Эта статья посвящена теме декораторов в Python. Поговорим о том, что это такое, уделим особое внимание свойствам функций в Python, на базе которых реализована данная идея, а также рассмотрим декораторы, которые принимают аргументы и возвращают значение из функции.
Что надо знать о методах и функциях в Python?
Говоря о функциях в Python, нужно упомянуть два аспекта:
1) функция в Python — есть объект специального вида, который можно передавать в виде аргумента другим функциям;
2) внутри функций в Python вы можете создавать другие функции, а также вызывать их, возвращая результат посредством return.
Теперь давайте поговорим об этом подробнее.
Функция как объект в Python
В языке программирования Python часто практикуется передача одной функции в виде аргумента другой функции. Представьте, что есть список целых чисел, и вы желаете на его базе получить другой список с элементами, которые будут квадратами первого списка. Вот, как это можно реализовать в Python:
>>> # исходный список
>>> a = [1, 2, 3, 4, 5]
>>> # функция, которая возводит в квадрат переданное ей число
>>> sq = lambda x: x**2
>>> # проверка работы функции в Python
>>> print(sq(5))
25
>>> # получение списка квадратов
>>> b = list(map(sq, a))
>>> print(b)
[1, 4, 9, 16, 25]
В нашем примере мы передали функции map в виде первого аргумента функцию sq. Последняя будет по очереди применяться ко всем элементам нашего списка a.
Кроме того, в Python функция является специальным объектом, имеющим метод __call__(). Представьте, что мы создали следующий класс:
class DemoCall():
def __call__(self):
return "Hello!"
Объект такого класса в Python мы сможем вызывать как функцию:
>>> hello = DemoCall()
>>> hello()
'Hello!'
Функция внутри функции в Python
Функции в Python мы можем создавать, вызывать и возвращать из других функций. Кстати, на этом основана идея замыкания (closures) в Python.
Давайте создадим функцию, умножающую 2 числа:
def mul(a):
def helper(b):
return a * b
return helper
В этой функции в Python реализованы два важных свойства:
1) внутри функции mul() мы создаём ещё одну функцию helper();
2) функция mul() возвращает нам функцию helper() в качестве результата работы.
Вызов этой функции в Python:
Особенность заключается в том, что мы можем создавать на базе функции mul() собственные кастомизированные функции. Давайте создадим функцию в Python, умножающую на 3:
>>>three_mul = mul(3)
>>>three_mul(5)
15
В результате была построена функция three_mul(), умножающая на 3 любое переданное ей число.
Декоратор функции в Python
Конструктивно речь идёт о некоторой функции, в качестве аргумента которого выступает другая функция. Декоратор в Python добавляет дополнительный функционал к функции, не меняя её содержимое.
Создание
Представьте, что мы имеем пару простых функций в Python:
def first_test():
print("Test function 1")
def second_test():
print("Test function 2")
При этом мы желаем их дополнить таким образом, чтобы перед вызовом основного кода нашей функции печаталась строчка “Start function”, а в конце – строка “Stop function”.
Реализовать поставленную задачу можно несколькими методами. Во-первых, мы можем добавить необходимые строки в конец и начало каждой функции. Но вряд ли это удобно, ведь если мы пожелаем их убрать, придётся модифицировать тело функции.
Теперь поговорим о втором пути. Для начала создадим функцию:
def simple_decore(fn):
def wrapper():
print("Start function")
fn()
print("Stop function")
return wrapper
Теперь нужно обернуть функции в оболочку:
first_test_wrapped = simple_decore(first_test)
second_test_wrapped = simple_decore(second_test)
Обратите внимание, что функции first_test и second_test не поменялись.
>>> first_test()
Test function 1
>>> second_test()
Test function 2
Наши функции second_test_wrapped и first_test_wrapped обладают функционалом, который нам и нужен.
>>> first_test_wrapped()
Start function
Test function 1
Stop function
>>> first_test_wrapped()
Start function
Test function 1
Stop function
Теперь, если надо, чтобы так работали функции с именами first_test и second_test, делаем следующее:
first_test = first_test_wrapped
second_test = second_test_wrapped
Проверяем:
>>> first_test()
Start function
Test function 1
Stop function
>>> second_test()
Start function
Test function 2
Stop function
Выполненные нами действия и являются реализацией идеи декоратора.
Правда, вместо строк:
def first_test():
print("Test function 1")
first_test_wrapped = simple_decore(first_test)
first_test = first_test_wrapped
мы можем написать иначе:
@simple_decore
def first_test():
print("Test function 1")
В нашем случае @simple_decore – это не что иное, как декоратор функции.
Передаём аргументы в функцию с помощью декоратора
Бывает, что функция требует наличие аргумента, поэтому мы можем передать его через декоратор. Давайте создадим декоратор, принимающий аргумент и выводящий информацию о декорируемой нами функции и её аргументе.
def param_transfer(fn):
def wrapper(arg):
print("Start function: " + str(fn.__name__) + "(), with param: " + str(arg))
fn(arg)
return wrapper
Чтобы продемонстрировать работу, создадим функцию, выводящую квадратный корень переданного ей числа, а в качестве декоратора, укажем созданный param_transfer:
@param_transfer
def print_sqrt(num):
print(num**0.5)
Теперь давайте выполним данную функцию с аргументом 4:
>>> print_sqrt(4)
Start function: print_sqrt(), with param: 4
2.0
Декораторы для методов класса в Python
С декоратором можно объявлять и методы классов. Давайте выполним модификацию декоратора param_transfer:
def method_decor(fn):
def wrapper(self):
print("Start method: " + str(fn.__name__))
fn(self)
return wrapper
Теперь приступим к созданию класса для представления 2-мерного вектора (математического). В классе определим метод norm(), выводящий модуль вектора.
class Vector():
def __init__(self, px = 0, py = 0):
self.px = px
self.py = py
@method_decor
def norm(self):
print((self.px**2 + self.py**2)**0.5)
Что же, осталось продемонстрировать работу нашего метода:
>>> vc = Vector(px=10, py=5)
>>> vc.norm()
Start method: norm
11.180339887498949
Возвращаем результат работы функции через декоратор
Зачастую создаваемые функции выполняют возвращение какого-либо значения. Чтобы это стало возможным осуществить через декоратор, нужно специальным образом построить нашу внутреннюю функцию:
def decor_with_return(fn):
def wrapper(*args, **kwargs):
print("Start method: " + str(fn.__name__))
return fn(*args, **kwargs)
return wrapper
Возможно применение этого декоратора и для оборачивания функций, принимающих различные аргументы и возвращающие значение:
@decor_with_return
def calc_sqrt(val):
return val**0.5
Осталось выполнить функцию calc_sqrt() с параметром 16:
>>> tmp = calc_sqrt(16)
Start method: calc_sqrt
>>> print(tmp)
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<div class="post-info__author">Андрей Павленко</div>
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<div class="post-info__time">26.12.19 в 14:05</div>
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<h1 class="blog__h1">Функции и методы в Python: передача функции в функцию. Декоратор</h1>
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<a href="/nest/python/" class="post-info__blog" title="Python" >Python</a> →
<a href="/nest/python-art/" class="post-info__blog" title="Полезные материалы по Python" >Полезные материалы по Python</a>
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Теги: python, функция, методы, функция внутри функции, декоратор
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<p>Эта статья посвящена теме декораторов в Python. Поговорим о том, что это такое, уделим особое внимание свойствам функций в Python, на базе которых реализована данная идея, а также рассмотрим декораторы, которые принимают аргументы и возвращают значение из функции. <cut></cut></p>
<h2>Что надо знать о методах и функциях в Python?</h2>
<p>Говоря о функциях в Python, нужно упомянуть два аспекта:
1) функция в Python — есть объект специального вида, который можно передавать в виде аргумента другим функциям;
2) внутри функций в Python вы можете создавать другие функции, а также вызывать их, возвращая результат посредством return.</p>
<p>Теперь давайте поговорим об этом подробнее. </p>
<h2>Функция как объект в Python</h2>
<p>В языке программирования Python часто практикуется передача одной функции в виде аргумента другой функции. Представьте, что есть список целых чисел, и вы желаете на его базе получить другой список с элементами, которые будут квадратами первого списка. Вот, как это можно реализовать в Python:</p>
<pre><div class="codehilite"><pre><span></span>>>> # исходный список
>>> a = [1, 2, 3, 4, 5]
>>> # функция, которая возводит в квадрат переданное ей число
>>> sq = lambda x: x**2
>>> # проверка работы функции в Python
>>> print(sq(5))
25
>>> # получение списка квадратов
>>> b = list(map(sq, a))
>>> print(b)
[1, 4, 9, 16, 25]
</pre></div>
</pre>
<p>В нашем примере мы передали функции <strong>map</strong> в виде первого аргумента функцию <strong>sq</strong>. Последняя будет по очереди применяться ко всем элементам нашего списка <strong>a</strong>.</p>
<p>Кроме того, в Python функция является специальным объектом, имеющим метод <codeinline>__call__()</codeinline>. Представьте, что мы создали следующий класс:</p>
<pre><div class="codehilite"><pre><span></span>class DemoCall():
def <span class="gs">__call__</span>(self):
return "Hello!"
</pre></div>
</pre>
<p>Объект такого класса в Python мы сможем вызывать как функцию:</p>
<pre><div class="codehilite"><pre><span></span>>>> hello = DemoCall()
>>> hello()
'Hello!'
</pre></div>
</pre>
<h2>Функция внутри функции в Python</h2>
<p>Функции в Python мы можем создавать, вызывать и возвращать из других функций. Кстати, на этом основана идея замыкания (closures) в Python.</p>
<p>Давайте создадим функцию, умножающую 2 числа:</p>
<pre><div class="codehilite"><pre><span></span>def mul(a):
def helper(b):
return a * b
return helper
</pre></div>
</pre>
<p>В этой функции в Python реализованы два важных свойства:
1) внутри функции <codeinline>mul()</codeinline> мы создаём ещё одну функцию <codeinline>helper()</codeinline>;
2) функция <codeinline>mul()</codeinline> возвращает нам функцию <codeinline>helper()</codeinline> в качестве результата работы.</p>
<p>Вызов этой функции в Python:</p>
<pre><div class="codehilite"><pre><span></span>>>>mul(4)(2)
8
</pre></div>
</pre>
<p>Особенность заключается в том, что мы можем создавать на базе функции <codeinline>mul()</codeinline> собственные кастомизированные функции. Давайте создадим функцию в Python, умножающую на 3: </p>
<pre><div class="codehilite"><pre><span></span>>>>three_mul = mul(3)
>>>three_mul(5)
15
</pre></div>
</pre>
<p>В результате была построена функция <codeinline>three_mul()</codeinline>, умножающая на 3 любое переданное ей число.</p>
<h2>Декоратор функции в Python</h2>
<p>Конструктивно речь идёт о некоторой функции, в качестве аргумента которого выступает другая функция. Декоратор в Python добавляет дополнительный функционал к функции, не меняя её содержимое. </p>
<h3>Создание</h3>
<p>Представьте, что мы имеем пару простых функций в Python:</p>
<pre><div class="codehilite"><pre><span></span>def first_test():
print("Test function 1")
def second_test():
print("Test function 2")
</pre></div>
</pre>
<p>При этом мы желаем их дополнить таким образом, чтобы перед вызовом основного кода нашей функции печаталась строчка “Start function”, а в конце – строка “Stop function”.</p>
<p>Реализовать поставленную задачу можно несколькими методами. Во-первых, мы можем добавить необходимые строки в конец и начало каждой функции. Но вряд ли это удобно, ведь если мы пожелаем их убрать, придётся модифицировать тело функции.</p>
<p>Теперь поговорим о втором пути. Для начала создадим функцию:</p>
<pre><div class="codehilite"><pre><span></span>def simple_decore(fn):
def wrapper():
print("Start function")
fn()
print("Stop function")
return wrapper
</pre></div>
</pre>
<p>Теперь нужно обернуть функции в оболочку:</p>
<pre><div class="codehilite"><pre><span></span>first_test_wrapped = simple_decore(first_test)
second_test_wrapped = simple_decore(second_test)
</pre></div>
</pre>
<p>Обратите внимание, что функции <strong>first_test</strong> и <strong>second_test</strong> не поменялись.</p>
<pre><div class="codehilite"><pre><span></span>>>> first_test()
Test function 1
>>> second_test()
Test function 2
</pre></div>
</pre>
<p>Наши функции <strong>second_test_wrapped</strong> и <strong>first_test_wrapped</strong> обладают функционалом, который нам и нужен.</p>
<pre><div class="codehilite"><pre><span></span>>>> first_test_wrapped()
Start function
Test function 1
Stop function
>>> first_test_wrapped()
Start function
Test function 1
Stop function
</pre></div>
</pre>
<p>Теперь, если надо, чтобы так работали функции с именами <strong>first_test</strong> и <strong>second_test</strong>, делаем следующее:</p>
<pre><div class="codehilite"><pre><span></span>first_test = first_test_wrapped
second_test = second_test_wrapped
</pre></div>
</pre>
<p>Проверяем:</p>
<pre><div class="codehilite"><pre><span></span>>>> first_test()
Start function
Test function 1
Stop function
>>> second_test()
Start function
Test function 2
Stop function
</pre></div>
</pre>
<p>Выполненные нами действия и являются реализацией идеи декоратора. </p>
<p>Правда, вместо строк:</p>
<pre><div class="codehilite"><pre><span></span>def first_test():
print("Test function 1")
first_test_wrapped = simple_decore(first_test)
first_test = first_test_wrapped
</pre></div>
</pre>
<p>мы можем написать иначе:</p>
<pre><div class="codehilite"><pre><span></span><span class="ni">@simple_decore</span>
def first_test():
print("Test function 1")
</pre></div>
</pre>
<p>В нашем случае <codeinline>@simple_decore</codeinline> – это не что иное, как декоратор функции.</p>
<h3>Передаём аргументы в функцию с помощью декоратора</h3>
<p>Бывает, что функция требует наличие аргумента, поэтому мы можем передать его через декоратор. Давайте создадим декоратор, принимающий аргумент и выводящий информацию о декорируемой нами функции и её аргументе.</p>
<pre><div class="codehilite"><pre><span></span>def param_transfer(fn):
def wrapper(arg):
print("Start function: " + str(fn.__name__) + "(), with param: " + str(arg))
fn(arg)
return wrapper
</pre></div>
</pre>
<p>Чтобы продемонстрировать работу, создадим функцию, выводящую квадратный корень переданного ей числа, а в качестве декоратора, укажем созданный param_transfer:</p>
<pre><div class="codehilite"><pre><span></span><span class="ni">@param_transfer</span>
def print_sqrt(num):
print(num**0.5)
</pre></div>
</pre>
<p>Теперь давайте выполним данную функцию с аргументом 4:</p>
<pre><div class="codehilite"><pre><span></span>>>> print_sqrt(4)
Start function: print_sqrt(), with param: 4
2.0
</pre></div>
</pre>
<h3>Декораторы для методов класса в Python</h3>
<p>С декоратором можно объявлять и методы классов. Давайте выполним модификацию декоратора param_transfer:</p>
<pre><div class="codehilite"><pre><span></span>def method_decor(fn):
def wrapper(self):
print("Start method: " + str(fn.__name__))
fn(self)
return wrapper
</pre></div>
</pre>
<p>Теперь приступим к созданию класса для представления 2-мерного вектора (математического). В классе определим метод <codeinline>norm()</codeinline>, выводящий модуль вектора.</p>
<pre><div class="codehilite"><pre><span></span>class Vector():
def <span class="gs">__init__</span>(self, px = 0, py = 0):
self.px = px
self.py = py
<span class="ni">@method_decor</span>
def norm(self):
print((self.px**2 + self.py**2)**0.5)
</pre></div>
</pre>
<p>Что же, осталось продемонстрировать работу нашего метода:</p>
<pre><div class="codehilite"><pre><span></span>>>> vc = Vector(px=10, py=5)
>>> vc.norm()
Start method: norm
11.180339887498949
</pre></div>
</pre>
<h3>Возвращаем результат работы функции через декоратор</h3>
<p>Зачастую создаваемые функции выполняют возвращение какого-либо значения. Чтобы это стало возможным осуществить через декоратор, нужно специальным образом построить нашу внутреннюю функцию:</p>
<pre><div class="codehilite"><pre><span></span>def decor_with_return(fn):
def wrapper(*args, **kwargs):
print("Start method: " + str(fn.__name__))
return fn(*args, **kwargs)
return wrapper
</pre></div>
</pre>
<p>Возможно применение этого декоратора и для оборачивания функций, принимающих различные аргументы и возвращающие значение:</p>
<pre><div class="codehilite"><pre><span></span><span class="ni">@decor_with_return</span>
def calc_sqrt(val):
return val**0.5
</pre></div>
</pre>
<p>Осталось выполнить функцию <codeinline>calc_sqrt()</codeinline> с параметром 16:</p>
<pre><div class="codehilite"><pre><span></span>>>> tmp = calc_sqrt(16)
Start method: calc_sqrt
>>> print(tmp)
</pre></div>
</pre>
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<a class="post-info__author" href="/profile/70615/" title="Pavel">Pavel</a>
<div class="post-info__time" comment_id="740">15.02.20 в 23:39</div>
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<div class="blog-comment__text js-blog-comment-text" data-comment-id="740"><p>Как можно правильно читать код python без отступов?</p>
<p>Либо это ошибка форматирования кода при написании статьи, либо это ошибка верстки на сайте. Исправьте, пожалуйста.</p>
<p>def method_decor(fn):
def wrapper(self):
print("Start method: " + str(fn.<strong>name</strong>))
fn(self)
return wrapper</p>
<p>и т.д.</p></div>
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<a class="post-info__author" href="/profile/105703/" title="Андрей">Андрей</a>
<div class="post-info__time" comment_id="764">10.04.20 в 08:22</div>
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<div class="blog-comment__text js-blog-comment-text" data-comment-id="764"><p>Беда. Мозг сломал, пытаясь прочитать код без отступов. Плюнул, ушел.</p></div>
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<a class="post-info__author" href="/profile/20219/" title="Андрей Павленко">Андрей Павленко</a>
<div class="post-info__time" comment_id="3873">12.04.23 в 19:59</div>
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<div class="blog-comment__text js-blog-comment-text" data-comment-id="3873"><p>Исправили, спасибо</p></div>
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<div class="modal-container hide-top hide-transparent new-log-reg-container"
data-query='{"next": "/nest/post/1125/"}'
data-modal-ajax="/login-registration/"
data-modal-ajax-once="true"
data-modal-id="new-log-reg"
data-modal-hide-remove-class="hide-top,hide-transparent"
data-modal-hide-add-class="hide-transparent"
data-modal-loading="true"
data-modal-hide-add-delay-class="hide-top">
<div class="new-log-reg-loader">
<div class="new-log-reg__login">
<div class="loader loader_md loader_absolute-center ic-loader ic"></div>
</div>
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<div class="new-log-reg-wrapper js-modal-content">
<div class="new-log-reg__login"></div>
</div>
</div>
<div class="modal-container hide-top hide-transparent new-log-reg-container"
data-query='{"next": "/nest/post/1125/"}'
data-modal-ajax="/login-registration/"
data-modal-id="new-log-reg-event"
data-modal-hide-remove-class="hide-top,hide-transparent"
data-modal-hide-add-class="hide-transparent"
data-modal-loading="true"
data-modal-hide-add-delay-class="hide-top">
<div class="new-log-reg-loader">
<div class="new-log-reg__login">
<div class="loader loader_md loader_absolute-center ic-loader ic"></div>
</div>
</div>
<div class="new-log-reg-wrapper js-modal-content">
<div class="new-log-reg__login"></div>
</div>
</div>
<div class="modal-container hide" data-modal-id="restore-password">
<div class="modal-wrapper modal-wrapper_dark js-modal-wrapper">
<div class="modal new-log-reg__popup">
<div class="new-log-reg__popup-body">
<div class="modal__close new-ic new-ic-close-inverse new-log-reg__popup-close js-close-modal"></div>
<p class="new-log-reg__popup-title">Восстановление пароля</p>
<form method="post" class="js-restore-password" action="/api/restore_password.send_email">
<input type="hidden" name="csrfmiddlewaretoken" value="SmxISmtOqiwKs1YSLDV9p6bwxfn6xSpcILUJRCIuotERkymjGGgwRVy59lRjiwdS">
<div class="new-log-reg__popup-text new-log-reg__popup-text_slim">
Введите электронную почту для восстановления пароля
</div>
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<input type="email"
class="new-input new-input_full js-placeholder js-input
js-required
"
maxlength=""
name="email"
autocomplete="off"
required
placeholder="Электронная почта"
/>
<div class="new-input-error new-input-error_bottom js-validation-error hide "></div>
<div class="new-input-error new-input-error_info new-input-error_bottom hide"></div>
</div>
<div class="new-input-line js-error hide">
<span class="new-input-line__error new-log-reg__popup-error">
Пользователь с таким email не найден
</span>
</div>
<div class="new-input-line">
<button class="new-button new-button_md new-button_full new-button_blue"
type="submit">Восстановить
</button>
</div>
</form>
</div>
</div>
</div>
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<div class="modal-container hide" data-modal-id="phone_duplicate">
<div class="modal-wrapper modal-wrapper_dark js-modal-wrapper" data-no-wrapper-close="true">
<div class="modal new-log-reg__popup new-log-reg__popup-body">
<button class="new-log-reg__popup-close new-ic-close-inverse js-close-modal js-stats"
data-event="Register;double_tel_bad"
style=""></button>
<form>
<p class="new-log-reg__popup-title">
Ваш телефон уже привязан к<br/>другой учетной записи
</p>
<p class="new-log-reg__popup-text">
Ваш телефон <b><nobr class="js-phone-duplicate-phone"></nobr></b> уже
привязан к учетной записи <b><nobr class="js-phone-duplicate-acc"></nobr></b>.
Выберите учетную запись, с которой желаете продолжить работу.
Мы привяжем к ней телефон.
</p>
<input class="js-dod-phone-dup-modal-phone" type="hidden" value="" name="phone">
<div class="dod-phone-dup-modal__loader-container">
<div class="js-loader-content">
<div class="new-input-line">
<button
class="new-button new-button_md new-button_full new-button_one-line
new-button_blue-inverse js-stats js-dod-phone-dup-modal-submit"
type="submit"
data-value="1"
data-event="Register;double_tel_ok"
>
Текущий аккаунт <nobr class="js-phone-duplicate-self-acc"></nobr>
</button>
</div>
<div class="new-input-line">
<button
class="new-button new-button_md new-button_full new-button_one-line
new-button_blue js-stats js-dod-phone-dup-modal-submit"
type="submit"
data-value="0"
data-event="Register;double_tel_ok"
>
Войти в аккаунт <nobr class="js-phone-duplicate-acc"></nobr>
</button>
</div>
<div class="new-input-line js-error hide">
<span class="new-input-line__error new-log-reg__popup-error js-error-text"></span>
</div>
</div>
<div
class="js-loader loader loader_absolute-center loader_md ic ic-loader"
style="display: none;"
></div>
</div>
</form>
</div>
</div>
</div>
<div class="modal-container hide" data-modal-id="teacher-enrollment">
<div class="modal-wrapper modal-wrapper_dark js-modal-wrapper" data-no-wrapper-close="true">
<div class="modal new-log-reg__popup">
<form class="new-log-reg__popup-body js-email-terms-update js-form-in-modal"
action="/teacher/request/"
data-modal="teacher-enrollment">
<div class="modal__close new-ic new-ic-close-inverse new-log-reg__popup-close js-close-modal"></div>
<div class="new-log-reg__popup-title">
Заполните номер телефона
</div>
<div class="new-log-reg__popup-text new-log-reg__popup-text_slim">
Для отправки заявки в преподаватели заполните номер телефона
</div>
<div class="new-input-line new-input-line_slim new-input-line_relative">
<input type="text"
class="new-input new-input_full js-placeholder js-input
js-required
"
maxlength="255"
name="phone"
autocomplete="off"
data-js-mask="phone"
required
placeholder="Телефон"
/>
<div class="new-input-error new-input-error_bottom js-validation-error hide "></div>
<div class="new-input-error new-input-error_info new-input-error_bottom hide"></div>
</div>
<div class="new-input-line js-error hide">
<span class="new-input-line__error new-log-reg__popup-error js-text"></span>
</div>
<div class="new-input-line">
<button class="new-button new-button_md new-button_full new-button_blue"
type="submit">Отправить
</button>
</div>
</form>
</div>
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