If you use a dictionary in a for statement, it traverses the keys of the dictionary. For example, print_hist prints each key and the corresponding value:
def print_hist(h): for c in h: print c, h[c]
Here’s what the output looks like:
>>> h = histogram('parrot')>>> print_hist(h)a 1p 1r 2t 1o 1
Again, the keys are in no particular order.
Exercise 11.3.Dictionaries have a method called keys that returns the keys of the dictionary, in no particular order, as a list.
Modify print_histto print the keys and their values in alphabetical order.