python-selection-statements

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​Selection conditional statements

Chapter 4 - section 1​

​Objectives

if - statement

if - else statement

if - elif statement​

​define and use

selection control structure

​define

​Lets start with a revison

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control structure means

• step by step code running

• the flow of the code in the program

• decision and branching code

• controlling the code

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Conditional statements are expressions that result in either a yes or No

• true

• false

• not sure

• I dont remember

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The number or word we give to a variable

• Value
• Bug
• Information
• Text

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What is the word (command) used to display numbers and text on the screen?

• print
• input
• output
• command

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Relational operators is like:

• >

• OR

• =

• AND

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Not a Relational operators :

• =

• <=

• >

• ==

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Using the variables

Lexus_XR = 4500 and Tesla = 5200 in Python,

this expression :

Lexus_XR >= Tesla

will be

• False

• True

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equal relational operator

• =

• !=

• ==

​in python we use

if Statements

​for decision making

​selection means using statements (rules) that is used for decision making

​in python we use

if Statements

​for decision making

​condition is used in our everyday life

​For example

Traffic lights are an example of conditional statements. Since the red light means stop and the green light means to move.

​can you give other examples??

​

​

​The if statement

​The if statement is used together with conditional statements

to decide whether to run a code block or skip it.

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if statement is used together with ------------ in order to work correctly

• control statement

• input function

• conditional statement

• print function

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what will be the output of the shown code?

• see you tomorrow

• you should stay and attend classes

• error

• nothing

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what is the output

• the weather still hot

• its not hot any more

• the weather still hot

  its not hot any more

• temp = 30

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the if statement will ------the block of code ( in line 4 )

• execute ( run )

• skip ( not run )

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line 4 in this code will be

• skipped

• executed

• error

• nothing

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line 4 in this code will be skipped because

• time is > 8

• the condition of if is false

• there is an error in the code

• time must = 8

​how to fix this ? >>>>>>>>

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so if you are coding one selection or one option

then its better to use ?

• if

  statement

• if - else

  statement

• if - elif - else

  statement

• sequencing

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and if you are coding two selections or two options

then its better to use ?

• if

  statement

• if - else

  statement

• if - elif - else

  statement

• sequencing

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but if they are more then two selections or options

then its better to use ?

• if

  statement

• if - else

  statement

• if - elif - else

  statement

• sequencing

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if no selections or no repeating you will use ---- coding

• if

  statement

• if - else

  statement

• if - elif - else

  statement

• sequencing

Open Ended

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