371 lines
13 KiB
Python
371 lines
13 KiB
Python
import itertools
|
|
|
|
import numpy as np
|
|
import pytest
|
|
|
|
import pandas as pd
|
|
from pandas.api.extensions import ExtensionArray
|
|
from pandas.core.internals.blocks import EABackedBlock
|
|
from pandas.tests.extension.base.base import BaseExtensionTests
|
|
|
|
|
|
class BaseReshapingTests(BaseExtensionTests):
|
|
"""Tests for reshaping and concatenation."""
|
|
|
|
@pytest.mark.parametrize("in_frame", [True, False])
|
|
def test_concat(self, data, in_frame):
|
|
wrapped = pd.Series(data)
|
|
if in_frame:
|
|
wrapped = pd.DataFrame(wrapped)
|
|
result = pd.concat([wrapped, wrapped], ignore_index=True)
|
|
|
|
assert len(result) == len(data) * 2
|
|
|
|
if in_frame:
|
|
dtype = result.dtypes[0]
|
|
else:
|
|
dtype = result.dtype
|
|
|
|
assert dtype == data.dtype
|
|
if hasattr(result._mgr, "blocks"):
|
|
assert isinstance(result._mgr.blocks[0], EABackedBlock)
|
|
assert isinstance(result._mgr.arrays[0], ExtensionArray)
|
|
|
|
@pytest.mark.parametrize("in_frame", [True, False])
|
|
def test_concat_all_na_block(self, data_missing, in_frame):
|
|
valid_block = pd.Series(data_missing.take([1, 1]), index=[0, 1])
|
|
na_block = pd.Series(data_missing.take([0, 0]), index=[2, 3])
|
|
if in_frame:
|
|
valid_block = pd.DataFrame({"a": valid_block})
|
|
na_block = pd.DataFrame({"a": na_block})
|
|
result = pd.concat([valid_block, na_block])
|
|
if in_frame:
|
|
expected = pd.DataFrame({"a": data_missing.take([1, 1, 0, 0])})
|
|
self.assert_frame_equal(result, expected)
|
|
else:
|
|
expected = pd.Series(data_missing.take([1, 1, 0, 0]))
|
|
self.assert_series_equal(result, expected)
|
|
|
|
def test_concat_mixed_dtypes(self, data):
|
|
# https://github.com/pandas-dev/pandas/issues/20762
|
|
df1 = pd.DataFrame({"A": data[:3]})
|
|
df2 = pd.DataFrame({"A": [1, 2, 3]})
|
|
df3 = pd.DataFrame({"A": ["a", "b", "c"]}).astype("category")
|
|
dfs = [df1, df2, df3]
|
|
|
|
# dataframes
|
|
result = pd.concat(dfs)
|
|
expected = pd.concat([x.astype(object) for x in dfs])
|
|
self.assert_frame_equal(result, expected)
|
|
|
|
# series
|
|
result = pd.concat([x["A"] for x in dfs])
|
|
expected = pd.concat([x["A"].astype(object) for x in dfs])
|
|
self.assert_series_equal(result, expected)
|
|
|
|
# simple test for just EA and one other
|
|
result = pd.concat([df1, df2.astype(object)])
|
|
expected = pd.concat([df1.astype("object"), df2.astype("object")])
|
|
self.assert_frame_equal(result, expected)
|
|
|
|
result = pd.concat([df1["A"], df2["A"].astype(object)])
|
|
expected = pd.concat([df1["A"].astype("object"), df2["A"].astype("object")])
|
|
self.assert_series_equal(result, expected)
|
|
|
|
def test_concat_columns(self, data, na_value):
|
|
df1 = pd.DataFrame({"A": data[:3]})
|
|
df2 = pd.DataFrame({"B": [1, 2, 3]})
|
|
|
|
expected = pd.DataFrame({"A": data[:3], "B": [1, 2, 3]})
|
|
result = pd.concat([df1, df2], axis=1)
|
|
self.assert_frame_equal(result, expected)
|
|
result = pd.concat([df1["A"], df2["B"]], axis=1)
|
|
self.assert_frame_equal(result, expected)
|
|
|
|
# non-aligned
|
|
df2 = pd.DataFrame({"B": [1, 2, 3]}, index=[1, 2, 3])
|
|
expected = pd.DataFrame(
|
|
{
|
|
"A": data._from_sequence(list(data[:3]) + [na_value], dtype=data.dtype),
|
|
"B": [np.nan, 1, 2, 3],
|
|
}
|
|
)
|
|
|
|
result = pd.concat([df1, df2], axis=1)
|
|
self.assert_frame_equal(result, expected)
|
|
result = pd.concat([df1["A"], df2["B"]], axis=1)
|
|
self.assert_frame_equal(result, expected)
|
|
|
|
def test_concat_extension_arrays_copy_false(self, data, na_value):
|
|
# GH 20756
|
|
df1 = pd.DataFrame({"A": data[:3]})
|
|
df2 = pd.DataFrame({"B": data[3:7]})
|
|
expected = pd.DataFrame(
|
|
{
|
|
"A": data._from_sequence(list(data[:3]) + [na_value], dtype=data.dtype),
|
|
"B": data[3:7],
|
|
}
|
|
)
|
|
result = pd.concat([df1, df2], axis=1, copy=False)
|
|
self.assert_frame_equal(result, expected)
|
|
|
|
def test_concat_with_reindex(self, data):
|
|
# GH-33027
|
|
a = pd.DataFrame({"a": data[:5]})
|
|
b = pd.DataFrame({"b": data[:5]})
|
|
result = pd.concat([a, b], ignore_index=True)
|
|
expected = pd.DataFrame(
|
|
{
|
|
"a": data.take(list(range(5)) + ([-1] * 5), allow_fill=True),
|
|
"b": data.take(([-1] * 5) + list(range(5)), allow_fill=True),
|
|
}
|
|
)
|
|
self.assert_frame_equal(result, expected)
|
|
|
|
def test_align(self, data, na_value):
|
|
a = data[:3]
|
|
b = data[2:5]
|
|
r1, r2 = pd.Series(a).align(pd.Series(b, index=[1, 2, 3]))
|
|
|
|
# Assumes that the ctor can take a list of scalars of the type
|
|
e1 = pd.Series(data._from_sequence(list(a) + [na_value], dtype=data.dtype))
|
|
e2 = pd.Series(data._from_sequence([na_value] + list(b), dtype=data.dtype))
|
|
self.assert_series_equal(r1, e1)
|
|
self.assert_series_equal(r2, e2)
|
|
|
|
def test_align_frame(self, data, na_value):
|
|
a = data[:3]
|
|
b = data[2:5]
|
|
r1, r2 = pd.DataFrame({"A": a}).align(pd.DataFrame({"A": b}, index=[1, 2, 3]))
|
|
|
|
# Assumes that the ctor can take a list of scalars of the type
|
|
e1 = pd.DataFrame(
|
|
{"A": data._from_sequence(list(a) + [na_value], dtype=data.dtype)}
|
|
)
|
|
e2 = pd.DataFrame(
|
|
{"A": data._from_sequence([na_value] + list(b), dtype=data.dtype)}
|
|
)
|
|
self.assert_frame_equal(r1, e1)
|
|
self.assert_frame_equal(r2, e2)
|
|
|
|
def test_align_series_frame(self, data, na_value):
|
|
# https://github.com/pandas-dev/pandas/issues/20576
|
|
ser = pd.Series(data, name="a")
|
|
df = pd.DataFrame({"col": np.arange(len(ser) + 1)})
|
|
r1, r2 = ser.align(df)
|
|
|
|
e1 = pd.Series(
|
|
data._from_sequence(list(data) + [na_value], dtype=data.dtype),
|
|
name=ser.name,
|
|
)
|
|
|
|
self.assert_series_equal(r1, e1)
|
|
self.assert_frame_equal(r2, df)
|
|
|
|
def test_set_frame_expand_regular_with_extension(self, data):
|
|
df = pd.DataFrame({"A": [1] * len(data)})
|
|
df["B"] = data
|
|
expected = pd.DataFrame({"A": [1] * len(data), "B": data})
|
|
self.assert_frame_equal(df, expected)
|
|
|
|
def test_set_frame_expand_extension_with_regular(self, data):
|
|
df = pd.DataFrame({"A": data})
|
|
df["B"] = [1] * len(data)
|
|
expected = pd.DataFrame({"A": data, "B": [1] * len(data)})
|
|
self.assert_frame_equal(df, expected)
|
|
|
|
def test_set_frame_overwrite_object(self, data):
|
|
# https://github.com/pandas-dev/pandas/issues/20555
|
|
df = pd.DataFrame({"A": [1] * len(data)}, dtype=object)
|
|
df["A"] = data
|
|
assert df.dtypes["A"] == data.dtype
|
|
|
|
def test_merge(self, data, na_value):
|
|
# GH-20743
|
|
df1 = pd.DataFrame({"ext": data[:3], "int1": [1, 2, 3], "key": [0, 1, 2]})
|
|
df2 = pd.DataFrame({"int2": [1, 2, 3, 4], "key": [0, 0, 1, 3]})
|
|
|
|
res = pd.merge(df1, df2)
|
|
exp = pd.DataFrame(
|
|
{
|
|
"int1": [1, 1, 2],
|
|
"int2": [1, 2, 3],
|
|
"key": [0, 0, 1],
|
|
"ext": data._from_sequence(
|
|
[data[0], data[0], data[1]], dtype=data.dtype
|
|
),
|
|
}
|
|
)
|
|
self.assert_frame_equal(res, exp[["ext", "int1", "key", "int2"]])
|
|
|
|
res = pd.merge(df1, df2, how="outer")
|
|
exp = pd.DataFrame(
|
|
{
|
|
"int1": [1, 1, 2, 3, np.nan],
|
|
"int2": [1, 2, 3, np.nan, 4],
|
|
"key": [0, 0, 1, 2, 3],
|
|
"ext": data._from_sequence(
|
|
[data[0], data[0], data[1], data[2], na_value], dtype=data.dtype
|
|
),
|
|
}
|
|
)
|
|
self.assert_frame_equal(res, exp[["ext", "int1", "key", "int2"]])
|
|
|
|
def test_merge_on_extension_array(self, data):
|
|
# GH 23020
|
|
a, b = data[:2]
|
|
key = type(data)._from_sequence([a, b], dtype=data.dtype)
|
|
|
|
df = pd.DataFrame({"key": key, "val": [1, 2]})
|
|
result = pd.merge(df, df, on="key")
|
|
expected = pd.DataFrame({"key": key, "val_x": [1, 2], "val_y": [1, 2]})
|
|
self.assert_frame_equal(result, expected)
|
|
|
|
# order
|
|
result = pd.merge(df.iloc[[1, 0]], df, on="key")
|
|
expected = expected.iloc[[1, 0]].reset_index(drop=True)
|
|
self.assert_frame_equal(result, expected)
|
|
|
|
def test_merge_on_extension_array_duplicates(self, data):
|
|
# GH 23020
|
|
a, b = data[:2]
|
|
key = type(data)._from_sequence([a, b, a], dtype=data.dtype)
|
|
df1 = pd.DataFrame({"key": key, "val": [1, 2, 3]})
|
|
df2 = pd.DataFrame({"key": key, "val": [1, 2, 3]})
|
|
|
|
result = pd.merge(df1, df2, on="key")
|
|
expected = pd.DataFrame(
|
|
{
|
|
"key": key.take([0, 0, 0, 0, 1]),
|
|
"val_x": [1, 1, 3, 3, 2],
|
|
"val_y": [1, 3, 1, 3, 2],
|
|
}
|
|
)
|
|
self.assert_frame_equal(result, expected)
|
|
|
|
@pytest.mark.parametrize(
|
|
"columns",
|
|
[
|
|
["A", "B"],
|
|
pd.MultiIndex.from_tuples(
|
|
[("A", "a"), ("A", "b")], names=["outer", "inner"]
|
|
),
|
|
],
|
|
)
|
|
def test_stack(self, data, columns):
|
|
df = pd.DataFrame({"A": data[:5], "B": data[:5]})
|
|
df.columns = columns
|
|
result = df.stack()
|
|
expected = df.astype(object).stack()
|
|
# we need a second astype(object), in case the constructor inferred
|
|
# object -> specialized, as is done for period.
|
|
expected = expected.astype(object)
|
|
|
|
if isinstance(expected, pd.Series):
|
|
assert result.dtype == df.iloc[:, 0].dtype
|
|
else:
|
|
assert all(result.dtypes == df.iloc[:, 0].dtype)
|
|
|
|
result = result.astype(object)
|
|
self.assert_equal(result, expected)
|
|
|
|
@pytest.mark.parametrize(
|
|
"index",
|
|
[
|
|
# Two levels, uniform.
|
|
pd.MultiIndex.from_product(([["A", "B"], ["a", "b"]]), names=["a", "b"]),
|
|
# non-uniform
|
|
pd.MultiIndex.from_tuples([("A", "a"), ("A", "b"), ("B", "b")]),
|
|
# three levels, non-uniform
|
|
pd.MultiIndex.from_product([("A", "B"), ("a", "b", "c"), (0, 1, 2)]),
|
|
pd.MultiIndex.from_tuples(
|
|
[
|
|
("A", "a", 1),
|
|
("A", "b", 0),
|
|
("A", "a", 0),
|
|
("B", "a", 0),
|
|
("B", "c", 1),
|
|
]
|
|
),
|
|
],
|
|
)
|
|
@pytest.mark.parametrize("obj", ["series", "frame"])
|
|
def test_unstack(self, data, index, obj):
|
|
data = data[: len(index)]
|
|
if obj == "series":
|
|
ser = pd.Series(data, index=index)
|
|
else:
|
|
ser = pd.DataFrame({"A": data, "B": data}, index=index)
|
|
|
|
n = index.nlevels
|
|
levels = list(range(n))
|
|
# [0, 1, 2]
|
|
# [(0,), (1,), (2,), (0, 1), (0, 2), (1, 0), (1, 2), (2, 0), (2, 1)]
|
|
combinations = itertools.chain.from_iterable(
|
|
itertools.permutations(levels, i) for i in range(1, n)
|
|
)
|
|
|
|
for level in combinations:
|
|
result = ser.unstack(level=level)
|
|
assert all(
|
|
isinstance(result[col].array, type(data)) for col in result.columns
|
|
)
|
|
|
|
if obj == "series":
|
|
# We should get the same result with to_frame+unstack+droplevel
|
|
df = ser.to_frame()
|
|
|
|
alt = df.unstack(level=level).droplevel(0, axis=1)
|
|
self.assert_frame_equal(result, alt)
|
|
|
|
expected = ser.astype(object).unstack(
|
|
level=level, fill_value=data.dtype.na_value
|
|
)
|
|
if obj == "series" and not isinstance(ser.dtype, pd.SparseDtype):
|
|
# GH#34457 SparseArray.astype(object) gives Sparse[object]
|
|
# instead of np.dtype(object)
|
|
assert (expected.dtypes == object).all()
|
|
|
|
result = result.astype(object)
|
|
|
|
self.assert_frame_equal(result, expected)
|
|
|
|
def test_ravel(self, data):
|
|
# as long as EA is 1D-only, ravel is a no-op
|
|
result = data.ravel()
|
|
assert type(result) == type(data)
|
|
|
|
# Check that we have a view, not a copy
|
|
result[0] = result[1]
|
|
assert data[0] == data[1]
|
|
|
|
def test_transpose(self, data):
|
|
result = data.transpose()
|
|
assert type(result) == type(data)
|
|
|
|
# check we get a new object
|
|
assert result is not data
|
|
|
|
# If we ever _did_ support 2D, shape should be reversed
|
|
assert result.shape == data.shape[::-1]
|
|
|
|
# Check that we have a view, not a copy
|
|
result[0] = result[1]
|
|
assert data[0] == data[1]
|
|
|
|
def test_transpose_frame(self, data):
|
|
df = pd.DataFrame({"A": data[:4], "B": data[:4]}, index=["a", "b", "c", "d"])
|
|
result = df.T
|
|
expected = pd.DataFrame(
|
|
{
|
|
"a": type(data)._from_sequence([data[0]] * 2, dtype=data.dtype),
|
|
"b": type(data)._from_sequence([data[1]] * 2, dtype=data.dtype),
|
|
"c": type(data)._from_sequence([data[2]] * 2, dtype=data.dtype),
|
|
"d": type(data)._from_sequence([data[3]] * 2, dtype=data.dtype),
|
|
},
|
|
index=["A", "B"],
|
|
)
|
|
self.assert_frame_equal(result, expected)
|
|
self.assert_frame_equal(np.transpose(np.transpose(df)), df)
|
|
self.assert_frame_equal(np.transpose(np.transpose(df[["A"]])), df[["A"]])
|