requirements.txt parser for setup.py

gistfile1.py

def read_requirements(filename='requirements.txt'):
    """Reads the list of requirements from given file.

    :param filename: Filename to read the requirements from.
                     Uses ``'requirements.txt'`` by default.

    :return: Requirments as list of strings.
    """
    # allow for some leeway with the argument
    if not filename.startswith('requirements'):
        filename = 'requirements-' + filename
    if not os.path.splitext(filename)[1]:
        filename += '.txt'  # no extension, add default

    def valid_line(line):
        line = line.strip()
        return line and not any(line.startswith(p) for p in ('#', '-'))

    def extract_requirement(line):
        egg_eq = '#egg='
        if egg_eq in line:
            _, requirement = line.split(egg_eq, 1)
            return requirement
        return line

    with open(filename) as f:
        lines = f.readlines()
        return list(map(extract_requirement, filter(valid_line, lines)))