python：ValueError：没有足够的值来解包（预期为2，得到0）
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时间：2020-08-19 13:20:40 来源:igfitidea点击:
python: ValueError: not enough values to unpack (expected 2, got 0)
提问by simplesystems
What does this error mean?
这个错误是什么意思？
labels, freq = zip(*terms_hash)
ValueError: not enough values to unpack (expected 2, got 0)
When I just print the terms out there is no error.
当我只是打印条款时，没有错误。
code:
代码：
fname = 'stream.json'
with open(fname, 'r') as f:
print('alle Hashtags')
count_all = Counter()
for line in f:
tweet = json.loads(line)
# Count hashtags only
terms_hash = [term for term in preprocess(tweet['text'])
if term.startswith('#')]
# Update the counter
count_all.update(terms_hash)
terms_hash = count_all.most_common(5)
labels, freq = zip(*terms_hash)
data = {'data': freq, 'x': labels}
bar = vincent.Bar(data, iter_idx='x')
bar.to_json('term_freq.json')
# Print the first 5 most frequent words
print(count_all.most_common(5))
回答by John Gordon
It means that python expected there to be two return values from zip(), but there were none.
这意味着 python 期望 zip() 有两个返回值，但没有。
