如何為可繪制圖表的0上方和下方的值制作不同的顏色條

Question

我已經通過繪圖生成了條形圖，如何使條形圖在0上方綠色，而條形圖在0以下紅色？

import plotly
import plotly.graph_objs as go
plotly.offline.init_notebook_mode(connected=True)
trace1 = go.Bar(
    x=df.symbol,
    y=df["percentageChange30dBtc"],

    name='Top10',
    marker = dict(color = 'rgba(63, 195, 128, 1)', 
                              line = dict(color='rgb(0,0,0)',width=1.5)),
   text=df.percentageChange30dBtc,
        textposition='outside'
)
##rgba(252, 214, 112, 1),'rgba(255,174,255,0.5)'
data = [trace1]
plotly.offline.iplot({
    "data": data,
    "layout": go.Layout(barmode='group', yaxis=dict(tickformat=".0%"),title="24H Change Binance"  #tickformat=".0%"
     ,width=800,height=600,)
})

Answer 1

您可以在標記上傳遞顏色列表（假設df [“ percentageChange30dBtc”]的值是數字，如果以%結尾的字符串是float(x.replace('%',''))>0而不是x>0

import plotly
import plotly.graph_objs as go
plotly.offline.init_notebook_mode(connected=True)
trace1 = go.Bar(
    x=df.symbol,
    y=df["percentageChange30dBtc"],

    name='Top10',
    marker = dict(color = ['rgba(63, 195, 128, 1)' if x>0 else 'rgba(219, 10, 91, 1)' for x in df["percentageChange30dBtc"]], 
                 line = dict(color='rgb(0,0,0)',width=1.5)),
   text=df.percentageChange30dBtc,
        textposition='outside'
)
##rgba(252, 214, 112, 1),'rgba(255,174,255,0.5)'
data = [trace1]
plotly.offline.iplot({
    "data": data,
    "layout": go.Layout(barmode='group', yaxis=dict(tickformat=".0%"),title="24H Change Binance"  #tickformat=".0%"
     ,width=800,height=600,)
})