如何更改 Plotly 中的默认符号序列？

Question

如何更改 Plotly 中的默认符号序列？我正在尝试使用以下 MWE

import plotly.express as px
import plotly.io as pio
import plotly.graph_objects as go

my_template = pio.templates['ggplot2'] # Copy this template.
# Now modify some specific settings of the template.
my_template.data.scatter = [
    go.Scatter(
        marker = dict(size=22),
        symbol_sequence = ['circle', 'square', 'diamond', 'cross', 'x', 'star'],
    )
]
pio.templates.default = my_template # Set my template as default.

fig = px.line(
    data_frame = px.data.gapminder(),
    x = "year",
    y = "lifeExp",
    color = "country",
    symbol = "continent",
)

fig.show()

这会引发错误

ValueError: Invalid property specified for object of type plotly.graph_objs.Scatter: 'symbol'

我有plotly.__version__ == 5.3.1。

我还注意到，在这个 MWE 中，默认标记大小由于某种原因不起作用，我插入的值被忽略了。

Answer 1

从creating themes你可以看到：

如果跟踪类型属性设置为包含多个跟踪的列表，则 随着更多跟踪添加到默认属性循环 图。

因此，您可以设置多个go.Scatter()，并将"diamond" 替换为symbol：

symbol_template.data.scatter = [
    go.Scatter(marker=dict(symbol="diamond", size=10)),
    go.Scatter(marker=dict(symbol="square", size=10)),
    go.Scatter(marker=dict(symbol="circle", size=10)),
]

或者您可以使用具有指定序列的列表推导，如下所示：

new_sequence = ['pentagon', 'hexagram', 'star', 'diamond', 'hourglass', 'bowtie', 'square']

my_template.data.scatter = [
    go.Scatter(marker=dict(symbol=s, size=12)) for s in new_sequence
]

剧情：

完整代码：

import plotly.express as px
import plotly.io as pio
import plotly.graph_objects as go

my_template = pio.templates['ggplot2'] 

new_sequence = ['pentagon', 'hexagram', 'star', 'diamond', 'hourglass', 'bowtie', 'square']

my_template.data.scatter = [
    go.Scatter(marker=dict(symbol=s, size=12)) for s in new_sequence
]

pio.templates.default = my_template

df = px.data.gapminder()
df = df.tail(100)

fig = px.line(
    data_frame = df,
    x = "year",
    y = "lifeExp",
    color = "country",
    symbol = "continent",
)

fig.show()

Answer 2

浏览模板，模板本身似乎没有标记大小或顺序。为什么不直接用.update_traces()调整marker大小，把符号序列放到px.line()里面呢？

import plotly.express as px
import plotly.io as pio
import plotly.graph_objects as go

my_template = pio.templates['ggplot2'] # Copy this template.
pio.templates.default = my_template # Set my template as default.

fig = px.line(
    data_frame = px.data.gapminder(),
    x = "year",
    y = "lifeExp",
    color = "country",
    symbol = "continent",
    symbol_sequence = ['circle', 'square', 'diamond', 'cross', 'x', 'star']

)

fig.update_traces(marker=dict(size=22))
fig.show()

原文：

添加额外参数后：