£ tick formatter in Plotly that respects negative values

Question

Is there a way to format ticks in Plotly with a £ prefix and the negative sign in the proper place?

yaxis_tickformat='$,' works for $:

import plotly.express as px

fig = px.line(x=[1, 2], y=[3, -4])
fig.update_layout(yaxis_tickformat='$,')

fig.show()

But this is ignored for £:

fig.update_layout(yaxis_tickformat='£,')

fig.show()

And using tickprefix puts the - in the wrong place:

fig.update_layout(yaxis_tickprefix='£', yaxis_tickformat=',')

fig.show()

Notebook for reference.

Answer 1

You can set locale config for Your axis and specify currency symbol.
All options are described here.

So You can use yaxis_tickformat='$,', but You have to change currency to £.

Here is working code:

import plotly.express as px

fig = px.line(x=[1, 2], y=[3, -4])
fig.update_layout(yaxis_tickformat='$,')

config = {
          'locales': {
              'en': {
                'format': {'currency': ["£", ""]}}
              }
          }
fig.show(config=config)

Assuming Your locale is en.

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