我需要更改循環外的參數并在滿足特定條件后繼續迭代。例如，我有披薩列表和字符串列表。我有在滿足條件后應該切換的醬汁包列表。如果字符串中存在條件“sauce_error”，我需要從醬包列表中切換到另一個醬包，并使用下一個醬包繼續迭代。#list of sauce packssaucePacks = ['sauce_pack1', 'sauce_pack2', 'sauce_pack3', 'sauce_pack4']index = 0saucePack = saucePacks[index]#list of pizzaspizzas = ['pizza1', 'pizza2', 'pizza3_sauce_error', 'pizza4', 'pizza5']#iterating over stringsfor pizza in pizzas: if 'sauce_error' in pizza: index = index+1 #need to switch sauce pack if substring in string print(saucePack, pizza) else: print(saucePack, pizza)當“pizza”字符串中出現“sauce_error”時，應將醬包切換到列表中的下一個。期望的輸出：sauce_pack1 pizza1sauce_pack1 pizza2sauce_pack2 pizza3_sauce_errorsauce_pack2 pizza4sauce_pack2 pizza5
3 回答
12345678_0001
TA貢獻1802條經驗 獲得超5個贊
您只是忘記使用新索引更新您的 saucePack：
#list of sauce packs
saucePacks = ['sauce_pack1', 'sauce_pack2', 'sauce_pack3', 'sauce_pack4']
index = 0
saucePack = saucePacks[index]
#list of pizzas
pizzas = ['pizza1', 'pizza2', 'pizza3_sauce_error', 'pizza4', 'pizza5']
#iterating over strings
for pizza in pizzas:
if 'sauce_error' in pizza:
index = index+1 #need to switch sauce pack if substring in string
saucePack = saucePacks[index]
print(saucePack, pizza)
else:
print(saucePack, pizza)
尚方寶劍之說
TA貢獻1788條經驗 獲得超4個贊
使用iteraor會更Pythonic?，而不是更新索引并根據它獲取新元素：
#list of sauce packs
saucePacks = iter(['sauce_pack1', 'sauce_pack2', 'sauce_pack3', 'sauce_pack4'])
saucePack = next(saucePacks)
#list of pizzas
pizzas = ['pizza1', 'pizza2', 'pizza3_sauce_error', 'pizza4', 'pizza5']
#iterating over strings
for pizza in pizzas:??
? ? if 'sauce_error' in pizza:
? ? ? ? saucePack = next(saucePacks)? # takes the next sauce from the list
? ? print(saucePack, pizza)
請注意，當迭代器耗盡時，您需要小心（您還需要對索引進行處理，以防它超過列表的大小......）
慕哥9229398
TA貢獻1877條經驗 獲得超6個贊
如果該代碼對您有意義，請使用它。
#list of sauce packs
saucePacks = ['sauce_pack1', 'sauce_pack2', 'sauce_pack3', 'sauce_pack4']
index = 0
#list of pizzas
pizzas = ['pizza1', 'pizza2', 'pizza3_sauce_error', 'pizza4', 'pizza5']
#iterating over strings
for pizza in pizzas:??
? if 'sauce_error' in pizza:
? ? index += 1 #need to switch sauce pack if substring in string
? ? print(saucePacks[index], pizza)
? else:
? ? print(saucePacks[index], pizza)
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