How to use the revscoring.features.modifiers.max function in revscoring

def test_max():

    max_five_six_seven = modifiers.max(5, 6, 7)

    assert solve(max_five_six_seven) == 7

    assert solve(pickle.loads(pickle.dumps(max_five_six_seven))) == 7

    assert repr(max_five_six_seven) == ""

r"harvtxt",
    r"Harvcoltxt",
    r"Harvcol",
    r"Harvcolnb",
    r"Harvard citations", r"harvs",
    r"Harvp"
]
cite_templates = wikitext.revision.template_names_matching(
    "|".join(CITE_TEMPLATES), name="ptwiki.revision.cite_templates")
shortened_footnote_templates = wikitext.revision.template_names_matching(
    r"sfn", name="ptwiki.revision.shortened_footnote_templates")
all_ref_tags = shortened_footnote_templates + wikitext.revision.ref_tags
all_cite_templates = cite_templates + shortened_footnote_templates
proportion_of_templated_references = \
    all_cite_templates / max(all_ref_tags, 1)
non_templated_references = max(all_ref_tags - all_cite_templates, 0)
non_cite_templates = sub(
    wikitext.revision.templates, all_cite_templates,
    name="ptwiki.revision.non_cite_templates"
)

# Links
category_links = wikitext.revision.wikilink_titles_matching(
    r"(Category|Categoria)\s*\:", name="ptwiki.revision.category_links")

image_links = wikitext.revision.wikilink_titles_matching(
    r"(File|Ficheiro|Arquivo|Imagem?)\s*\:",
    name="ptwiki.revision.image_links")

image_templates = wikitext.revision.template_names_matching(
    r"(Scalable[ _]image|Panorama|Imagem[ _]vertical|Panorama|Panorama 2)",
    name='ptwiki.revision.image_template')

is_blp = has_birthday.and_(not_(dead))

local_wiki = [
    is_human,
    is_blp,
    aggregators.len(complete_translations),
    aggregators.len(important_label_translations),
    aggregators.len(important_description_translations),
    aggregators.len(important_complete_translations),
    references_count,
    wikimedia_references_count,
    wikimedia_references_count / modifiers.max(references_count, 1),
    external_references_count,
    external_references_count / modifiers.max(references_count, 1),
    unique_references_count,
    unique_references_count / modifiers.max(references_count, 1)
]

item_quality = wikibase.item + local_wiki

"""
Turkish Wikipedia
+++++++++++++++++
"""

from revscoring.features import wikitext
from revscoring.features.modifiers import max, sub

from . import wikipedia

cite_templates = wikitext.revision.template_names_matching(
    r"Kaynak|.*[ _]kaynağı",
    name="trwiki.revision.cite_templates")
proportion_of_templated_references = \
    cite_templates / max(wikitext.revision.ref_tags, 1)
non_templated_references = max(wikitext.revision.ref_tags - cite_templates, 0)
non_cite_templates = sub(
    wikitext.revision.templates, cite_templates,
    name="trwiki.revision.non_cite_templates"
)
infobox_templates = wikitext.revision.template_names_matching(
    r".*[ _]bilgi[ _]kutusu",
    name="trwiki.revision.infobox_templates")

# Copied (2015-10-29) from:
# https://fr.wikipedia.org/wiki/Wikip%C3%A9dia:Citez_vos_sources#R.C3.A9clamation_et_contestation_de_sources
cn_templates = wikitext.revision.template_names_matching(
    r"Kaynak[ _]belirt|Olgu|Fact|Delil",
    name="trwiki.revision.lvl1_cn_templates")

main_article_templates = wikitext.revision.template_names_matching(
    r"Ana|Anamadde",

added in this edit.

:Returns:
    float

:Example:
    ..code-block:: python

        >>> from revscoring.features import diff
        >>> list(extractor.extract(
            655097130, [diff.proportion_of_symbolic_chars_added]))
        [0.06734006734006734]
"""
added_symbolic_chars_ratio = \
    proportion_of_symbolic_chars_added / \
    modifiers.max(parent_revision.proportion_of_symbolic_chars, 0.001)
"""
Represents ratio of added symbolic characters in this edit compared to added
symbolic characters in the last edit.

:Returns:
    float

:Example:
    ..code-block:: python

        >>> from revscoring.features import parent_revision
        >>> list(extractor.extract(655097130,
                 [diff.added_symbolic_chars_ratio]))
        [0.6290819445604794]
"""

from revscoring.features import wikitext, modifiers

article = [
    wikitext.revision.chars,
    wikitext.revision.content_chars,
    wikitext.revision.ref_tags,
    (wikitext.revision.ref_tags /
     modifiers.max(wikitext.revision.content_chars, 1)),
    wikitext.revision.wikilinks,
    (wikitext.revision.wikilinks /
     modifiers.max(wikitext.revision.content_chars, 1)),
    wikitext.revision.external_links,
    (wikitext.revision.external_links /
     modifiers.max(wikitext.revision.content_chars, 1)),
    wikitext.revision.headings_by_level(2),
    (wikitext.revision.headings_by_level(2) /
     modifiers.max(wikitext.revision.content_chars, 1)),
    wikitext.revision.headings_by_level(3),
    (wikitext.revision.headings_by_level(3) /
     modifiers.max(wikitext.revision.content_chars, 1))
]

r"Harvard[_ ]citation", r"harv",
    r"harvtxt",
    r"Harvcoltxt",
    r"Harvcol",
    r"Harvcolnb",
    r"Harvard citations", r"harvs",
    r"Harvp"
]
cite_templates = wikitext.revision.template_names_matching(
    "|".join(CITE_TEMPLATES), name="ptwiki.revision.cite_templates")
shortened_footnote_templates = wikitext.revision.template_names_matching(
    r"sfn", name="ptwiki.revision.shortened_footnote_templates")
all_ref_tags = shortened_footnote_templates + wikitext.revision.ref_tags
all_cite_templates = cite_templates + shortened_footnote_templates
proportion_of_templated_references = \
    all_cite_templates / max(all_ref_tags, 1)
non_templated_references = max(all_ref_tags - all_cite_templates, 0)
non_cite_templates = sub(
    wikitext.revision.templates, all_cite_templates,
    name="ptwiki.revision.non_cite_templates"
)

# Links
category_links = wikitext.revision.wikilink_titles_matching(
    r"(Category|Categoria)\s*\:", name="ptwiki.revision.category_links")

image_links = wikitext.revision.wikilink_titles_matching(
    r"(File|Ficheiro|Arquivo|Imagem?)\s*\:",
    name="ptwiki.revision.image_links")

image_templates = wikitext.revision.template_names_matching(
    r"(Scalable[ _]image|Panorama|Imagem[ _]vertical|Panorama|Panorama 2)",

French Wikisource
+++++++++++++++++
"""

from revscoring.features import wikitext
from revscoring.features.modifiers import max
from revscoring.languages import french

from . import wikisource

local_wiki = [
    wikitext.revision.chars,
    french.stemmed.revision.stem_chars,
    (french.stemmed.revision.stem_chars /
     max(wikitext.revision.chars, 1)),
    french.dictionary.revision.dict_words / max(wikitext.revision.words, 1),
    french.dictionary.revision.dict_words /
    max(french.dictionary.revision.non_dict_words, 1)
]

pagelevel = local_wiki + wikisource.page

infobox_templates,
    cn_templates + 1,
    cn_templates / max(wikitext.revision.content_chars, 1),
    who_templates + 1,
    who_templates / max(wikitext.revision.content_chars, 1),
    main_article_templates,
    main_article_templates / max(wikitext.revision.content_chars, 1),
    (english.stemmed.revision.stem_chars /
     max(wikitext.revision.content_chars, 1)),
    log(paragraphs_without_refs_total_length + 1),
    words_to_watch_count,
    words_to_watch_count / max(wikitext.revision.words, 1),
    idioms_count,
    idioms_count / max(wikitext.revision.words, 1),
    words_to_watch_count + idioms_count,
    (words_to_watch_count + idioms_count) / max(wikitext.revision.words, 1)
]

wp10 = wikipedia.article + local_wiki
"""
Based largely on work by Morten Warncke-Wang et al.[1] and with a few

# Copied (2015-10-29) from:
# https://fr.wikipedia.org/wiki/Cat%C3%A9gorie:Mod%C3%A8le_pour_bibliographie
CITE_TEMPLATES = [
    r"Article",
    r"Chapitre",
    r"Jugement",
    r"Lien[ _]web",
    r"Loi",
    r"Ouvrage"
]
cite_templates = wikitext.revision.template_names_matching(
    "|".join(CITE_TEMPLATES),
    name="frwiki.revision.cite_templates")
proportion_of_templated_references = \
    cite_templates / max(wikitext.revision.ref_tags, 1)
non_templated_references = max(wikitext.revision.ref_tags - cite_templates, 0)
non_cite_templates = sub(
    wikitext.revision.templates, cite_templates,
    name="frwiki.revision.non_cite_templates"
)
infobox_templates = wikitext.revision.template_names_matching(
    r"^infobox",
    name="frwiki.revision.infobox_templates")

# Copied (2015-10-29) from:
# https://fr.wikipedia.org/wiki/Wikip%C3%A9dia:Citez_vos_sources#R.C3.A9clamation_et_contestation_de_sources
LVL1_CN_TEMPLATES = [r"Référence[ _]souhaitée", r"Citation[ _]nécessaire",
                     r"Référence[ _]à[ _]confirmer",
                     r"Référence[ _]nécessaire", r"Inédit"]
lvl1_cn_templates = wikitext.revision.template_names_matching(
    "|".join(LVL1_CN_TEMPLATES),