Binned dataframes trouble with branches names with full stops

[asnaylor]

Unable to bin data from branches with full stop in the name without renaming branch. Related to previous issues #95 #54. Solving this would allow a temporary solution to #132 as the previous method of using fast_carpenter.Define to change the variable name to one without a full stop doesn’t work for variables of type ULong_t.

versions:

python==3.8.5
fast-carpenter==0.18.2
pandas==1.1.0
numpy==1.19.1
numexpr==2.7.1
coffea==0.6.42

When attempting to bin a vector<int> with this config results in no errors but an empty csv outputfile from fast_carpenter:

stages:
    - output: fast_carpenter.BinnedDataframe
 
output:
    binning:
        - {in: pulsesTPC.peakTime_ns} #vector<int>

When combining the previous workaround method using fast_carpenter.Define to the config, it results in a KeyError :

stages:
    - define_vars: fast_carpenter.Define
    - output: fast_carpenter.BinnedDataframe
 
define_vars:
    variables:
        - peak_time_ns: pulsesTPC.peakTime_ns 

output:
    binning:
        - {in: pulsesTPC.peakTime_ns} #vector<int>
        - {in: peak_time_ns}

Full Traceback:

concurrent.futures.process._RemoteTraceback:
"""
Traceback (most recent call last):
  File "/home/anaylor/.pyenv/versions/miniconda3-4.3.30/envs/fast_multi_tree/lib/python3.8/concurrent/futures/process.py", line 239, in _process_worker
    r = call_item.fn(*call_item.args, **call_item.kwargs)
  File "/home/anaylor/.pyenv/versions/miniconda3-4.3.30/envs/fast_multi_tree/lib/python3.8/site-packages/coffea/processor/executor.py", line 139, in __call__
    out = self.function(*args, **kwargs)
  File "/home/anaylor/.pyenv/versions/miniconda3-4.3.30/envs/fast_multi_tree/lib/python3.8/site-packages/coffea/processor/executor.py", line 833, in _work_function
    raise e
  File "/home/anaylor/.pyenv/versions/miniconda3-4.3.30/envs/fast_multi_tree/lib/python3.8/site-packages/coffea/processor/executor.py", line 794, in _work_function
    out = processor_instance.process(df)
  File "/home/anaylor/.pyenv/versions/miniconda3-4.3.30/envs/fast_multi_tree/lib/python3.8/site-packages/fast_carpenter/backends/coffea.py", line 64, in process
    work.event(chunk)
  File "/home/anaylor/.pyenv/versions/miniconda3-4.3.30/envs/fast_multi_tree/lib/python3.8/site-packages/fast_carpenter/summary/binned_dataframe.py", line 217, in event
    binned_values = _bin_values(data, dimensions=self._bin_dims,
  File "/home/anaylor/.pyenv/versions/miniconda3-4.3.30/envs/fast_multi_tree/lib/python3.8/site-packages/fast_carpenter/summary/binned_dataframe.py", line 267, in _bin_values
    bins = data.groupby(final_bin_dims, observed=observed)
  File "/home/anaylor/.pyenv/versions/miniconda3-4.3.30/envs/fast_multi_tree/lib/python3.8/site-packages/pandas/core/frame.py", line 6504, in groupby
    return DataFrameGroupBy(
  File "/home/anaylor/.pyenv/versions/miniconda3-4.3.30/envs/fast_multi_tree/lib/python3.8/site-packages/pandas/core/groupby/groupby.py", line 525, in __init__
    grouper, exclusions, obj = get_grouper(
  File "/home/anaylor/.pyenv/versions/miniconda3-4.3.30/envs/fast_multi_tree/lib/python3.8/site-packages/pandas/core/groupby/grouper.py", line 777, in get_grouper
    raise KeyError(gpr)
KeyError: 'pulsesTPC.peakTime_ns'
"""

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/anaylor/.pyenv/versions/miniconda3-4.3.30/envs/fast_multi_tree/bin/fast_carpenter", line 8, in <module>
    sys.exit(main())
  File "/home/anaylor/.pyenv/versions/miniconda3-4.3.30/envs/fast_multi_tree/lib/python3.8/site-packages/fast_carpenter/__main__.py", line 64, in main
    results, _ = backend.execute(sequence, datasets, args)
  File "/home/anaylor/.pyenv/versions/miniconda3-4.3.30/envs/fast_multi_tree/lib/python3.8/site-packages/fast_carpenter/backends/coffea.py", line 100, in execute
    out = run_uproot_job(coffea_datasets, 'events', fp, executor, executor_args=exe_args)
  File "/home/anaylor/.pyenv/versions/miniconda3-4.3.30/envs/fast_multi_tree/lib/python3.8/site-packages/coffea/processor/executor.py", line 1068, in run_uproot_job
    executor(chunks, closure, wrapped_out, **exe_args)
  File "/home/anaylor/.pyenv/versions/miniconda3-4.3.30/envs/fast_multi_tree/lib/python3.8/site-packages/coffea/processor/executor.py", line 567, in futures_executor
    _futures_handler(futures, accumulator, status, unit, desc, add_fn, tailtimeout)
  File "/home/anaylor/.pyenv/versions/miniconda3-4.3.30/envs/fast_multi_tree/lib/python3.8/site-packages/coffea/processor/executor.py", line 197, in _futures_handler
    add_fn(output, finished.pop().result())
  File "/home/anaylor/.pyenv/versions/miniconda3-4.3.30/envs/fast_multi_tree/lib/python3.8/concurrent/futures/_base.py", line 432, in result
    return self.__get_result()
  File "/home/anaylor/.pyenv/versions/miniconda3-4.3.30/envs/fast_multi_tree/lib/python3.8/concurrent/futures/_base.py", line 388, in __get_result
    raise self._exception
KeyError: 'pulsesTPC.peakTime_ns'