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This method tries to determine the requirements of a particular project
by inspecting the possible places that they could be defined.
It will attempt, in order:
1) to parse setup.py in the root for an install_requires value
2) to read a requirements.txt file or a requirements.pip in the root
3) to read all .txt files in a folder called 'requirements' in the root
4) to read files matching "*requirements*.txt" and "*reqs*.txt" in the root,
excluding any starting or ending with 'test'
If one of these succeeds, then a list of pkg_resources.Requirement's
will be returned. If none can be found, then a RequirementsNotFound
will be raised
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