1045 week 4

When should we use a while loop instead of a for loop?

• When the intervals or incremental values are known.

• When the condition required to be satisfied to exit loop are not obvious or uniform

• Depends on my mood

• They are both the same

If we want to iterate through a list of strings and only print string that start with "A" or "I", whats the best way to do it?

• For loop

• While loop

• It can't be done

What does range(99,1,-2) return?

• Syntax error since there's no for loop

• A list of all numbers between 99 inclusive and 1 inclusive ([99,98,97,....,2,1])

• A list of every second number between 99 inclusive and 1 inclusive ([99,97,95,....,5,3,1])

• A list of every second number between 99 inclusive and 1 exclusive ([99,97,95,....,5,3])

qTuple = (1,2,3)

qTuple[1] = 11

print(qTuple)

What does the code above

• (11,2,3)

• (1,2,3), since tuples are immutable

• Error since tuples are immutable

dict = {

"apple": "an apple a day, keeps the doctor away",

"cloud": "every cloud has a silver lining",

"sun": "as bright as the sun"

}

print(dict["appl"])

What's the output of the code above?

• an apple a day, keeps the doctor away

• Key error since the key does not exist

• Null since the key does not exist