conda_api.py 文件源码

def parse_spec(spec):
    """Parse a package name and version spec as conda would.

    Returns:
       ``ParsedSpec`` or None on failure
    """
    m = _spec_pat.match(spec)
    if m is None:
        return None
    pip_constraint = m.group('pc')
    if pip_constraint is not None:
        pip_constraint = pip_constraint.replace(' ', '')
    return ParsedSpec(name=m.group('name').lower(), conda_constraint=m.group('cc'), pip_constraint=pip_constraint)

# these are in order of preference. On pre-4.1.4 Windows,
# CONDA_PREFIX and CONDA_ENV_PATH aren't set, so we get to
# CONDA_DEFAULT_ENV.