Stepping through a ‘for’ loop

1. Stepping through a ‘for’ loop

2. At the beginning - run module for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects

3. Start with the first line - the ‘for’ statement for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects

4. Look at the list for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects

5. Is it empty? No. Start with the first object for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects

6. name “Andrew” Assign the first object to the variable ‘name’ for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects Create the string object “Andrew” and assign it to the variable named ‘name’

7. name “Andrew” Then start the first line of the code block for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects

8. name “Andrew” This is the ‘print’ statement for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects

9. name “Andrew” print the string object “Hello,” and the value of the variable with name ‘name’ for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects Hello,Andrew

10. name “Andrew” The print statement is finished. Python is at the end of the code block... for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects

11. name “Andrew” ... so go to the ‘for’ statement again for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects

12. name “Andrew” Move the list pointer forward by one for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects

13. name “Andrew” Is it past the end? No, it’s on the second item. for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects

14. name “Andrew” “Tsanwani” Assign the second object to the variable ‘name’ for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects Create the string object “Tsanwani” and assign it to the variable named ‘name’

15. name “Andrew” “Tsanwani” Then start the first line of the code block for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects

16. name “Andrew” “Tsanwani” print the string object “Hello,” and the value of the variable with name ‘name’ for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects Hello, Andrew Hello,Tsanwani

17. name “Andrew” “Tsanwani” The print statement is finished. Python is at the end of the code block... for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects

18. name “Andrew” “Tsanwani” ... so go to the ‘for’ statement again for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects

19. name “Andrew” “Tsanwani” Move the list pointer forward by one for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects

20. name “Andrew” “Tsanwani” Is it past the end? No, it’s on the third item. for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects

21. name “Andrew” “Tsanwani” “Arno” Assign the third object to the variable ‘name’ for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects Create the string object “Arno” and assign it to the variable named ‘name’

22. name “Andrew” “Tsanwani” “Arno” Then start the first line of the code block for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects

23. name “Andrew” “Tsanwani” “Arno” print the string object “Hello,” and the value of the variable with name ‘name’ for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects Hello, Andrew Hello, Tsanwani Hello,Arno

24. name “Andrew” “Tsanwani” “Arno” The print statement is finished. Python is at the end of the code block... for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects

25. name “Andrew” “Tsanwani” “Arno” ... so go to the ‘for’ statement again for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects

26. name “Andrew” “Tsanwani” “Arno” Move the list pointer forward by one for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects

27. name “Andrew” “Tsanwani” “Arno” Is it past the end? No, it’s on the fourth item. for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects

28. name “Andrew” “Tsanwani” “Arno” “Tebogo” Assign the fourth object to the variable ‘name’ for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects Create the string object “Tebogo” and assign it to the variable named ‘name’

29. name “Andrew” “Tsanwani” “Arno” “Tebogo” Then start the first line of the code block for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects

30. name “Andrew” “Tsanwani” “Arno” “Tebogo” print the string object “Hello,” and the value of the variable with name ‘name’ for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects Hello, Andrew Hello, Tsanwani Hello, Arno Hello,Tebogo

31. name “Andrew” “Tsanwani” “Arno” “Tebogo” The print statement is finished. Python is at the end of the code block... for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects

32. name “Andrew” “Tsanwani” “Arno” “Tebogo” ... so go to the ‘for’ statement again for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects

33. name “Andrew” “Tsanwani” “Arno” “Tebogo” Move the list pointer forward by one for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects

34. name “Andrew” “Tsanwani” “Arno” “Tebogo” Is it past the end? Yes! for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects

35. name “Andrew” “Tsanwani” “Arno” “Tebogo” So skip past the code block to the next statement. for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects

36. name “Andrew” “Tsanwani” “Arno” “Tebogo” This is another print statement for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects

37. name “Andrew” “Tsanwani” “Arno” “Tebogo” It prints the string “The end.” for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects Hello, Andrew Hello, Tsanwani Hello, Arno Hello, Tebogo The end.

38. name “Andrew” “Tsanwani” “Arno” “Tebogo” Python looks for the next statement... for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects

39. name “Andrew” “Tsanwani” “Arno” “Tebogo” ... but there isn’t any, so Python stops. for name in ["Andrew", "Tsanwani", "Arno", "Tebogo"]: print "Hello,", name print “The end.” Variable Names Objects

40. Final Program Output Hello, Andrew Hello, Tsanwani Hello, Arno Hello, Tebogo The end.