如何解决Altair 中的条形图：ValueError：分面图无法分层
有没有人有避免错误的建议？
ValueError: 分面图不能分层。
使用这个 Pandas 数据框
K| Lab | FieldName |MissingItemCnt | WorkItemCnt |PercentMissing|
| ----- | ------------------ |------------------| ------------------ | ---------- |
|PQR LAB| MC ADO| 0 | 1 | 0.00 |
|PQR LAB| MC Link| 0 | 1 | 0.00 |
|PQR LAB| HW Received or Expected| 1 | 1 | 100.00 |
|PQR LAB| Requested Start Date| 0 | 1 | 0.00 |
|PQR LAB| Requested End Date| 0 | 1 | 0.00 |
|PQR LAB| Targeted Start Date| 0 | 1 | 0.00 |
|PQR LAB| Targeted End Date| 0 | 1 | 0.00 |
|PQR LAB| Projected End Date| 0 | 1 | 0.00 |
|PQR LAB| Actual Start Date| 1 | 1 | 100.00 |
|PQR LAB| Actual End Date| 1 | 1 | 100.00 |
|PQR LAB| Signoff Date| 1 | 1 | 100.00 |
|PQR LAB| Duration End| 1 | 1 | 100.00 |
|PQR LAB| Duration SignOff| 1 | 1 | 100.00 |
|PQR LAB| HW Recieved Date| 1 | 1 | 100.00 |
|PQR LAB| Tags| 0 | 1 | 0.00 |
|RED LAB| MC ADO| 13 | 137 | 9.49 |
|RED LAB| MC Link| 13 | 137 | 9.49 |
|RED LAB| HW Received or Expected| 18 | 137 | 13.14 |
|RED LAB| Requested Start Date| 3 | 137 | 2.19 |
|RED LAB| Requested End Date| 4 | 137 | 2.92 |
|RED LAB| Targeted Start Date| 6 | 137 | 4.38 |
|RED LAB| Targeted End Date| 7 | 137 | 5.11 |
|RED LAB| Projected End Date| 113| 137 | 82.48 |
|RED LAB| Actual Start Date| 20 | 137 | 14.60 |
|RED LAB| Actual End Date| 25 | 137 | 18.25 |
|RED LAB| Signoff Date| 28 | 137 | 20.44 |
|RED LAB| Duration End| 25 | 137 | 18.25 |
|RED LAB| Duration SignOff| 28 | 137 | 20.44 |
|RED LAB| HW Recieved Date| 32 | 137 | 23.36 |
|RED LAB| Tags| 89 | 137 | 64.96 |
什么使图表多面化以及如何避免此错误？
解决方法
分面图是您使用 column、row 或 .facet 创建数据的多个子图的图表。 See the docs for more details。在您的具体情况下，您可以尝试先分层，然后再切面：
bars = alt.Chart(outer_join_df).mark_bar().encode(
alt.Y('PercentMissing:Q'),x='Lab Location:O',color='Lab Location:N',)
text = bars.mark_text(
align='left',baseline='middle',dx=3 # Nudges text to right so it doesn't appear on top of the bar
).encode(
text='PercentMissing:Q'
)
(bars + text).properties(height=900).facet(column='FieldName:N')
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