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[英]Check if a value from a list of values in a python dictionary exists in another dictionary
[英]Find if a value in a list exists in a dictionary in python
我有一個清單,就像
myList= ['France', 'Brazil', 'Armenia']
和一本像
countryDict = {'Argentina':10, 'Spain':23, 'France':66, 'Portugal:10', 'Brazil':120, 'Armenia':99}
如果它與列表匹配,我如何打印字典中鍵的名稱,並用它打印值?
我試過了
for name in countries_avg_dict:
if name in country_List:
print(countries_avg_dict[name])
但是這不起作用,有什么幫助嗎?
我收到一個錯誤
DeprecationWarning: The truth value of an empty array is ambiguous. Returning False, but in future this will result in an error. Use `array.size > 0` to check that an array is not empty.
您需要遍歷myList
並檢查其中的國家/地區是否在countryDict
中:
for country in myList:
if country in countryDict:
print(country, countryDict[country])
Output:
France 66
Brazil 120
Armenia 99
您不需要執行嵌套循環來查找它們是否在字典中,只需使用bool()
運算符來查找元素是否存在,您可以在 try-except 中執行此操作以捕獲 KeyError 以防萬一該元素在字典中不存在
使用每個循環:
myList= ['France', 'Brazil', 'Armenia', 'FakeCountry']
countryDict = {'Argentina':10, 'Spain':23, 'France':66, 'Portugal':10, 'Brazil':120, 'Armenia':99}
for item in myList:
try:
print(item, bool(countryDict[item]))
except KeyError:
print(item, False)
使用索引:
myList= ['France', 'Brazil', 'Armenia', 'FakeCountry']
countryDict = {'Argentina':10, 'Spain':23, 'France':66, 'Portugal':10, 'Brazil':120, 'Armenia':99}
for i in range(len(myList)):
try:
print(myList[i], bool(countryDict[myList[i]]))
except KeyError:
print(myList[i], False)
我相信這可能會有所幫助:
>>> for k,v in countryDict.items():
... if k in myList:
... print(f"{k}: {v}")
...
France: 66
Brazil: 120
Armenia: 99
請讓我知道這是否適合您。 ~X
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