fix from_flat for pd input

[dougbrn]

Resolves #145

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.46%. Comparing base (6101d39) to head (cd7ca7e).
Report is 60 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #147   +/-   ##
=======================================
  Coverage   99.46%   99.46%           
=======================================
  Files          14       14           
  Lines         941      943    +2     
=======================================
+ Hits          936      938    +2     
  Misses          5        5           

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[github-actions]

Before [6101d39] <v0.2.2>	After [04a35a1]	Ratio	Benchmark (Parameter)
30.8±2ms	34.3±3ms	~1.11	benchmarks.AssignSingleDfToNestedSeries.time_run
91.8M	93.6M	1.02	benchmarks.NestedFrameQuery.peakmem_run
6.59±0.06ms	6.72±0.07ms	1.02	benchmarks.NestedFrameQuery.time_run
9.55±0.08ms	9.64±0.1ms	1.01	benchmarks.NestedFrameAddNested.time_run
258M	258M	1.00	benchmarks.AssignSingleDfToNestedSeries.peakmem_run
84.8M	84.6M	1.00	benchmarks.NestedFrameAddNested.peakmem_run
88.5M	88.2M	1.00	benchmarks.NestedFrameReduce.peakmem_run
1.09±0.01ms	1.09±0.01ms	1.00	benchmarks.NestedFrameReduce.time_run
282M	281M	1.00	benchmarks.ReassignHalfOfNestedSeries.peakmem_run
58.9±3ms	58.0±3ms	0.99	benchmarks.ReassignHalfOfNestedSeries.time_run

Click here to view all benchmarks.

[hombit]

Thank you!