[英]python pandas DataFrame from a list
How do i create a pandas DataFrame from the following list: 如何从以下列表创建pandas DataFrame:
ls= \
[['41457', 'PRE', '533', '887', '1/3/1978', '2/1/2008', '[REL]', '217', '197800000003'],\
['41458', 'PRE', '533', '887', '1/3/1978', '2/1/2008', '[REL]', '217', '197800000004'],\
['41460', 'PRE', '780', '887', '1/3/1978', '2/1/2008', '[D/T]', '217', '197800000006'],\
['41461', 'PRE', '780', '887', '1/3/1978', '2/1/2008', '[D/T]', '217', '197800000007'],\
['41462', 'PRE', '645', '887', '1/3/1978', '2/1/2008', '[AGREE]', '217', '197800000008'],\
['41463', 'PRE', '645', '887', '1/3/1978', '2/1/2008', '[AGREE]', '217', '197800000009'],\
['41464', 'PRE', '645', '887', '1/3/1978', '2/1/2008', '[AGREE]', '217', '197800000010'],\
['41465', 'PRE', '645', '887', '1/3/1978', '2/1/2008', '[AGREE]', '217', '197800000011'],\
['41489', 'PRE', '533', '887', '1/3/1978', '2/1/2008', '[REL]', '492', '197800000035']]
and have the first elements '41457', '41458' ... '41489' as the index. 并将第一个元素'41457','41458'...'41489'作为索引。
You can just pass the list to the DataFrame
constructor, and set the index using the column name: 您只需将列表传递给DataFrame
构造函数,然后使用列名设置索引:
In [5]: df = pd.DataFrame(ls).set_index(0)
In [6]: df
Out[6]:
1 2 3 4 5 6 7 8
0
41457 PRE 533 887 1/3/1978 2/1/2008 [REL] 217 197800000003
41458 PRE 533 887 1/3/1978 2/1/2008 [REL] 217 197800000004
41460 PRE 780 887 1/3/1978 2/1/2008 [D/T] 217 197800000006
41461 PRE 780 887 1/3/1978 2/1/2008 [D/T] 217 197800000007
41462 PRE 645 887 1/3/1978 2/1/2008 [AGREE] 217 197800000008
41463 PRE 645 887 1/3/1978 2/1/2008 [AGREE] 217 197800000009
41464 PRE 645 887 1/3/1978 2/1/2008 [AGREE] 217 197800000010
41465 PRE 645 887 1/3/1978 2/1/2008 [AGREE] 217 197800000011
41489 PRE 533 887 1/3/1978 2/1/2008 [REL] 492 197800000035
Note that the columns are just numbers unless you provide column names (note you are specifying the column name, not the index so it's 'a' now): 请注意,除非您提供列名,否则列只是数字(请注意,您指定的是列名,而不是索引,因此它现在是'a'):
In [7]: df = pd.DataFrame(ls, columns=['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i']).set_index('a')
In [8]: df
Out[8]:
b c d e f g h i
a
41457 PRE 533 887 1/3/1978 2/1/2008 [REL] 217 197800000003
41458 PRE 533 887 1/3/1978 2/1/2008 [REL] 217 197800000004
41460 PRE 780 887 1/3/1978 2/1/2008 [D/T] 217 197800000006
41461 PRE 780 887 1/3/1978 2/1/2008 [D/T] 217 197800000007
41462 PRE 645 887 1/3/1978 2/1/2008 [AGREE] 217 197800000008
41463 PRE 645 887 1/3/1978 2/1/2008 [AGREE] 217 197800000009
41464 PRE 645 887 1/3/1978 2/1/2008 [AGREE] 217 197800000010
41465 PRE 645 887 1/3/1978 2/1/2008 [AGREE] 217 197800000011
41489 PRE 533 887 1/3/1978 2/1/2008 [REL] 492 197800000035
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