[英]pandas - add additional column to an existing csv file
I have 2 files which need to populate the same csv file我有 2 个文件需要填充相同的 csv 文件
To give context, currently, I have this code that prints a CSV in the desired way code-1.py为了给出上下文,目前,我有这个代码以所需的方式打印 CSV code-1.py
Current Existing added:当前现有添加:
array_all = {'Hand': alldata, 'Pose': face_position}
array_all = {k: pd.Series(v) for k, v in array_all.items()}
df = pd.DataFrame(array_all)
df.to_csv('test.csv',
mode='w',
header=True,
index=False)
Hand![]() |
Pose![]() |
---|---|
No![]() |
Seating Back![]() |
No![]() |
Seating Back![]() |
and now I have code-2.py现在我有 code-2.py
Column to add:要添加的列:
df = pd.DataFrame(results)
df.to_csv('test.csv',
mode='a',
header=True,
index=False)
what I want this to do is add a column to the right Desired Output:我想要做的是在右侧添加一列 Desired Output:
Hand![]() |
Pose![]() |
Eye![]() |
---|---|---|
No![]() |
Seating Back![]() |
Left![]() |
No![]() |
Seating Back![]() |
Right![]() |
However, currently I am getting this,但是,目前我得到了这个,
Actual Output:实际 Output:
Hand![]() |
Pose![]() |
---|---|
No![]() |
Seating Back![]() |
No![]() |
Seating Back![]() |
0 ![]() |
|
Right![]() |
|
Left![]() |
Basically, it is appending to the first column of the CSV Also, it can be assumed that code-2.py will be run immediately following code-1.py基本上,它附加到 CSV 的第一列此外,可以假设 code-2.py 将在 code-1.py 之后立即运行
Appreciate any ideas about this, Thank you!感谢您对此的任何想法,谢谢!
You can't append columns to a csv file without loading it entirely (however, you can append rows).您不能将 append 列添加到 csv 文件而不完全加载它(但是,您可以 append 行)。 Use
pd.concat
:使用
pd.concat
:
pd.concat([pd.read_csv('test.csv'), df], axis=1) \
.to_csv('test.csv', header=True, index=False)
# test.csv before
Hand,Pose
No,Seating Back
No,Seating Back
# test.csv after
Hand,Pose,Eye
No,Seating Back,Left
No,Seating Back,Right
with reference to @Corralien's answer参考@Corralien的回答
I additionally faced an issue where each additional append would record in a new column, as shown here https://i.stack.imgur.com/08oTe.png我还遇到了一个问题,即每个额外的 append 都会记录在一个新列中,如此处所示https://i.stack.imgur.com/08oTe.png
In order to mitigate this, I modified the given answer and created an additional csv and overwrote the csv using that, as shown below:为了缓解这种情况,我修改了给定的答案并创建了一个额外的 csv 并使用它覆盖了 csv ,如下所示:
pd.concat([pd.read_csv('test2.csv'), df], axis=1) \
.to_csv('test.csv', header=True, index=False)
df = (pd.read_csv("test.csv")).assign(Eyes=results)
df.to_csv('test.csv', header=True, index=False)
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