Keypoints

1.while loop

keeps on looping until the condition is false

use break statement to get out of a while loop

use continue to skip to the next iteration

2. For loops

can be used to iterate over strings,lists,tuples and dictionaries.

break and continue also applies to for loops the same it does in a while loop.

3. range()

range() returns a sequence of numbers within the specified range.

usage format: range(start,stop,step)

range() also returns an iterable object, which could be used in conjunction with for loops.

for x in range(0,5)
    print(x)

#outputs 0,1,2,3,4

4. Other iterators

ch10 - iteration over user-defined objects ch11 - itertools(a useful standard Python module) ch14 - iteration over files