returns current requirements.txt versions

gistfile1.txt

import pkg_resources, os

def requirements_versions(req_file=None):
	path = req_file
	if path and not os.path.exists(path) or not path:
		path = 'base_requirements.txt'
	elif not os.path.exists(path):
		path = 'req.txt'
	elif not os.path.exists(path):
		return None

	packages = []
	req_file = open(path, 'r')
	for line in req_file.readlines():
		if line.startswith('-i'):
			continue
		try:
			line = line[:line.index('==')]
		except ValueError:
			try:
				line = line[:line.index('\n')]
			except:
				pass
		packages.append(line)

	reqs = []
	for pkg in packages:
		reqs.append("{0}=={1}\n".format(pkg, pkg_resources.get_distribution(pkg).version))
	return "".join(reqs)