题解 | #遍历字典#

operators_dict = {'<': 'less than', '==': 'equal' }
print('Here is the original dict:')
for x, y in sorted(operators_dict.items()):
    print('Operator %s means %s.'%(x, y))
operators_dict['>'] = 'greater than'
print()
print('The dict was changed to:')
for a, b in sorted(operators_dict.items()):
    print('Operator %s means %s.'%(a, b))

不要丢了中间的输出空行!!!!!