45 lines
1.7 KiB
Python
45 lines
1.7 KiB
Python
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# -*- coding: utf-8 -*-
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import numpy as np
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import pandas as pd
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import pandas.util.testing as tm
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class TestSparseGroupBy(object):
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def setup_method(self, method):
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self.dense = pd.DataFrame({'A': ['foo', 'bar', 'foo', 'bar',
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'foo', 'bar', 'foo', 'foo'],
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'B': ['one', 'one', 'two', 'three',
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'two', 'two', 'one', 'three'],
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'C': np.random.randn(8),
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'D': np.random.randn(8),
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'E': [np.nan, np.nan, 1, 2,
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np.nan, 1, np.nan, np.nan]})
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self.sparse = self.dense.to_sparse()
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def test_first_last_nth(self):
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# tests for first / last / nth
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sparse_grouped = self.sparse.groupby('A')
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dense_grouped = self.dense.groupby('A')
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tm.assert_frame_equal(sparse_grouped.first(),
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dense_grouped.first())
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tm.assert_frame_equal(sparse_grouped.last(),
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dense_grouped.last())
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tm.assert_frame_equal(sparse_grouped.nth(1),
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dense_grouped.nth(1))
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def test_aggfuncs(self):
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sparse_grouped = self.sparse.groupby('A')
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dense_grouped = self.dense.groupby('A')
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tm.assert_frame_equal(sparse_grouped.mean(),
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dense_grouped.mean())
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# ToDo: sparse sum includes str column
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# tm.assert_frame_equal(sparse_grouped.sum(),
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# dense_grouped.sum())
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tm.assert_frame_equal(sparse_grouped.count(),
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dense_grouped.count())
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