145 lines
4.8 KiB
Python
145 lines
4.8 KiB
Python
import os
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import subprocess
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import sys
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import textwrap
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import pytest
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import pandas as pd
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import pandas._testing as tm
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import pandas.io.common as icom
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@pytest.mark.parametrize(
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"obj",
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[
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pd.DataFrame(
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100 * [[0.123456, 0.234567, 0.567567], [12.32112, 123123.2, 321321.2]],
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columns=["X", "Y", "Z"],
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),
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pd.Series(100 * [0.123456, 0.234567, 0.567567], name="X"),
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],
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)
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@pytest.mark.parametrize("method", ["to_pickle", "to_json", "to_csv"])
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def test_compression_size(obj, method, compression_only):
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with tm.ensure_clean() as path:
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getattr(obj, method)(path, compression=compression_only)
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compressed_size = os.path.getsize(path)
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getattr(obj, method)(path, compression=None)
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uncompressed_size = os.path.getsize(path)
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assert uncompressed_size > compressed_size
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@pytest.mark.parametrize(
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"obj",
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[
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pd.DataFrame(
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100 * [[0.123456, 0.234567, 0.567567], [12.32112, 123123.2, 321321.2]],
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columns=["X", "Y", "Z"],
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),
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pd.Series(100 * [0.123456, 0.234567, 0.567567], name="X"),
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],
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)
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@pytest.mark.parametrize("method", ["to_csv", "to_json"])
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def test_compression_size_fh(obj, method, compression_only):
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with tm.ensure_clean() as path:
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f, handles = icom.get_handle(path, "w", compression=compression_only)
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with f:
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getattr(obj, method)(f)
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assert not f.closed
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assert f.closed
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compressed_size = os.path.getsize(path)
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with tm.ensure_clean() as path:
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f, handles = icom.get_handle(path, "w", compression=None)
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with f:
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getattr(obj, method)(f)
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assert not f.closed
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assert f.closed
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uncompressed_size = os.path.getsize(path)
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assert uncompressed_size > compressed_size
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@pytest.mark.parametrize(
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"write_method, write_kwargs, read_method",
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[
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("to_csv", {"index": False}, pd.read_csv),
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("to_json", {}, pd.read_json),
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("to_pickle", {}, pd.read_pickle),
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],
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)
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def test_dataframe_compression_defaults_to_infer(
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write_method, write_kwargs, read_method, compression_only
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):
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# GH22004
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input = pd.DataFrame([[1.0, 0, -4], [3.4, 5, 2]], columns=["X", "Y", "Z"])
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extension = icom._compression_to_extension[compression_only]
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with tm.ensure_clean("compressed" + extension) as path:
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getattr(input, write_method)(path, **write_kwargs)
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output = read_method(path, compression=compression_only)
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tm.assert_frame_equal(output, input)
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@pytest.mark.parametrize(
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"write_method,write_kwargs,read_method,read_kwargs",
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[
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("to_csv", {"index": False, "header": True}, pd.read_csv, {"squeeze": True}),
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("to_json", {}, pd.read_json, {"typ": "series"}),
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("to_pickle", {}, pd.read_pickle, {}),
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],
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)
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def test_series_compression_defaults_to_infer(
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write_method, write_kwargs, read_method, read_kwargs, compression_only
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):
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# GH22004
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input = pd.Series([0, 5, -2, 10], name="X")
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extension = icom._compression_to_extension[compression_only]
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with tm.ensure_clean("compressed" + extension) as path:
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getattr(input, write_method)(path, **write_kwargs)
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output = read_method(path, compression=compression_only, **read_kwargs)
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tm.assert_series_equal(output, input, check_names=False)
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def test_compression_warning(compression_only):
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# Assert that passing a file object to to_csv while explicitly specifying a
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# compression protocol triggers a RuntimeWarning, as per GH21227.
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df = pd.DataFrame(
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100 * [[0.123456, 0.234567, 0.567567], [12.32112, 123123.2, 321321.2]],
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columns=["X", "Y", "Z"],
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)
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with tm.ensure_clean() as path:
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f, handles = icom.get_handle(path, "w", compression=compression_only)
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with tm.assert_produces_warning(RuntimeWarning, check_stacklevel=False):
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with f:
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df.to_csv(f, compression=compression_only)
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def test_with_missing_lzma():
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"""Tests if import pandas works when lzma is not present."""
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# https://github.com/pandas-dev/pandas/issues/27575
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code = textwrap.dedent(
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"""\
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import sys
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sys.modules['lzma'] = None
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import pandas
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"""
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)
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subprocess.check_output([sys.executable, "-c", code], stderr=subprocess.PIPE)
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def test_with_missing_lzma_runtime():
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"""Tests if RuntimeError is hit when calling lzma without
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having the module available."""
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code = textwrap.dedent(
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"""
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import sys
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import pytest
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sys.modules['lzma'] = None
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import pandas
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df = pandas.DataFrame()
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with pytest.raises(RuntimeError, match='lzma module'):
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df.to_csv('foo.csv', compression='xz')
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"""
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)
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subprocess.check_output([sys.executable, "-c", code], stderr=subprocess.PIPE)
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