Python Flow Control
- 1. Python Flow Control Python if...else Python for Loop Python while Loop Python break and continue Python Pass
- 2. Python if...else • What are if statement in Python? • Python if Statement Syntax • Python if Statement Flowchart • Example: Python if Statement • Python if...else Statement • Syntax of if...else • Python if..else Flowchart • Example of if...else • Python if...elif...else Statement • Syntax of if...elif...else • Flowchart of if...elif...else • Example of if...elif...else • Python Nested if statements
- 3. Python if Statement Syntax • Syntax
- 4. Python if Statement Flowchart
- 5. Example:
- 6. Output
- 7. Syntax of if...else • Syntax
- 10. Output
- 11. Syntax of if...elif...else • Syntax
- 14. Output
- 15. Python Nested if statements
- 16. Output
- 17. Python for Loop • What is for loop in Python? • Syntax of for Loop • Flowchart of for loop • Example: Python for Loop • The range() function • for loop with else
- 18. What is for loop in Python? • Is used to iterate over a sequence (list, tuple, string) or other iterable objects • Iterating over a sequence is called traversal
- 19. • Syntax of for Loop: • Here, val is the variable that takes the value of the item inside the sequence on each iteration • Loop continues until we reach the last item in the sequence. The body of for loop is separated from the rest of the code using indentation.
- 20. Flowchart of for Loop
- 21. Example
- 23. The range() function • Can generate a sequence of numbers using range() function • range(10) will generate numbers from 0 to 9 (10 numbers) • Can also define the start, stop and step size as range(start,stop,stepsize) • Step size defaults to 1 if not provided. • Does not store all the values in memory, it would be inefficient • So it remembers the start, stop, step size and generates the next number on the go
- 24. Example
- 26. for loop with else
- 27. Python while Loop • What is while loop in Python? • Syntax of while Loop in Python • Flowchart of while loop • Example: Python while Loop • while loop with else
- 28. What is while loop in Python? • Is used to iterate over a block of code as long as the test expression (condition) is true • Generally this loop is used when we don't know beforehand, the number of times to iterate
- 29. Syntax of while Loop in Python • Python interprets any non-zero value as True. None and 0 are interpreted as False.
- 30. Flowchart of while Loop
- 31. Example
- 33. while loop with else
- 35. Python break and continue • What is the use of break and continue in Python? • Python break statement • Syntax of break • Flowchart of break • Example of break • Python continue statement • Syntax of Continue • Flowchart of continue • Example: Python continue
- 36. What is the use of break and continue in Python? • break and continue statements can alter the flow of a normal loop • Loops iterate over a block of code until test expression is false, but sometimes we wish to terminate the current iteration or even the whole loop without checking test expression • break and continue statements are used in these cases
- 37. Python break statement • Terminates the loop containing it • Control of the program flows to the statement immediately after the body of the loop. • If break statement is inside a nested loop (loop inside another loop), break will terminate the innermost loop • Syntax of break
- 39. Example
- 41. Python continue statement • Is used to skip the rest of the code inside a loop for the current iteration only • Loop does not terminate but continues on with the next iteration • Syntax of Continue
- 43. Example
- 45. Python pass statement • What is pass statement in Python? • Syntax of pass • Example: pass Statement
- 46. What is pass statement in Python? • pass is a null statement • The difference between a comment and pass statement in Python is that, while the interpreter ignores a comment entirely, pass is not ignored • However, nothing happens when pass is executed • It results into no operation (NOP) • Syntax of pass
- 47. Example
- 48. Example
- 49. Thank You !