有沒有一種簡單的方法可以測試生成器是否沒有任何東西，例如peek，hasNext，isEmpty等？
3 回答
紅糖糍粑
TA貢獻1815條經(jīng)驗 獲得超6個贊
建議：
def peek(iterable):
try:
first = next(iterable)
except StopIteration:
return None
return first, itertools.chain([first], iterable)
用法：
res = peek(mysequence)
if res is None:
# sequence is empty. Do stuff.
else:
first, mysequence = res
# Do something with first, maybe?
# Then iterate over the sequence:
for element in mysequence:
# etc.
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