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 1 p 1 r 2 t 1 o 1
Again, the keys are in no particular order.
Dictionaries have a method called
keys that returns the keys of the dictionary, in no particular order, as a list.
print_hist to print the keys and their values in alphabetical order.