Def function does not work with plotly Python

Question

I'm trying to def a functin but i can't call it:

  def test():
      fig = make_subplots(rows=1, cols=2, specs=[
      [{'type': 'scatter'}, {'type': 'table'}]]
                      , shared_xaxes=True,
                      horizontal_spacing=0.05, 
                      vertical_spacing=0.05,  
                      column_widths=[0.7, 0.3])
      pass

  test()

  fig.add_trace(go.Candlestick(x=df.index,
            open=df['Open'],
            high=df['High'],
            low=df['Low'],
            close=df['Close'],
            increasing_line_color = UP_CANDLE,
            decreasing_line_color = DW_CANDLE),row=1,col=1)

When I call it I retrieve the following error: NameError: name 'fig' is not defined If I remove the function, the code works perfectly.

Indentation of your code is incorrect.

yoonghm
– yoonghm

2022-03-26 01:17:29 +00:00
Commented Mar 26, 2022 at 1:17 — yoonghm
– yoonghm, Commented Mar 26, 2022 at 1:17

Derek O · Accepted Answer · 2022-03-26 14:49:49Z

1

Once your local variable fig is inside the function, nothing outside of the function test will have access to fig unless you return fig from the function – you can read about scope in python.

I would rewrite your function like this (and pass doesn't have any purpose in your function so I removed it):

def test():
    fig = make_subplots(
        rows=1, cols=2, 
        specs=[[{'type': 'scatter'}, {'type': 'table'}]], 
        shared_xaxes=True, 
        horizontal_spacing=0.05, 
        vertical_spacing=0.05,  
        column_widths=[0.7, 0.3]
    )
    return fig

Then you can set a variable equal to what your function returns:

fig = test()

And then you'll be able to access the .add_trace method of `fig

fig.add_trace(go.Candlestick(x=df.index,
        open=df['Open'],
        high=df['High'],
        low=df['Low'],
        close=df['Close'],
        increasing_line_color = UP_CANDLE,
        decreasing_line_color = DW_CANDLE),row=1,col=1)

edited Mar 26, 2022 at 14:49

answered Mar 26, 2022 at 2:38

Derek O

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3 Comments

Mad Physicist Over a year ago

More compactly, test().add_trace(...)

Derek O Over a year ago

Sure - that's the way I would probably write it myself - but I feel like this more expanded out version might be easier for the person who asked the question to understand

Mad Physicist Over a year ago

Agreed. That's why it belongs in a comment and not the answer

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