我需要一個迭代器遍歷我的JSON對象中的所有葉子。所以我寫了這個功能如何在新的迭代器中產生迭代器中的元素?
rec = {'a': {'b': [{'c': {'d': [{'e': 'x1','f': 'x2'}],'g': 'x3'}}],'h': 'x4','i': 'x5','j': [{'k': 'x6'}],'l': [{'m': {'n': 'x7'}}]}}
def yield_leaves(rec, lbl = ''):
if isinstance(rec, dict):
for key, value in rec.items():
for to_yield in yield_leaves(value, key):
yield to_yield
if isinstance(rec, list):
for value in rec:
for to_yield in yield_leaves(value, lbl):
yield to_yield
if isinstance(rec, (int, str)):
for entry in rec.split():
yield entry, lbl
print(list(yield_leaves(rec)))
>>> [('x5', 'i'), ('x4', 'h'), ('x1', 'e'), ('x2', 'f'), ('x3', 'g'), ('x6', 'k'), ('x7', 'n')]
但我覺得有些代碼是多餘的。以下行
for to_yield in yield_leaves(value, key):
yield to_yield
它遍歷一個迭代,並返回值作爲一個迭代的一部分。
你知道更有效的方法來編碼嗎?
從yield_leaves(value,key)'yield 3 on Python 3 –