这是我之前关于 Python 中的字符串实习的问题的后续,尽管我认为它的相关性不足以作为一个单独的问题。简而言之,在使用 sys.intern 时,我是否需要在大多数/每次使用时将有问题的字符串传递给函数,或者我只需要将字符串实习一次并跟踪它的引用?为了澄清一个伪代码用例,我做了我认为正确的事情:(见评论)
# stores all words in sequence,
# we want duplicate words too,
# but those should refer to the same string
# (the reason we want interning)
word_sequence = []
# simple word count dictionary
word_dictionary = {}
for line in text:
for word in line: # using magic unspecified parsing/tokenizing logic
# returns a canonical "reference"
word_i = sys.intern(word)
word_sequence.append(word_i)
try:
# do not need to intern again for
# specific use as dictonary key,
# or is something undesirable done
# by the dictionary that would require
# another call here?
word_dictionary[word_i] += 1
except KeyError:
word_dictionary[word_i] = 1
# ...somewhere else in a function far away...
# Let's say that we want to use the word sequence list to
# access the dictionary (even the duplicates):
for word in word_sequence:
# Do NOT need to re-sys.intern() word
# because it is the same string object
# interned previously?
count = word_dictionary[word]
print(count)
如果我想访问不同字典中的单词怎么办?插入 key:value 时是否需要再次使用 sys.intern(),即使该键已被实习?我可以澄清一下吗?先感谢您。