我想得到一個包含變數的串列并過濾它
我成功洗掉了不必要的單詞，但是
filters = [] 在這里不起作用。列印（過濾）= []
根據過濾后的變數，我想要的是“美元”或（和）“歐元”。
追加似乎是問題...我不知道原因
而在第二個代碼中，為什么 POA 沒有被洗掉？無法從串列中洗掉特定字符？
def test():
response = [{'1': 0, '2': '2A', '3': True, '4': True, 'QA': ['NZDUSD','NZDEUR','NZDYEN','NZDGBP']}]
if response == []:
return
else:
response = str(response [0]['QA'])
response = response.replace('NZD','')
filtered = []
for data in [response]:
if data in ['USD','EUR']:
filtered.append(data)
# print(data)
print(filtered)
if 'USD' in filtered and 'EUR' in filtered:
print ('USDEUR')
elif 'USD' in filtered:
print ('USD')
elif 'EUR' in filtered:
print ('EUR')
test()
def test():
response = [{'1': 0, '2': '2A', '3': True, '4': True, 'QA': ['POAUSD','POAEUR','POAYEN','POAGBP']}]
if response == []:
return
else:
response = response [0]['QA']
for i in range(len(response)):
if response[i] == 'POA':
response[i] = ''
# print(response)
filtered = []
for data in [response]:
if data in ['USD','EUR']:
filtered.append(data)
print(data)
print(filtered)
if 'USD' in filtered and 'EUR' in filtered:
return print('USDEUR')
elif 'USD' in filtered:
return print('USD')
elif 'EUR' in filtered:
return print('EUR')
test()
uj5u.com熱心網友回復：
關于您的第一個代碼：回應是一個字串而不是一個串列，因此“回應資料”將產生單個字符，而不是您期望的單詞。
要使其按您的意愿作業，請修改這部分代碼：
...
else:
response = response [0]['QA']
response = [ word.replace('NZD','') for word in response]
# print("result: ",response) # testing statement
filtered = []
for data in response:
...
關于您的第二個代碼：
if response[i] == "POA":
總會失敗；您想將它和以下行（在其他解決方案中）替換為：
if response[i].startswith('POA'):
response[i] = response[i][3:] # or ... = response[i].replace('POA','')
更進一步，
for data in response:
代替
for data in [response]:
（解釋：[response] 是一個包含 response 作為其唯一值的串列，因此對于 [response] 中的資料：相當于“data = response”）
uj5u.com熱心網友回復：
如果我理解正確你想要做的是：
def test():
response = [{'1': 0, '2': '2A', '3': True, '4': True, 'QA': ['NZDUSD','NZDEUR','NZDYEN','NZDGBP']}]
if response == []:
return
else:
response = str(response [0]['QA'][0])
response = response.replace('NZD','')
filtered = []
for data in [response]:
if data in ['USD','EUR']:
filtered.append(data)
# print(data)
print(filtered)
if 'USD' in filtered and 'EUR' in filtered:
print ('USDEUR')
elif 'USD' in filtered:
print ('USD')
elif 'EUR' in filtered:
print ('EUR')
test()
輸出是：
['USD']
USD
但這是下次的提示，當您發布時，請將您的變數命名得稍微清楚一點，對每個變數都有更多的含義 - 一切都是“回應”，這不是一個反復使用的好名字（當然這是不好的做法在同一個腳本中一遍又一遍地回收變數名）但我想你明白了我的意思:)
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