example.py

# Pycharm formatting, incorrect indentation after start of .format(...
url(r'^(?P<url_name>[a-z][a-z0-9_]+)/users/'
    r'(?P<username>{username_regex_pattern})/'
    r'favorite-companies/$'.format(
    username_regex_pattern=username_regex_pattern),
    views.FavoriteCompanyList.as_view(),
    name='favorite-company-list'),

# If you put the start of the regex on the next line pycharm autoformatting works properly
url(
    r'^(?P<url_name>[a-z][a-z0-9_]+)/users/'
    r'(?P<username>{username_regex_pattern})/'
    r'favorite-companies/$'.format(
        username_regex_pattern=username_regex_pattern),
    views.FavoriteCompanyList.as_view(),
    name='favorite-company-list'),