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Multiindex with single level no longer allows selecting columns

Multiindex with single level no longer allows selecting columns: a task in MiMo-V2.6-RL-oss: Agentic RL Environments (MiMo RL release). This works fine in pandas 0.22.0 but fails in 0.25.3 It appears a bug may have been introduced. I have some old code that accidentally created a MultiIndex with a…

The task

This works fine in pandas 0.22.0 but fails in 0.25.3 It appears a bug may have been introduced. I have some old code that accidentally created a MultiIndex with a single level instead of a regular index, but everything worked fine with pandas 0.22.0. However, in new versions of…

Part of XiaomiMiMo/MiMo-V2.6-RL-oss.