题解 | #遍历字典#

operator_dict={'<':'less than','==':'equal'}
print('Here is the original dict:')
for x in sorted(operator_dict):
   print(f'Operator {x} means {operator_dict[x]}.')
print(" ")
operator_dict['>']='greater than'
print("The dict was changed to:")
for x in sorted(operator_dict):
   print(f'Operator {x} means {operator_dict[x]}.')
   “”“f-string用大括号{}表示被替换的字段，其中直接填入替换内容”“”