30秒学会 Python 片段 – invert_dictionary

Inverts a dictionary with unique hashable values.

Use dictionary.items() in combination with a list comprehension to create a new dictionary with the values and keys inverted.

代码实现

def invert_dictionary(obj):
  return { value: key for key, value in obj.items() }

使用样例

ages = {
  "Peter": 10,
  "Isabel": 11,
  "Anna": 9,
}
invert_dictionary(ages) # { 10: "Peter", 11 "Isabel", 9: "Anna" }