题解 | #遍历字典#

operators_dict = {'<': 'less than','==': 'equal'}

print('Here is the original dict:')
#reverse=False，默认是False升序，true降序
for i in sorted(operators_dict,reverse=False):
    print(f"Operator {i} means {operators_dict[i]}.")

#往字典中增加键值对:'>':'greater than'    
operators_dict['>'] = 'greater than'
print()
print('The dict was changed to:')
for j in sorted(operators_dict):
    print(f"Operator {j} means {operators_dict[j]}.")