How do I align text output in Python?

I've got a function which creates a little star table based on some data collected elsewhere in the program. While the table produces the correct output, since the number of characters in each number changes, it un-aligns the table. For example,

70-78: *****
79-87: ***
88-96: ****
97-105: **
106-114: ******
115-123: ****

Is there any way to align the stars so that the output is something like this:

70-78:   *****
79-87:   ***
88-96:   ****
97-105:  **
106-114: ******
115-123: ****

Here's how I currently print the table.

for x in range(numClasses):
    print('{0}-{1}: {2}'.format(lower[x],upper[x],"*"*num[x]))