Python Programming | JNTUA | UNIT 3 | Updating Variables & Iteration |
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This document contains summaries of two lectures on updating variables and iteration in Python programming. Lecture 17 discusses reassignment of variables to new values and updating variable values based on their previous values. Lecture 18 introduces for and while loops for automating repetitive tasks, the break keyword to terminate loops, and calculating square roots through iterative approximation. The document provides examples of reassigning variable values, updating variables, using for and while loops, and computing square roots with the iterative formula.
Python Programming | JNTUA | UNIT 3 | Updating Variables & Iteration |
- 1. Python Programming Unit – III (Part I) (Lecture 17) Updating variables & Iteration
- 2. Python Programming Unit – III (Part I) (Lecture 17) Updating variables & Iteration Reassignment Updating variables
- 3. Updating variables & Iteration Lecture 17 Lecture 18 Reassignment Updating variables Break Square roots for & while statement
- 4. Lecture 17 Reassignment Updating variables Updating variables
- 5. • More than one assignment to the same variable. • A new assignment makes an existing variable refer to a new value (and stop referring to the old value) Reassignment a = 5 Print (a) is 5 a = 6 Print (a) is 6
- 6. Lecture 17 Reassignment Updating variables Updating variables
- 7. Updating variables • The new value of the variable depends on the old. x = x + 1 • Get the current value of x, add one, and then update x with the new value. • Before you can update a variable, you have to initialize it, usually with a simple assignment: x = 5 x = x+1
- 8. Lecture 17 Reassignment Updating variables Updating variables
- 9. Python Programming Unit – III (Part I) (Lecture 18) Updating variables & Iteration
- 10. for & while statement Python Programming Unit – III (Part I) (Lecture 18) Updating variables & Iteration Break Square roots
- 11. Lecture 17 Lecture 18 Reassignment Updating variables Break Square roots for & while statement Updating variables & Iteration
- 12. Iteration Lecture 18 Break Square roots for & while statement
- 13. for & while statement • Computers are often used to automate repetitive tasks. • Repeating identical or similar tasks without making errors • Two main loop statements are available. for while
- 14. Iteration Lecture 18 Break Square roots for & while statement
- 15. Break • The break is a keyword in python which is used to terminate the loop. • It breaks the inner loop first and then proceeds to outer loops. while True: line = input('Enter line to print: ') if line == 'Exit': break print (line)
- 16. Iteration Lecture 18 Break Square roots for & while statement
- 17. Square roots • Suppose that you want to know the square root of a. • Take x initially, compute a better estimate with the following formula:
- 18. Square roots
- 19. Square roots
- 20. Iteration Lecture 18 Break Square roots for & while statement