atlantis414

When are Python circular imports fatal?

In your Python package, you have:

an __init__.py that designates this as a Python package
a module_a.py, containing a function action_a() that references an attribute (like a function or variable) in module_b.py, and
a module_b.py, containing a function action_b() that references an attribute (like a function or variable) in module_a.py.

This situation can introduce a circular import error: module_a attempts to import module_b, but can't, because module_b needs to import module_a, which is in the process of being interpreted.

But, sometimes Python is magic, and code that looks like it should cause this circular import error works just fine!

	"""Helper functions for working with audio files in NumPy."""
	"""some code borrowed from https://github.com/mgeier/python-audio/blob/master/audio-files/utility.py"""

	import numpy as np
	import contextlib
	import librosa
	import struct
	import soundfile

	def float_to_byte(sig):

	"""
	http://stackoverflow.com/questions/28022432/receiving-rtp-packets-after-rtsp-setup
	A demo python code that ..

	1) Connects to an IP cam with RTSP
	2) Draws RTP/NAL/H264 packets from the camera
	3) Writes them to a file that can be read with any stock video player (say, mplayer, vlc & other ffmpeg based video-players)

	Done for educative/demonstrative purposes, not for efficiency..!