更改 polty 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()

这引发了错误

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。

Answer 1

您可以设置您想要的任何符号序列，然后使用 itertools cycle and next 与 fig.for_each_trace() 将它们应用于您的图形：

new_symbols =  cycle(['pentagon', 'hexagram', 'star', 'diamond', 'hourglass', 'bowtie', 'square', 'diamond', 'cross', 'x'])
fig.for_each_trace(lambda t: t.update(marker_symbol = next(new_symbols)))

阴谋：

完整代码：

import plotly.express as px
import plotly.graph_objects as go
from itertools import cycle

df = px.data.gapminder()
df = df.tail(100)
fig = px.line(
    data_frame = df,
    x = "year",
    y = "lifeExp",
    color = "country",
    symbol = "continent",
)

fig.update_traces(marker_size = 12)

new_symbols =  cycle(['pentagon', 'hexagram', 'star', 'diamond', 'hourglass', 'bowtie', 'square', 'diamond', 'cross', 'x'])
fig.for_each_trace(lambda t: t.update(marker_symbol = next(new_symbols)))

fig.show()

Answer 2

查看模板，模板本身似乎没有标记大小或序列。 为什么不直接使用.update_traces()来调整标记大小，并将符号序列放在px.line() ？

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()

原来的：

添加附加参数后：