importprinter.py

class ImportPrinter(object):
    def __init__(self):
        record = set()
        self.install()
    def install(self):
        import sys
        sys.meta_path.insert(0, self)
    def find_module(self, fullname, path=None):
        record.append(fullname)
        return None
    def report(self):
        return self.record