>>> import pywikibot
>>> from pywkibot.textlib import replace_links
>>> replace_links('foo', 'ba')
Traceback (most recent call last):
  File "<pyshell#4>", line 1, in <module>
    replace_links('foo', 'ba')
  File "C:\pwb\GIT\core\pywikibot\textlib.py", line 664, in replace_links
    replace_list[1] = pywikibot.Page(site, replace_list[1])
  File "C:\pwb\GIT\core\pywikibot\page\__init__.py", line 2031, in __init__
    super().__init__(source, title, ns)
  File "C:\pwb\GIT\core\pywikibot\page\__init__.py", line 183, in __init__
    raise Error(
pywikibot.exceptions.Error: Invalid argument type '<class 'NoneType'>' in Page initializer: None
>>> replace_links('foo', None)
Traceback (most recent call last):
  File "<pyshell#5>", line 1, in <module>
    replace_links('foo', None)
  File "C:\pwb\GIT\core\pywikibot\textlib.py", line 673, in replace_links
    raise ValueError('The "site" argument must be provided.')
ValueError: The "site" argument must be provided.
>>> replace_links('foo', 'ba')
Traceback (most recent call last):
  File "<pyshell#8>", line 1, in <module>
    replace_links('foo', 'ba')
  File "C:\pwb\GIT\core\pywikibot\textlib.py", line 664, in replace_links
    replace_list[1] = pywikibot.Page(site, replace_list[1])
  File "C:\pwb\GIT\core\pywikibot\page\__init__.py", line 2031, in __init__
    super().__init__(source, title, ns)
  File "C:\pwb\GIT\core\pywikibot\page\__init__.py", line 183, in __init__
    raise Error(
pywikibot.exceptions.Error: Invalid argument type '<class 'NoneType'>' in Page initializer: None
>>> replace_links('foo', ['baz', False])
WARNING: <pyshell#11>:1: FutureWarning: site=None is deprecated for 2 years and 8 months; use a valid site for list or tuple parameter "replace" instead.

Traceback (most recent call last):
  File "<pyshell#11>", line 1, in <module>
    replace_links('foo', ['baz', False])
  File "C:\pwb\GIT\core\pywikibot\textlib.py", line 675, in replace_links
    linktrail = site.linktrail()
AttributeError: 'NoneType' object has no attribute 'linktrail'