[英]list of dict from existing list of dict in python
I am very new to Python and wondering some kind of solutions to the below issue.我对 Python 很陌生,想知道以下问题的某种解决方案。
original_list = [{'Table':'A', 'Column':'C1','Data_Type':'int','Column_Style':None, 'others':'O1'},
{'Table':'A', 'Column':'C2', 'Data_Type':'varchar','Column_Style': '20','others':'O2'},
{'Table':'A', 'Column':'C2', 'Data_Type':'numeric','Column_Style': '10,2','others':'O3'}
]
I want to return a list of dictionary where the key is in ['Table', 'Data_Type', 'Column']
and value of Data_Type
is the concatenated value of Data_Type
and Column_Style
.我想返回一个字典列表,其中键位于
['Table', 'Data_Type', 'Column']
并且Data_Type
的值是Data_Type
和Column_Style
的连接值。
# expecting output like below
new_list = [{'Table':'A', 'Column':'C1', 'Data_Type':'int'},
{'Table':'A', 'Column':'C2', 'Data_Type':'varchar(20)'},
{'Table':'A', 'Column':'C2', 'Data_Type':'numeric(10,2)'}
]
new_list = []
for innerDict in original_list:
newDict = {}
for key in innerDict:
if key not in ['Data_Type', 'Column_Style', 'others']:
newDict[key] = innerDict[key]
elif key == 'Data_Type':
if innerDict['Column_Style']:
newDict['Data_Type'] = innerDict['Data_Type'] + '(' + innerDict['Column_Style'] + ')'
else:
newDict['Data_Type'] = innerDict['Data_Type']
new_list.append(newDict)
new_list
will contain the output that you requested, assuming that original_list
is the input list as you have provided it above. new_list
将包含您请求的输出,假设original_list
是您在上面提供的输入列表。
Actually you can use a generator function to generate a dict that match your criteria for each element in your original list of dict实际上,您可以使用生成器函数为原始 dict 列表中的每个元素生成与您的条件相匹配的 dict
def gen_dict(ori_dict_list):
columns = ['Table', 'Data_Type', 'Column']
for element in ori_dict_list:
d = {}
for field in columns:
if field == 'Data_Type':
if element['Column_Style'] is None:
d['Data_Type'] = element['Data_Type']
else:
d['Data_Type'] = "{}({})".format(element['Data_Type'], element["Column_Style"])
else:
d[field] = element[field]
yield d
Demo:演示:
>>> from pprint import pprint # Just to pretty print nothing special
>>> pprint(list(gen_dict(original_list)))
[{'Column': 'C1', 'Data_Type': 'int', 'Table': 'A'},
{'Column': 'C2', 'Data_Type': 'varchar(20)', 'Table': 'A'},
{'Column': 'C2', 'Data_Type': 'numeric(10,2)', 'Table': 'A'}]
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