import wave

writer = wave.open( "test.wav", "w" )
writer.setnchannels( 1 )
writer.setsampwidth( 2 )        # 2 bytes = 16 bits
writer.setframerate( 42100 )
#writer.setnframes( n_frames )  # Uncomment to work around bug
writer.writeframes( b"\0"*2*4 )
writer.close()