Like this:
frappe@erpnext:~/frappe-bench$ bench console
Python 2.7.6 (default, Jun 22 2015, 18:00:18)
Type “copyright”, “credits” or “license” for more information.
IPython 5.1.0 – An enhanced Interactive Python.
? → Introduction and overview of IPython’s features.
%quickref → Quick reference.
help → Python’s own help system.
object? → Details about ‘object’, use ‘object??’ for extra details.
In [1]: frappe.reload_doc(“core”, “doctype”, “has_domain”)