Python Altair 渲染错误 - Javascript 错误 : too much recursion

Question

我将 Altair 图表用于 Python 和 Jupyter 笔记本，但是如果我增加数据点的数量，其中一个(渲染？)组件会崩溃:

import altair as alt
import datetime
import pandas as pd
import random

def add_minutes(tm, minutes_to_add):
    fulldate = datetime.datetime(100, 1, 1, tm.hour, tm.minute, tm.second)
    fulldate = fulldate + datetime.timedelta(minutes=minutes_to_add)
    return fulldate.time()

time_sort_order = []

render_hours = 13

def build_df():
    value_list = []
    start_time = datetime.time(21, 0, 0)
    for n in range(60*render_hours):
        time_to_fetch = add_minutes(start_time, 1*n)
        time_sort_order.append(str(time_to_fetch))
        value_list.append({
            "time": str(time_to_fetch),
            "value": random.randint(1, 5)
        })
    return pd.DataFrame(value_list)

df = build_df()

alt.Chart(df).mark_rect().encode(
    x=alt.X('time', sort=time_sort_order),
    color='value:Q'
)

如果我设置 render_hours = 13:一切正常工作/呈现

如果我设置 render_hours = 14:我得到一个空白输出

如果我设置 render_hours = 24:

Javascript Error: too much recursion This usually means there's a typoin your chart specification. See the javascript console for the fulltraceback.

Answer 1

看起来渲染器无法处理具有数百个条目的显式排序顺序；这可能是 Vega 中的一个错误，但它也有点反模式。

尝试做这样的事情:

alt.Chart(df.reset_index()).mark_rect().encode(
    x=alt.X('time', sort=alt.SortField('index')),
    color='value:Q'
)