pip_tree.py

import pkg_resources
installed_dists = {dist.project_name: dist
                   for dist in pkg_resources.working_set}


def get_installed(project_name):
    for dist in pkg_resources.working_set:
        if project_name.lower() == dist.project_name.lower():
            return dist


def print_tree(reqs, prefix='', last=False):
    for i, req in enumerate(reqs):
        last = i == len(reqs) - 1
        tr = prefix + (' └─' if last else ' ├─')

        if isinstance(req, pkg_resources.Distribution):
            _req = f'{req.project_name}=={req.version}'
        else:
            _req = req

        dist = get_installed(req.project_name)
        if dist:
            _dist = f'{dist.project_name}=={dist.version}'
            if prefix and dist not in req:
                print(f'{tr}🛑 {_req} ({_dist})')
            else:
                print(f'{tr}✅ {_req} ({_dist})')
            print_tree(dist.requires(),
                       prefix=prefix + ('  ' if last else ' │'))
        else:
            print(f'{tr}❌ {_req}')

print_tree(list(pkg_resources.working_set))