在 Pandas 中将列转换为字符串 [英] Convert columns to string in Pandas
本文介绍了在 Pandas 中将列转换为字符串的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有以下来自 SQL 查询的 DataFrame:
I have the following DataFrame from a SQL query:
(Pdb) pp total_rows
ColumnID RespondentCount
0 -1 2
1 3030096843 1
2 3030096845 1
我想像这样旋转它:
total_data = total_rows.pivot_table(cols=['ColumnID'])
(Pdb) pp total_data
ColumnID -1 3030096843 3030096845
RespondentCount 2 1 1
[1 rows x 3 columns]
total_rows.pivot_table(cols=['ColumnID']).to_dict('records')[0]
{3030096843: 1, 3030096845: 1, -1: 2}
但我想确保将 303 列转换为字符串而不是整数,以便我得到这个:
but I want to make sure the 303 columns are casted as strings instead of integers so that I get this:
{'3030096843': 1, '3030096845': 1, -1: 2}
推荐答案
转换为字符串的一种方法是使用 astype:
One way to convert to string is to use astype:
total_rows['ColumnID'] = total_rows['ColumnID'].astype(str)
然而,也许您正在寻找to_json
函数,它会将键转换为有效的 json(因此将键转换为字符串):
However, perhaps you are looking for the to_json
function, which will convert keys to valid json (and therefore your keys to strings):
In [11]: df = pd.DataFrame([['A', 2], ['A', 4], ['B', 6]])
In [12]: df.to_json()
Out[12]: '{"0":{"0":"A","1":"A","2":"B"},"1":{"0":2,"1":4,"2":6}}'
In [13]: df[0].to_json()
Out[13]: '{"0":"A","1":"A","2":"B"}'
注意:您可以传入一个缓冲区/文件来保存它,以及其他一些选项......
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