When only one value is set for `xaxis.range`, the other value becomes invalid.

[trouver]

If one of the values for xaxis.range is set to None, the other set value will not take effect. Both values for xaxis.range need to be set simultaneously to be effective. The same issue does not occur with yaxis.range.

In the following code, setting the first value of xaxis.range to None and the second value to 100 does not set the x-axis range to [0, 100].

import plotly.express as px


df = {'fruit': ['banana', 'orange', 'apple'], 'price': [10, 20, 30]}
fig = px.bar(df, x='price', y='fruit')
fig.update_layout(xaxis={'range': [None, 100]})
fig.show()

In the code below, with both values of xaxis.range set, it works correctly.

import plotly.express as px


df = {'fruit': ['banana', 'orange', 'apple'], 'price': [10, 20, 30]}
fig = px.bar(df, x='price', y='fruit')
fig.update_layout(xaxis={'range': [0, 100]})
fig.show()

Test Environment:

OS: Windows 10
Python Version: 3.12.4
Plotly Version: 5.23.0

[trouver]

I discovered that the margin affects the effectiveness of the range. When margins are set for l/r/t/b, if one element of the range is set to None, then the value set for the other element will become invalid.

case 1

import plotly.express as px


df = {'fruit': ['banana', 'orange', 'apple'], 'price': [10, 20, 30]}
fig = px.bar(df, x='fruit', y='price')
fig.update_layout(
        yaxis={'range': [5, None]}, margin={'l': 0, 'r': 0, 't': 0, 'b': 0}
    )
fig.show()

case 2

import plotly.express as px


df = {'fruit': ['banana', 'orange', 'apple'], 'price': [10, 20, 30]}
fig = px.bar(df, x='fruit', y='price')
fig.update_layout(
        yaxis={'range': [None, 50]}, margin={'l': 0, 'r': 0, 't': 0, 'b': 0}
    )
fig.show()

case 3

import plotly.express as px


df = {'fruit': ['banana', 'orange', 'apple'], 'price': [10, 20, 30]}
fig = px.bar(df, x='fruit', y='price')
fig.update_layout(
        yaxis={'range': [5, 50]}, margin={'l': 0, 'r': 0, 't': 0, 'b': 0}
    )
fig.show()

case 4

import plotly.express as px


df = {'fruit': ['banana', 'orange', 'apple'], 'price': [10, 20, 30]}
fig = px.bar(df, x='price', y='fruit')
fig.update_layout(
        xaxis={'range': [5, None]}, margin={'l': 0, 'r': 0, 't': 0, 'b': 0}
    )
fig.show()

case 5

import plotly.express as px


df = {'fruit': ['banana', 'orange', 'apple'], 'price': [10, 20, 30]}
fig = px.bar(df, x='price', y='fruit')
fig.update_layout(
        xaxis={'range': [None, 50]}, margin={'l': 0, 'r': 0, 't': 0, 'b': 0}
    )
fig.show()

case 6

import plotly.express as px


df = {'fruit': ['banana', 'orange', 'apple'], 'price': [10, 20, 30]}
fig = px.bar(df, x='price', y='fruit')
fig.update_layout(
        xaxis={'range': [5, 50]}, margin={'l': 0, 'r': 0, 't': 0, 'b': 0}
    )
fig.show()