使用 Dash 上传和创建 table

Question

我是 Plotly Dash 的新手，我想上传一个 csv 文件并创建一个 table。我可以上传 csv 文件，但它是作为元组上传的，而不是作为 pandas DataFrame 上传的，所以我无法使用 TableData 查看它。

app.layout =html.Div([
        dcc.Upload(
            id='upload',
            children=html.Button('Import un fichier'),
              ),
        html.Div(id="output_data"),])



def parse_data(contents, filename):
    content_type, content_string = contents.split(",")
    decoded = base64.b64decode(content_string)
    try:
        if "csv" in filename: #csv file
            df = pd.read_csv(io.StringIO(decoded.decode("utf-8")), delimiter=',', decimal=','),
            print(type(df)),
        elif "xls" in filename: #xls file
            df = pd.read_excel(io.BytesIO(decoded))
    except Exception as e:
        print(e)
        return html.Div(["There was an error processing this file."])
    print(df)

    return df



 @app.callback(
     Output("output_data", "children"),
     Input("upload", "contents"),
     Input("upload", "filename"),
)
def update_table(contents, filename):
    # table = html.Div()
    if contents:
        df=parse_data(contents,filename)
        table = html.Div(
            [
                html.H4(filename),
                dash_table.DataTable(
                    columns=[{"name": i, "id": i} for i in df.columns],
                    data=df.to_dict("records"),

                ),
                html.Hr(),
                html.Div("Raw Content"),
                html.Pre(
                    contents[0:200] + "...",
                    style={"whiteSpace": "pre-wrap", "wordBreak": "break-all"},
                ),
            ]
        )

        return table

我有这个错误AttributeError: 'tuple' object has no attribute 'columns'

Answer 1

这是问题所在：

if "csv" in filename: #csv file
    df = pd.read_csv(io.StringIO(decoded.decode("utf-8")), delimiter=',', decimal=','),
    print(type(df)),

您在这些行的末尾添加了逗号！这使得值元组。只需删除那些逗号，如下所示：

if "csv" in filename: #csv file
    df = pd.read_csv(io.StringIO(decoded.decode("utf-8")), delimiter=',', decimal=',')
    print(type(df))

使用 Dash 上传和创建 table

Uploading and creating a table using Dash

python

pandas

plotly-dash