Code:
import bs4
import pylinkvalidator.api from pylinkvalidator.api import crawl_with_options as crawl_opts
crawled_site = crawl_opts(["https://mysite.net/"], {"run-once": True, "progress": True, "console": True, "show-source": True, "allow-insecure-content": True, "parser": "lxml"})

returns (with IPython 3.7):
"Usage: ipykernel_launcher.py [options] URL ...
ipykernel_launcher.py: error: no such option: --allow-insecure-content
An exception has occurred, use %tb to see the full traceback.
SystemExit: 2"