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[英]python: access multiple values in the value portion of a key:value pair
[英]How do you target a specific element inside a values portion of a key:value pair?
我的目標是按如下所示在key:value對中的特定元素,我很困惑。 我想求和並返回所有帶有鍵的元素的值作為“項”。
[{ 'actcost': 5.56,
'bnfcode': '0101010G0AAABAB',
'bnfname': 'Co-MagaldroxSusp 195mg/220mg/5ml S/F',
'items': 2,
'nic': 5.98,
'practice': 'N81013',
'quantity': 1000},
{ 'actcost': 2.78,
'bnfcode': '0101010G0AAABAB',
'bnfname': 'Co-MagaldroxSusp 195mg/220mg/5ml S/F',
'items': 1,
'nic': 2.99,
'practice': 'N81029',
'quantity': 500},
{ 'actcost': 5.56,
'bnfcode': '0101010G0AAABAB',
'bnfname': 'Co-MagaldroxSusp 195mg/220mg/5ml S/F',
'items': 2,
'nic': 5.98,
'practice': 'N81088',
'quantity': 1000}]
所以你先
obj = json.loads(txt)
那個字符串,然后是一個簡單的循環
result = 0
for dct in obj:
result += dct.get('items', 0)
可以縮短為
result = sum(dct.get('items', 0) for dct in obj)
如果您想對其他字段求和
result = 0
for dct in obj:
if 'items' in dct:
result += dct['quantity']
可以縮短為
result = sum(dct['quantity'] for dct in obj if 'items' in dct)
您可以使用ipython或閑置代碼段:
vagrant@vagrant:~$ ipython
Python 3.6.7 (default, Oct 22 2018, 11:32:17)
Type 'copyright', 'credits' or 'license' for more information
IPython 7.4.0 -- An enhanced Interactive Python. Type '?' for help.
In [1]: d = [{'bnfcode': '0101010G0AAABAB', 'items': 2, 'practice': 'N81013', 'bnfname': 'Co-MagaldroxSusp 195mg/220mg/5m
...: l S/F', 'nic': 5.98, 'actcost': 5.56, 'quantity': 1000}, {'bnfcode': '0101010G0AAABAB', 'items': 1, 'practice': '
...: N81029', 'bnfname': 'Co-MagaldroxSusp 195mg/220mg/5ml S/F', 'nic': 2.99, 'actcost': 2.78, 'quantity': 500}, {'bnf
...: code': '0101010G0AAABAB', 'items': 2, 'practice': 'N81088', 'bnfname': 'Co-MagaldroxSusp 195mg/220mg/5ml S/F', 'n
...: ic': 5.98, 'actcost': 5.56, 'quantity': 1000}]
In [2]: sum([i.get('items', 0) for i in d])
Out[2]: 5
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