[英]Pandas Dataframe Create Column of Next Future Date from Unique values of two other columns, with Groupby
[英]Create column of dictionaries with keys and values from other two columns in Pandas DataFrame
我目前有一个Pandas DataFrame,其中有两列,每列包含列表,另一列,包含这两个列表的元素的元组对。 为了方便起见,一个玩具示例如下所示:
col1 col2 col3 col4
0 'a' [0, 1] [8, 9] [(0, 8), (1, 9)]
1 'b' [2, 3] [10, 11] [(2, 10), (3, 11)]
2 'c' [4, 5] [12, 13] [(4, 12), (5, 13)]
3 'd' [6, 7] [14, 15] [(6, 14), (7, 15)]
我想做的是创建第5列col5
,其中包含字典,其中col3
的值作为键, col2
的值作为值。 例如:
col1 col2 col3 col4 col5
0 'a' [0, 1] [8, 9] [(0, 8), (1, 9)] {'8': 0, '9': 1}
1 'b' [2, 3] [10, 11] [(2, 10), (3, 11)] {'10': 2, '11': 3}
2 'c' [4, 5] [12, 13] [(4, 12), (5, 13)] {'12': 4, '13': 5}
3 'd' [6, 7] [14, 15] [(6, 14), (7, 15)] {'14': 6, '15': 7}
我尝试了诸如
df['col5'] = dict(zip(df['col4'].apply(ast.literal_eval), df['col3'].apply(ast.literal_eval)))
但我收到一个错误。 我要做的最合适的方法是什么? 提前致谢。
如果已经创建的col4
可能与map
循环:
df['col5'] = df['col4'].map(lambda x: [{b:a} for a, b in ast.literal_eval(x)])
print (df)
col1 col2 col3 col4 col5
0 'a' [0, 1] [8, 9] [(0, 8), (1, 9)] [{8: 0}, {9: 1}]
1 'b' [2, 3] [10, 11] [(2, 10), (3, 11)] [{10: 2}, {11: 3}]
2 'c' [4, 5] [12, 13] [(4, 12), (5, 13)] [{12: 4}, {13: 5}]
3 'd' [6, 7] [14, 15] [(6, 14), (7, 15)] [{14: 6}, {15: 7}]
或者,如果输入是col3
和col2
使用具有list comprehension
zip:
df['col5'] = [dict(zip(ast.literal_eval(a), ast.literal_eval(b)))
for a, b in zip(df['col3'], df['col2'])]
print (df)
col1 col2 col3 col4 col5
0 'a' [0, 1] [8, 9] [(0, 8), (1, 9)] {8: 0, 9: 1}
1 'b' [2, 3] [10, 11] [(2, 10), (3, 11)] {10: 2, 11: 3}
2 'c' [4, 5] [12, 13] [(4, 12), (5, 13)] {12: 4, 13: 5}
3 'd' [6, 7] [14, 15] [(6, 14), (7, 15)] {14: 6, 15: 7}
或解决方案与apply
:
df['col5'] = (df.apply(lambda x: dict(zip(ast.literal_eval(x['col3']),
ast.literal_eval(x['col2']))), axis=1))
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