def max_median_position_concentration(self, positions):
"""
The max and median of long and short position concentrations
over the time.
Parameters
----------
positions : pd.DataFrame
The positions that the strategy takes over time.
Returns
-------
每天持有个股的最大头寸占比和头寸占比众数（分多空头)
"""
alloc_summary = pos.get_max_median_position_concentration(positions)
return alloc_summary
def test_max_median_exposure(self, positions, expected):
alloc_summary = get_max_median_position_concentration(positions)
assert_frame_equal(expected, alloc_summary)
def test_max_median_exposure(self, positions, expected):
alloc_summary = get_max_median_position_concentration(positions)
assert_frame_equal(expected, alloc_summary)