题解 | #遍历字典#

import sys

d = {'<': 'less than', '==': 'equal'}
print('Here is the original dict:')
for i in sorted(d.keys()):
    print('Operator {} means {}.'.format(i, d[i]))

d['>'] = 'greater than'
print()
print('The dict was changed to:')
for i in sorted(d.keys()):
    print('Operator {} means {}.'.format(i, d[i]))