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Midterm Exam 2 Review Fall 2004: Tracing the String Programs

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does this one just print the string without the "i"'s?? and all lowercase? like "georga nsttute of technology"
Not quite... look more closley at these lines: 
  vowels = "aeiou"
  for i in vowels:
    loc = source.find(i)
Note that i is a variable. Greg Leo

ahhh,....so would it get rid of all the vowels??
and all lower case as well.. "grg nsttt f tchnlgy"
Will it get rid of all the vowels, or just some? If some, which ones specifically? This also depends on whether you are referring to program a. or b. Kelly Lyons
what does this mean?
    
if loc <> -1:
  source = source[:loc]+source[loc+1:]

Reason through it. What does it mean for a number to be greater than or less than a -1? Why would the method find return a -1? As for the second line, remember that, for example... string[0:4] would return the 0th 1st 2nd and 3rd characters of a string but not the 4th. Just like range, JES stops before the last number. source[:loc] is basicly like saying "Give me everything up to but not including the "loc" position of source. Greg Leo

Ok this is what i understand.....String4 takes out the first "a","e","i","o", and "u" in the string and makes all caps lower case. String5 takes out all the vowels and makes all cap lower case. But i don't quite understand how. We've (at least I've) never seen any lines like
if loc <> -1:
source = source[:loc]+source[loc+1:]
before.
That's correct, but notice that the string is first made lower case and then the vowels are replaced. Why is this necessary? Greg Leo
it's necessary b/c the I in Institute is capital at first
can someone please explain to me what [loc+1:] means? I know what [:loc] means, by the way, but not the former one.
ok I get it now.
supposing that string4() does only take out the first instance of any vowel... what kind of program would you write to take out all the vowels?

what an aggravating way to write a test problem. You could have used a variable other than "i" you know!


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