如何将 json 从 dash dcc.Store 保存到 excel 文件？
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【中文标题】如何将 json 从 dash dcc.Store 保存到 excel 文件？【英文标题】：How to save json from dash dcc.Store to excel file? 【发布时间】：2022-01-01 03:47:32 【问题描述】：我正在尝试将用户输入存储在 dcc.store 中，然后使用 store 中的数据保存在 excel 文件中，但是将数据保存到 excel 的回调不起作用。我这样做是因为我也想在计算中使用用户输入，所以我没有保存并再次读取它，而是将用户输入保存在 dcc.store 中并执行我的计算，但也想将其保存在 excel 中以供将来使用. 我的应用程序有 3 个选项卡，在第一个选项卡中，我正在接受用户输入并尝试保存输入。 任何人都可以在这里帮忙，下面是代码。
` dash_app = 此处的工作代码
tabs = dcc.Tabs(
id="dummy-tabs",
value="tab1",
children=[
dcc.Tab(label="Pricing Inputs", value="tab1"),
dcc.Tab(label="Tab 2", value="tab2"),
dcc.Tab(label="Tab 3", value="tab3"),
],
)
layout = html.Div(
children=[
dcc.Store(id="dummy-input-store"),
tabs,
html.Div(id="tabs-content"),
]
)
@dash_app.callback(Output("tabs-content", "children"), Input("dummy-tabs", "value"))
def tab_content_display(tab):
options2 = ["A","B","C"]
tab1_content = html.Div(
[
html.Label(
"Input1",
htmlFor="input1",
style="margin-right": "2em",
),
dcc.Input(
id="input1",
type="text",
placeholder="input type text",
style=
"width": "40%",
"display": "inline-block",
"verticalAlign": "middle",
,
),
html.Br(),
html.Label(
"Input2",
htmlFor="input2",
style="margin-right": "2em",
),
dcc.Dropdown(
id="input2",
options=["label": i, "value": i for i in options2],
style=
"width": "40%",
"display": "inline-block",
"verticalAlign": "middle",
,
),
html.Br(),
html.Div(
[
html.Button(
id="reset-button",
n_clicks=0,
children="Reset",
style=
"fontWeight": "bold",
"textAlign": "center",
"marginRight": 25,
,
title="Click to clear the inputs",
),
html.Button(
id="submit-button",
n_clicks=0,
children="Submit",
style=
"fontWeight": "bold",
"textAlign": "center",
"marginRight": 25,
,
title="Click to save inputs",
),
]
),
html.Div(id="msg"),
]
)
tab2_content = html.Div([html.P("This is tab 2!")])
tab3_content = html.Div([html.P("This is tab 3!")])
if tab == "tab1":
return tab1_content
elif tab == "tab2":
return tab2_content
elif tab == "tab3":
return tab3_content
@dash_app.callback(
Output("dummy-input-store", "data"),
Input("input1", "value"),
Input("input2", "value"),
)
def store_output_tab1(
input1,
input2,
):
return json.dumps(
"Input1": input1,
"Input2": input2,
)
@dash_app.callback(
Output("dummy-input-store", "clear_data"), Input("reset-button", "n_clicks")
)
def reset_click_tab1(n_click_clear):
if n_click_clear is not None and n_click_clear > 0:
return True
return False
@dash_app.callback(
Output("msg", "children"),
Input("submit-button", "n_clicks"),
State("dummy-input-store", "data"),
)
def print_msg_tab1(n_clicks, data):
if n_clicks is not None and n_clicks > 0:
dummy_inputs = pd.DataFrame.from_dict(data, orient="index")
filepath = r"C:\input_data.xlsx"
with pd.ExcelWriter(filepath, mode = 'a') as writer:
dummy_inputs.to_excel(writer,sheet_name = "Dummy_Inputs")
return html.Div([html.H6(f"Inputs Saved:data")])
raise PreventUpdate
`
【问题讨论】：
【参考方案1】：你去吧，虽然 xlsxwriter 中的 mode='a' 可能不是你想要的......我不知道。
import dash
from dash import html, dcc, Input, Output, State
from dash.exceptions import PreventUpdate
import json
import pandas as pd
dash_app = dash.Dash(__name__)
dash_app.config.suppress_callback_exceptions = True
tabs = dcc.Tabs(
id="dummy-tabs",
value="tab1",
children=[
dcc.Tab(label="Pricing Inputs", value="tab1"),
dcc.Tab(label="Tab 2", value="tab2"),
dcc.Tab(label="Tab 3", value="tab3"),
],
)
layout = html.Div(
children=[
dcc.Store(id="dummy-input-store"),
tabs,
html.Div(id="tabs-content"),
]
)
dash_app.layout = layout
@dash_app.callback(Output("tabs-content", "children"), Input("dummy-tabs", "value"))
def tab_content_display(tab):
options2 = ["A","B","C"]
tab1_content = html.Div(
[
html.Label(
"Input1",
htmlFor="input1",
style="margin-right": "2em",
),
dcc.Input(
id="input1",
type="text",
placeholder="input type text",
style=
"width": "40%",
"display": "inline-block",
"verticalAlign": "middle",
,
),
html.Br(),
html.Label(
"Input2",
htmlFor="input2",
style="margin-right": "2em",
),
dcc.Dropdown(
id="input2",
options=["label": i, "value": i for i in options2],
style=
"width": "40%",
"display": "inline-block",
"verticalAlign": "middle",
,
),
html.Br(),
html.Div(
[
html.Button(
id="reset-button",
n_clicks=0,
children="Reset",
style=
"fontWeight": "bold",
"textAlign": "center",
"marginRight": 25,
,
title="Click to clear the inputs",
),
html.Button(
id="submit-button",
n_clicks=0,
children="Submit",
style=
"fontWeight": "bold",
"textAlign": "center",
"marginRight": 25,
,
title="Click to save inputs",
),
]
),
html.Div(id="msg"),
]
)
tab2_content = html.Div([html.P("This is tab 2!")])
tab3_content = html.Div([html.P("This is tab 3!")])
if tab == "tab1":
return tab1_content
elif tab == "tab2":
return tab2_content
elif tab == "tab3":
return tab3_content
@dash_app.callback(
Output("dummy-input-store", "data"),
Input("input1", "value"),
Input("input2", "value"),
)
def store_output_tab1(
input1,
input2,
):
data =
"Input1": [input1],
"Input2": [input2],
return pd.DataFrame.from_dict(data, orient='index').to_dict('records')
@dash_app.callback(
Output("dummy-input-store", "clear_data"), Input("reset-button", "n_clicks")
)
def reset_click_tab1(n_click_clear):
if n_click_clear is not None and n_click_clear > 0:
return True
return False
@dash_app.callback(
Output("msg", "children"),
Input("submit-button", "n_clicks"),
State("dummy-input-store", "data"),
)
def print_msg_tab1(n_clicks, data):
if n_clicks is not None and n_clicks > 0:
dummy_inputs = pd.DataFrame.from_dict(data)
filepath = r"C:\input_data.xlsx"
try:
with pd.ExcelWriter(filepath, engine="openpyxl", mode="a") as writer:
dummy_inputs.to_excel(writer, sheet_name = "Dummy_Inputs")
except FileNotFoundError:
dummy_inputs.to_excel(filepath, sheet_name = "Dummy_Inputs")
return html.Div([html.H6(f"Inputs Saved:data")])
raise PreventUpdate
if __name__ == '__main__':
dash_app.run_server(debug=True)
【讨论】：
感谢您指出问题出在 excel writer 而不是破折号。您的建议是为每个新条目创建一个新标签。所以我决定使用 csv 模块中的 Dictwriter 并将我的数据保存在 csv 文件中。以上是关于如何将 json 从 dash dcc.Store 保存到 excel 文件？的主要内容，如果未能解决你的问题，请参考以下文章
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