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Midterm Exam 2 Review Spring 2006: WhooooOOOooo

I see this on several different example. What does str(frame) of str(num) stand for or do?
str converts any given input into a string. -Student1680
REMOVEDw about having a directory as an input; do I set it before or just type in the name of the folder?
either would work. remember when you "set it before" you're just putting that name into a variable to be used later. Student1919
does the text move around in a V shape? down from the left and then back up on the right? it creates 100 frames with the string on each of them?
Almost. REMOVED the direction the text is moving again. Try plugging in values to see what you get for x and y. -Student2042
What does num == str(frame) do? and what does the line under it do?
The line actually reads... num = str(frame) but look at this line... writePictureTo(canvas, directory + '//frame' + num + '.jpg') and think about what the variable 'num' is right there. The line under that is an if statement that is just testing a condition. If the LHS is equal to the RHS, then it executes the code that is indented underneath it, if not, it skips it and moves on. -Student2042
It's an upside down V hahahahaha!
range(100) returns [0,...,99] which is 100 numbers. Thus there are 100 frames
In writePictureTo(canvas, directory + '//frame' + num + '.jpg')

what is the significance of canvas?
REMOVEDw else would Python know which picture to write to the file? Colin Potts
i know this was asked but it wasnt answered: so does it create 100 frames since its range (100) and not range (1,100) which would be 99 frames? 
also "What do the frame names look like?" is it 1-9 frame0#.jpg and frame 10> frame#.jpg?

"i understand the if statement, but what does len(num) == 1 do, besides add a variable that is added to where it's written"
It makes it so there is a 0 infront of frames with length of one digit. This is done so the frames are in a nice order 01,02, . .09,10



i understand the if statement, but what does len(num) == 1 do, besides add a variable that is added to where it's written

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