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TST: read binary file objects with read_fwf #36735

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Sep 30, 2020
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TST: read binary file objects with read_fwf #36735

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20 changes: 20 additions & 0 deletions pandas/tests/io/parser/test_read_fwf.py
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@

from datetime import datetime
from io import BytesIO, StringIO
from pathlib import Path

import numpy as np
import pytest
Expand Down Expand Up @@ -614,3 +615,22 @@ def test_fwf_compression(compression_only, infer):

result = read_fwf(path, **kwargs)
tm.assert_frame_equal(result, expected)


def test_binary_mode():
"""
read_fwf supports opening files in binary mode.

GH 18035.
"""
data = """aas aas aas
bba bab b a"""
df_reference = pd.DataFrame(
[["bba", "bab", "b a"]], columns=["aas", "aas.1", "aas.2"], index=[0]
)
with tm.ensure_clean() as path:
Path(path).write_text(data)
with open(path, "rb") as file:
df = pd.read_fwf(file)
file.seek(0)
tm.assert_frame_equal(df, df_reference)