python - KeyError when data encoded as string -


after struggle plotting code, end following minimal working example:

import pandas import matplotlib.pyplot plt  data = {     'foo': ['2', '335', '3'],     'bar': [1, 2, 1], }  pandas.dataframe(data).plot.scatter('foo', 'bar')  # keyerror plt.show()

which raise keyerror: 'foo'.

however, if use integers in foo data instead of strings:

'foo': [2, 335, 3],

i expected scatterplot, without error.

what rationale dataframe behavior ? can understand data must in same format. why raise (very laconic) keyerror in case ?


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