Maps the values of a list to a dictionary using a function, where the key-value pairs consist of the original value as the key and the result of the function as the value.
Use a for
loop to iterate over the list’s values, assigning the values produced by fn
to each key of the dictionary.
代码实现
def map_dictionary(itr, fn):
ret = {}
for x in itr:
ret[x] = fn(x)
return ret
使用样例
map_dictionary([1,2,3], lambda x: x * x) # { 1: 1, 2: 4, 3: 9 }