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// File: openzeppelin-solidity/contracts/token/ERC20/IERC20.sol

pragma solidity ^0.5.2;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
 * the optional functions; to access them see `ERC20Detailed`.
 */
interface IERC20 {

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#!/usr/bin/env python3.7


from abc import ABC, abstractmethod
from decimal import Decimal
from typing import NamedTuple, List, Tuple


# STUBS
def _(val):

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def make_readonly_field_for_instance(
    parent_obj, obj, template_path: str = "", extra_context: dict = None
) -> callable:
    """
    Dynamically creating new read-only fields for ModelAdmin classes
    :param parent_obj: Models instance from admin class
    :param obj: The object for which we are creating the field
    :param template_path: Template for rendering
    :param extra_context: dynamic context
    :return: callable

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order = (
    Order.objects
    .select_related("patient", "client")
    .prefetch_related(
        "orderstep_order__orderstepmisc_orderstep__misc",
        "orderstep_order__orderstepjob_orderstep"
    )
    .annotate(orderstep_order__row_number=number_subquery)
    .filter(pk=pk)

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# models.py

class ProductionOrder(models.Model):

    step = models.OneToOneField(
        "order.OrderStep",
        on_delete=models.DO_NOTHING,
        verbose_name=_("Step"),
        related_name="po_productionorder",
    )

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def get_jobs_queryset(self) -> QuerySet:
    """
    Get QuerySet from production.Job (for subquery in ProductionOrderJob queryset)
    :return: QuerySet
    """
    return apps.get_model("production.Job").objects.filter(
        (
            Q(version_end_date__gt=OuterRef("production_order__created_at"))
            | Q(version_end_date__isnull=True)

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def when_conditions(when_year, when_month, then_val: Any = 1):
    return When(
        Q(
            created_at__month=when_month,
            created_at__year=when_year,
            finish_at__isnull=True,
        )
        | Q(
            finish_at__month=when_month,
            finish_at__year=when_year,

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# Запрос:
company_subquery = (
    Order.objects_clear.annotate(
        company_pk=F("client__company_id"),
        company=Coalesce(
            F("client__company__alias"), F("client__company__name")
        ),
    )
)
company_name_subquery = company_subquery.values("company")[:1]

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        when__critical_status = When(
            Q(orderstep_order__deadline__isnull=False)
            & Q(orderstep_order__deadline__gte=timezone.now())
            & Q(orderstep_order__deadline__lte=timezone.now() + timedelta(hours=4)),
            then=Val("critical")
        )

        when__need_attention_status = When(
            Q(orderstep_order__deadline__isnull=False)
            & Q(orderstep_order__deadline__gte=timezone.now() + timedelta(hours=4))

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# forms.py
class UserForm(forms.ModelForm):
    """A form for users. Includes password field."""

    password = forms.CharField(
        label="Password", widget=forms.PasswordInput(), required=False
    )
    email = MultiEmailField(
        widget=MultiEmailWidget(), required=False, help_text=help_text_for_email
    )