Wave_write object from wave library confused with Wave_read object #603

[ksylvan]

Bug description

"""Demonstrate pylint bug with wave module."""

import wave
import struct

if __name__ == "__main__":
    # Create a 2-second blank WAV file
    with wave.open("blank_audio.wav", "wb") as wav_file:
        # Set parameters for a mono 16-bit 44.1kHz WAV file
        wav_file.setnchannels(1)  # Mono
        wav_file.setsampwidth(2)  # 16-bit
        wav_file.setframerate(44100)  # 44.1kHz
        wav_file.setnframes(88200)  # 2 seconds * 44100 Hz
        wav_file.setcomptype("NONE", "not compressed")

        # Create silent frame (0 for 16-bit)
        silent_frame = struct.pack("<h", 0)

        # Write all frames at once
        wav_file.writeframes(silent_frame * 88200)

    print("Successfully created blank_audio.wav")

Configuration

Command used

pylint test_bug.py

Pylint output

************* Module test_bug
test_bug.py:10:8: E1101: Instance of 'Wave_read' has no 'setnchannels' member; maybe 'getnchannels'? (no-member)
test_bug.py:11:8: E1101: Instance of 'Wave_read' has no 'setsampwidth' member; maybe 'getsampwidth'? (no-member)
test_bug.py:12:8: E1101: Instance of 'Wave_read' has no 'setframerate' member; maybe 'getframerate'? (no-member)
test_bug.py:13:8: E1101: Instance of 'Wave_read' has no 'setnframes' member; maybe 'getnframes'? (no-member)
test_bug.py:14:8: E1101: Instance of 'Wave_read' has no 'setcomptype' member; maybe 'getcomptype'? (no-member)
test_bug.py:20:8: E1101: Instance of 'Wave_read' has no 'writeframes' member (no-member)

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Your code has been rated at 0.00/10 (previous run: 0.00/10, +0.00)

Expected behavior

pylint should see that the wav_file object is a Wave_write and not a Wave_read object.

As specified in https://docs.python.org/3/library/wave.html, with the open call:

A mode of 'rb' returns a Wave_read object, while a mode of 'wb' returns a Wave_write object. If mode is omitted and a file-like object is passed as file, file.mode is used as the default value for mode.

Pylint version

pylint 3.3.6
astroid 3.3.9
Python 3.12.9 (main, Mar 17 2025, 21:36:21) [Clang 20.1.0 ]

OS / Environment

macOS 15.3.2 (24D81) Codename: Sequoia

Additional dependencies