import numpy as np
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from pandas.compat import WARNING_CHECK_DISABLED
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from pandas import (
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DataFrame,
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option_context,
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)
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import pandas._testing as tm
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from pandas.tests.copy_view.util import get_array
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def test_clip_inplace_reference(using_copy_on_write, warn_copy_on_write):
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df = DataFrame({"a": [1.5, 2, 3]})
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df_copy = df.copy()
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arr_a = get_array(df, "a")
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view = df[:]
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if warn_copy_on_write:
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with tm.assert_cow_warning():
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df.clip(lower=2, inplace=True)
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else:
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df.clip(lower=2, inplace=True)
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if using_copy_on_write:
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assert not np.shares_memory(get_array(df, "a"), arr_a)
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assert df._mgr._has_no_reference(0)
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assert view._mgr._has_no_reference(0)
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tm.assert_frame_equal(df_copy, view)
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else:
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assert np.shares_memory(get_array(df, "a"), arr_a)
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def test_clip_inplace_reference_no_op(using_copy_on_write):
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df = DataFrame({"a": [1.5, 2, 3]})
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df_copy = df.copy()
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arr_a = get_array(df, "a")
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view = df[:]
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df.clip(lower=0, inplace=True)
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assert np.shares_memory(get_array(df, "a"), arr_a)
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if using_copy_on_write:
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assert not df._mgr._has_no_reference(0)
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assert not view._mgr._has_no_reference(0)
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tm.assert_frame_equal(df_copy, view)
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def test_clip_inplace(using_copy_on_write):
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df = DataFrame({"a": [1.5, 2, 3]})
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arr_a = get_array(df, "a")
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df.clip(lower=2, inplace=True)
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assert np.shares_memory(get_array(df, "a"), arr_a)
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if using_copy_on_write:
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assert df._mgr._has_no_reference(0)
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def test_clip(using_copy_on_write):
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df = DataFrame({"a": [1.5, 2, 3]})
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df_orig = df.copy()
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df2 = df.clip(lower=2)
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assert not np.shares_memory(get_array(df2, "a"), get_array(df, "a"))
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if using_copy_on_write:
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assert df._mgr._has_no_reference(0)
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tm.assert_frame_equal(df_orig, df)
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def test_clip_no_op(using_copy_on_write):
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df = DataFrame({"a": [1.5, 2, 3]})
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df2 = df.clip(lower=0)
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if using_copy_on_write:
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assert not df._mgr._has_no_reference(0)
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assert np.shares_memory(get_array(df2, "a"), get_array(df, "a"))
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else:
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assert not np.shares_memory(get_array(df2, "a"), get_array(df, "a"))
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def test_clip_chained_inplace(using_copy_on_write):
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df = DataFrame({"a": [1, 4, 2], "b": 1})
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df_orig = df.copy()
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if using_copy_on_write:
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with tm.raises_chained_assignment_error():
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df["a"].clip(1, 2, inplace=True)
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tm.assert_frame_equal(df, df_orig)
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with tm.raises_chained_assignment_error():
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df[["a"]].clip(1, 2, inplace=True)
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tm.assert_frame_equal(df, df_orig)
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else:
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with tm.assert_produces_warning(
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FutureWarning if not WARNING_CHECK_DISABLED else None,
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match="inplace method",
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):
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df["a"].clip(1, 2, inplace=True)
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with tm.assert_produces_warning(None):
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with option_context("mode.chained_assignment", None):
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df[["a"]].clip(1, 2, inplace=True)
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with tm.assert_produces_warning(None):
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with option_context("mode.chained_assignment", None):
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df[df["a"] > 1].clip(1, 2, inplace=True)
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