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Python Programming - Control Flow
This document summarizes control flow statements in Python including sequential execution, conditional execution with if/else statements, and repetitive execution with while and for loops. It provides examples of if, elif, nested if, while, and for statements. It also discusses breaking and continuing loops using break and continue statements.
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Python Programming - Control Flow
- 1. CS.QIAU - Winter2020 PYTHONControl Flow - Session 2 Omid AmirGhiasvand Programming
- 2. Control Flow Statements/Structure ▸Python supports a set of control flow statements that you can integrate into your program ▸ Sequential ▸ Line by line from top to bottom execution of statement in the same order they appear in the program ▸ Decision ▸ Allows conditionally execute or not execute a block of code. ▸ Loop ▸ Allow the execution of a block of statement multiple time. Condition/if Statement Repetition/ Iteration Statement
- 3. If Control FlowStatement if boolean_expression : statement-1 statement-2 statement-3 else : statement-4 keyword block of Code colon keyword another block
- 4. None is a specialvalue and also a data typeboolean expression
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- 6. check the string ifit contain a number now we can cast to int remove the str & see what will happen remove return & see what will happen
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- 9. ▸ We canas many as elif we want. If Control Flow Statement if boolean_expression-1 : statement-1 statement-2 elif boolean_expression-2 : statement-3 statement-4 elif boolean_expression-3 : statement-5 else : statement-6 keyword
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- 13. Nested if Statements ▸We can place an if statement inside another if statement. if boolean_expression-1 : if boolean_expression-2 statement-1 else statement-2 elif boolean_expression-3 : statement-3 else : statement-4 will match the closest if
- 14. match to closest ifstatement
- 15. while boolean_expresion : statement-1 statement-2 statement-3 WhileControl Flow Statement block of Code keyword colon iterate while True
- 16. a boolean expression while continue untiluser enter a number a number entered
- 17. what happened!? 17 isa number! isn’t it ?
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- 20. update loop control variableinside the loop body
- 22. For Control FlowStatement for iteration_variable in sequence: statement-1 statement-2 statement-3 Block of Code keyword Colon sequence of items keyworditem
- 23. range is abuilt- in function remove end=‘, ‘ and see what will happen
- 24. super easy programbut the details are always important you can write this program in 100 ways here we did not check user input. but we have to!
- 25. Break and Continue ▸If you wand to loop until something occurs, but you’re not sure when that might happen, you can use an infinite loop with a break statement. ▸ If you don’t want to break out of a loop but just want to skip ahead to the next iteration for some reason you can use continue statement.
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- 28. “The Unexamined LifeIs Not Worth Living”