296 lines
11 KiB
Python
296 lines
11 KiB
Python
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"""
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Tests parsers ability to read and parse non-local files
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and hence require a network connection to be read.
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"""
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from io import BytesIO, StringIO
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import logging
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import numpy as np
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import pytest
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import pandas.util._test_decorators as td
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from pandas import DataFrame
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import pandas._testing as tm
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from pandas.io.feather_format import read_feather
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from pandas.io.parsers import read_csv
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@pytest.mark.network
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@pytest.mark.parametrize(
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"compress_type, extension",
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[("gzip", ".gz"), ("bz2", ".bz2"), ("zip", ".zip"), ("xz", ".xz")],
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)
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@pytest.mark.parametrize("mode", ["explicit", "infer"])
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@pytest.mark.parametrize("engine", ["python", "c"])
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def test_compressed_urls(salaries_table, compress_type, extension, mode, engine):
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check_compressed_urls(salaries_table, compress_type, extension, mode, engine)
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@tm.network
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def check_compressed_urls(salaries_table, compression, extension, mode, engine):
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# test reading compressed urls with various engines and
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# extension inference
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base_url = (
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"https://github.com/pandas-dev/pandas/raw/master/"
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"pandas/tests/io/parser/data/salaries.csv"
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)
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url = base_url + extension
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if mode != "explicit":
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compression = mode
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url_table = read_csv(url, sep="\t", compression=compression, engine=engine)
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tm.assert_frame_equal(url_table, salaries_table)
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@tm.network("https://raw.githubusercontent.com/", check_before_test=True)
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def test_url_encoding_csv():
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"""
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read_csv should honor the requested encoding for URLs.
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GH 10424
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"""
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path = (
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"https://raw.githubusercontent.com/pandas-dev/pandas/master/"
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+ "pandas/tests/io/parser/data/unicode_series.csv"
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)
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df = read_csv(path, encoding="latin-1", header=None)
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assert df.loc[15, 1] == "Á köldum klaka (Cold Fever) (1994)"
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@pytest.fixture
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def tips_df(datapath):
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"""DataFrame with the tips dataset."""
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return read_csv(datapath("io", "data", "csv", "tips.csv"))
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@pytest.mark.usefixtures("s3_resource")
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@td.skip_if_not_us_locale()
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class TestS3:
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@td.skip_if_no("s3fs")
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def test_parse_public_s3_bucket(self, tips_df, s3so):
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# more of an integration test due to the not-public contents portion
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# can probably mock this though.
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for ext, comp in [("", None), (".gz", "gzip"), (".bz2", "bz2")]:
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df = read_csv(
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"s3://pandas-test/tips.csv" + ext,
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compression=comp,
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storage_options=s3so,
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)
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assert isinstance(df, DataFrame)
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assert not df.empty
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tm.assert_frame_equal(df, tips_df)
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# Read public file from bucket with not-public contents
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df = read_csv("s3://cant_get_it/tips.csv", storage_options=s3so)
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assert isinstance(df, DataFrame)
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assert not df.empty
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tm.assert_frame_equal(df, tips_df)
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def test_parse_public_s3n_bucket(self, tips_df, s3so):
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# Read from AWS s3 as "s3n" URL
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df = read_csv("s3n://pandas-test/tips.csv", nrows=10, storage_options=s3so)
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assert isinstance(df, DataFrame)
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assert not df.empty
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tm.assert_frame_equal(tips_df.iloc[:10], df)
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def test_parse_public_s3a_bucket(self, tips_df, s3so):
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# Read from AWS s3 as "s3a" URL
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df = read_csv("s3a://pandas-test/tips.csv", nrows=10, storage_options=s3so)
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assert isinstance(df, DataFrame)
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assert not df.empty
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tm.assert_frame_equal(tips_df.iloc[:10], df)
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def test_parse_public_s3_bucket_nrows(self, tips_df, s3so):
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for ext, comp in [("", None), (".gz", "gzip"), (".bz2", "bz2")]:
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df = read_csv(
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"s3://pandas-test/tips.csv" + ext,
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nrows=10,
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compression=comp,
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storage_options=s3so,
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)
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assert isinstance(df, DataFrame)
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assert not df.empty
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tm.assert_frame_equal(tips_df.iloc[:10], df)
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def test_parse_public_s3_bucket_chunked(self, tips_df, s3so):
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# Read with a chunksize
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chunksize = 5
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for ext, comp in [("", None), (".gz", "gzip"), (".bz2", "bz2")]:
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with read_csv(
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"s3://pandas-test/tips.csv" + ext,
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chunksize=chunksize,
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compression=comp,
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storage_options=s3so,
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) as df_reader:
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assert df_reader.chunksize == chunksize
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for i_chunk in [0, 1, 2]:
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# Read a couple of chunks and make sure we see them
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# properly.
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df = df_reader.get_chunk()
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assert isinstance(df, DataFrame)
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assert not df.empty
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true_df = tips_df.iloc[
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chunksize * i_chunk : chunksize * (i_chunk + 1)
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]
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tm.assert_frame_equal(true_df, df)
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def test_parse_public_s3_bucket_chunked_python(self, tips_df, s3so):
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# Read with a chunksize using the Python parser
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chunksize = 5
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for ext, comp in [("", None), (".gz", "gzip"), (".bz2", "bz2")]:
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with read_csv(
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"s3://pandas-test/tips.csv" + ext,
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chunksize=chunksize,
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compression=comp,
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engine="python",
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storage_options=s3so,
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) as df_reader:
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assert df_reader.chunksize == chunksize
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for i_chunk in [0, 1, 2]:
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# Read a couple of chunks and make sure we see them properly.
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df = df_reader.get_chunk()
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assert isinstance(df, DataFrame)
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assert not df.empty
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true_df = tips_df.iloc[
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chunksize * i_chunk : chunksize * (i_chunk + 1)
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]
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tm.assert_frame_equal(true_df, df)
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def test_parse_public_s3_bucket_python(self, tips_df, s3so):
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for ext, comp in [("", None), (".gz", "gzip"), (".bz2", "bz2")]:
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df = read_csv(
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"s3://pandas-test/tips.csv" + ext,
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engine="python",
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compression=comp,
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storage_options=s3so,
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)
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assert isinstance(df, DataFrame)
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assert not df.empty
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tm.assert_frame_equal(df, tips_df)
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def test_infer_s3_compression(self, tips_df, s3so):
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for ext in ["", ".gz", ".bz2"]:
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df = read_csv(
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"s3://pandas-test/tips.csv" + ext,
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engine="python",
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compression="infer",
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storage_options=s3so,
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)
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assert isinstance(df, DataFrame)
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assert not df.empty
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tm.assert_frame_equal(df, tips_df)
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def test_parse_public_s3_bucket_nrows_python(self, tips_df, s3so):
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for ext, comp in [("", None), (".gz", "gzip"), (".bz2", "bz2")]:
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df = read_csv(
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"s3://pandas-test/tips.csv" + ext,
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engine="python",
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nrows=10,
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compression=comp,
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storage_options=s3so,
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)
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assert isinstance(df, DataFrame)
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assert not df.empty
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tm.assert_frame_equal(tips_df.iloc[:10], df)
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def test_read_s3_fails(self, s3so):
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with pytest.raises(IOError):
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read_csv("s3://nyqpug/asdf.csv", storage_options=s3so)
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# Receive a permission error when trying to read a private bucket.
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# It's irrelevant here that this isn't actually a table.
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with pytest.raises(IOError):
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read_csv("s3://cant_get_it/file.csv")
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@pytest.mark.xfail(reason="GH#39155 s3fs upgrade", strict=False)
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def test_write_s3_csv_fails(self, tips_df, s3so):
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# GH 32486
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# Attempting to write to an invalid S3 path should raise
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import botocore
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# GH 34087
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# https://boto3.amazonaws.com/v1/documentation/api/latest/guide/error-handling.html
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# Catch a ClientError since AWS Service Errors are defined dynamically
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error = (FileNotFoundError, botocore.exceptions.ClientError)
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with pytest.raises(error, match="The specified bucket does not exist"):
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tips_df.to_csv(
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"s3://an_s3_bucket_data_doesnt_exit/not_real.csv", storage_options=s3so
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)
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@pytest.mark.xfail(reason="GH#39155 s3fs upgrade", strict=False)
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@td.skip_if_no("pyarrow")
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def test_write_s3_parquet_fails(self, tips_df, s3so):
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# GH 27679
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# Attempting to write to an invalid S3 path should raise
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import botocore
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# GH 34087
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# https://boto3.amazonaws.com/v1/documentation/api/latest/guide/error-handling.html
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# Catch a ClientError since AWS Service Errors are defined dynamically
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error = (FileNotFoundError, botocore.exceptions.ClientError)
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with pytest.raises(error, match="The specified bucket does not exist"):
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tips_df.to_parquet(
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"s3://an_s3_bucket_data_doesnt_exit/not_real.parquet",
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storage_options=s3so,
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)
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def test_read_csv_handles_boto_s3_object(self, s3_resource, tips_file):
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# see gh-16135
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s3_object = s3_resource.meta.client.get_object(
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Bucket="pandas-test", Key="tips.csv"
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)
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result = read_csv(BytesIO(s3_object["Body"].read()), encoding="utf8")
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assert isinstance(result, DataFrame)
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assert not result.empty
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expected = read_csv(tips_file)
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tm.assert_frame_equal(result, expected)
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def test_read_csv_chunked_download(self, s3_resource, caplog, s3so):
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# 8 MB, S3FS usees 5MB chunks
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import s3fs
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df = DataFrame(np.random.randn(100000, 4), columns=list("abcd"))
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str_buf = StringIO()
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df.to_csv(str_buf)
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buf = BytesIO(str_buf.getvalue().encode("utf-8"))
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s3_resource.Bucket("pandas-test").put_object(Key="large-file.csv", Body=buf)
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# Possibly some state leaking in between tests.
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# If we don't clear this cache, we saw `GetObject operation: Forbidden`.
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# Presumably the s3fs instance is being cached, with the directory listing
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# from *before* we add the large-file.csv in the pandas-test bucket.
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s3fs.S3FileSystem.clear_instance_cache()
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with caplog.at_level(logging.DEBUG, logger="s3fs"):
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read_csv("s3://pandas-test/large-file.csv", nrows=5, storage_options=s3so)
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# log of fetch_range (start, stop)
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assert (0, 5505024) in (x.args[-2:] for x in caplog.records)
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def test_read_s3_with_hash_in_key(self, tips_df, s3so):
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# GH 25945
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result = read_csv("s3://pandas-test/tips#1.csv", storage_options=s3so)
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tm.assert_frame_equal(tips_df, result)
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@td.skip_if_no("pyarrow")
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def test_read_feather_s3_file_path(self, feather_file, s3so):
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# GH 29055
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expected = read_feather(feather_file)
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res = read_feather(
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"s3://pandas-test/simple_dataset.feather", storage_options=s3so
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)
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tm.assert_frame_equal(expected, res)
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