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Python Flow Control
- 1. Python Flow Control if…else for Loop while loop Break and continue Pass statement
- 2. if...else Decision making is required when we want to execute a code only if a certain condition is satisfied. The if…elif…else statement is used in Python for decision making. In Python, the body of the if statement is indicated by the indentation. Body starts with an indentation and the first unindented line marks the end. Python interprets non-zero values asTrue. None and 0 are interpreted as False.
- 4. Exercise – if Write a program to give a discount of 10% if the total bill amount exceeds 1000.
- 6. if...else Statement The if..else statement evaluates test expression and will execute body of if only when test condition is True. If the condition is False, body of else is executed. Indentation is used to separate the blocks.
- 8. Exercise Write a program to check if a given number is a multiple of 5.
- 9. if...elif...else The elif is short for else if. It allows us to check for multiple expressions. If the condition for if is False, it checks the condition of the next elif block and so on. If all the conditions are False, body of else is executed. Only one block among the several if...elif...else blocks is executed according to the condition. The if block can have only one else block. But it can have multiple elifblocks.
- 12. Programming Task Minimum age to Cast yourVote : 18 Minimum age to Contest an Election: 25 Given the age verify if the person can vote and can s(he) contest an election.
- 13. Exercise Write a program to check if a given year is leap year or not. Logic: if a year is not divisible by 4, its not a leap year. If a year is divisible by 4 and not divisible by 100, it’s a leap year. If a year is divisible by 4 and 100 then it should be divisible by 400 to be a leap year
- 17. Loops Loops are used in programming to repeat a specific block of code. Looping Constructs in Python ◦ while ◦ for
- 18. While loop The while loop in Python is used to iterate over a block of code as long as the test expression (condition) is true. We generally use this loop when we don't know beforehand, the number of times to iterate.
- 20. Write a program to print the number of digits of a given number using while loop.
- 22. For loop For loops iterate over a given sequence. 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.
- 24. Range Function We can generate a sequence of numbers using range() function. range(10) will generate numbers from 0 to 9 (10 numbers). To force this function to output all the items, we can use the function list().
- 25. Range function We can also define the start, stop and step size as range(start,stop,step size). step size defaults to 1 if not provided.
- 27. Exercise Write a program to calculate the factorial of a given number.
- 30. break and continue 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 statement The 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.
- 32. Exercise Write a program to check if a given number is prime or not. If a number is divisible by any number between 2 and n-1, its not prime, otherwise prime
- 34. continue statement The 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.
- 35. for loop with else A for loop can have an optional else block as well. The else part is executed if the items in the sequence used in for loop exhausts. break statement can be used to stop a for loop. In such case, the else part is ignored. Hence, a for loop's else part runs if no break occurs.
- 36. for loop with else
- 37. Nested Loop
- 38. while loop with else Same as that of for loop, we can have an optional else block with while loop as well.
- 39. Pass statement Suppose we have a loop or a function that is not implemented yet, but we want to implement it in the future. They cannot have an empty body. We use the pass statement to construct a body that does nothing.