's evaluated. For example, in output ynp.logical_andx gt 1, x lt 5, x lt 5 is evaluated possibly creating an enormous array, even though it's the second argument, because that evaluation happens outside of the function. IOW, logical_and gets passed two already-evaluated arguments. This is different from the usual case of a and

Starting Out with Python Chapter 3, Decision Structures and Boolean Logic. Objectives This lesson covers methods to make choices in programs. Objectives important to this lesson Selection - Sometimes the next thing to do in a program is determined by a user's choice, or the value of a variable. When

Selection Statements Selection Statements. Selection statements are used in programming to select particular blocks of code to run based on a logical condition. The primary selection statements in Python are if else elif try except So far in this text, all of the Python code has either been strictly linear or linear and include functions.

For selection close selection A decision within a computer program when the program decides to move on based on the results of an event., Python close Python A high-level programming language

Selection to allow decisions to be made and Iteration to loop or repeat our instructions as many times as we need. Congratulations! You have just learned the 3 elements that all programming languages must support and you wrote a simple program in one of the most complex programming languages used today, C.

In Python, the selection statements are also known as decision making statements or branching statements. The selection statements are used to select a part of the program to be executed based on a condition. Python provides the following selection statements. if statement if-else statement if-elif statement if statement in Python

Types of Selection Statements. Python supports four main types of selection statements if Statement Executes a block of code if the given condition is True. if-else Statement Executes one block of code if the condition is True and another block if it is False. if-elif-else Statement Allows testing multiple conditions in a sequence. Nested if Statement An if statement inside another if

There are a few rules to point out regarding the syntax of selection statements. The conditional keywords are if, elif, and else.. if - begins an quotifquot block elif - same as quotelse ifquot pythons way of saying quotif the previous conditions were not true, then try this conditionquot