ModuleNotFoundError：没有名为“ dash.dependencies”的模块； “破折号”不是包

Question

ModuleNotFoundError：没有名为“ dash.dependencies”的模块； “破折号”不是包

import dash
import dash_core_components as dcc
import dash_html_components as html
from dash.dependencies import Input, Output

external_stylesheets = ['https://codepen.io/chriddyp/pen/bWLwgP.css']

app = dash.Dash(__name__, external_stylesheets=external_stylesheets)

app.layout = html.Div([])

if __name__ == '__main__':
    app.run_server(debug=True, host='127.0.0.1', port=8081)

----错误

C:\Users\TheOng>python Desktop\Python\asso.py
Traceback (most recent call last):
  File "Desktop\Python\asso.py", line 1, in <module>
    import dash
  File "C:\Users\TheOng\Desktop\Python\dash.py", line 2, in <module>
    from dash.dependencies import Input, Output
ModuleNotFoundError: No module named 'dash.dependencies'; 'dash' is not a package