Question

help(difflib.get_close_matches)
Help on function get_close_matches in module difflib:

get_close_matches(word, possibilities, n=3, cutoff=0.6)
Use SequenceMatcher to return list of the best "good enough" matches.

word is a sequence for which close matches are desired (typically a
string).
possibilities is a list of sequences against which to match              
word(typically a list of strings).

我可以将dict.keys（）用作get_close_matches中的参数“ possibilities”，其中“ possibilities”需要一个列表。但是为什么我不能像普通的列表一样访问dict.items（）像a [0]，a [1]（a是一个列表）？

Answer 1

在Python 3中，dict.items()（还有.keys()和.values()）返回一个特殊的dictionary view object。它的行为就像一个迭代器，但不是专门的列表。

#!/usr/bin/env python3
d = {}
d['a'] = 1
d['b'] = 2

# You can pack items() into a list and then it's a "real" list    
l = list(d.items())
print(repr(l[1]))

# Or you can use itertools or otherwise use it as a plain iterator
import itertools
for p in itertools.islice(d.items(), 1, 2):
  print(repr(p))

Answer 2

Dict.items（）不返回列表。相反，它返回一类dict_items。如果您仅对键感兴趣，请使用Dict.keys（）。您无法使用索引方法访问字典

普通列表和dict.items（）之间的区别

2 个答案: