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import unittest

def coalesce(*args):
    for a in args:
        if a is not None:
            return a
    else:
        raise ValueError("No values found to return")

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class EnvironmentVariable:
    """A descriptor that helps fetching environment variables.

    To be used like

        class Environment:
            LOG_LEVEL = EnvironmentVariable(default="INFO")
            CONFIG_PATH = EnvironmentVariable(is_required=True)

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"""Descriptors & Decorators
Example 2: A decorator that changes the signature of the function.
"""
from functools import wraps


class DomainObject:
    """Dummy object that requires the common parameters for processing"""
    def __init__(self, *args):
        self.args = args

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"""An example of a descriptor with a ``__delete__()`` method.
The code is for illustration purposes only, and it does not correspond to any
actual implementation.
"""


class ProtectedAttribute:
    """A class attribute that can be protected against deletion"""

    def __set_name__(self, owner, name):

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"""Mutable objects as class attributes."""
import logging

logger = logging.getLogger(__name__)


class Query:
    PARAMETERS = {"limit": 100, "offset": 0}

    def run_query(self, query, limit=None, offset=None):

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"""A small script to find all months that have a Monday 25th for a particular
year.
Input: year in format YYYY
Output: print list of dates that are a Monday 25 in that year
"""
import re
import sys
from typing import Iterator
from datetime import date

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gRPC Python: Instructions for Local Development

Note: The compilation of the C files (make) requires GCC version 7. Maybe LLVM?

1. Git clone & init the project

git clone ...
git submodule update --init

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Aio gRPC

A Proposal from the user's perspective

As a user, to use the new implementation of gRCP in the asynchronous version, I will compile by passing a specific flag:

$ python -m grpc_tools.protoc -I. --python_out=. --grpc_python_out=. proto/echo.proto --aiogrpc

This compiles the stubs, generated with the asynchronous code.

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"""Code for the talk "Discovering Descriptors"
> PyCon CZ 2017 - 8 to 10 June - Prage, Czech Republic
June 9th, 2017 11:00 CET

> EuroPython 2017 - 9 to 16 July - Rimini, Italy
July 11th, 2017 15:45 CET
https://ep2017.europython.eu/conference/talks/discovering-descriptors

Python 3.6

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// Run PostgreSQL server:
//  docker run -e POSTGRES_PASSWORD="" -p 5432:5432 postgres
// Monitor running processes:
//   watch -n 1 'echo "select pid,query_start,state,query from pg_stat_activity;" | psql -h localhost -U postgres
//
// For all handlers, call to db takes 5 seconds,
// 
// Three endpoints:
//  - "/" - take 5 seconds
//  - "/ctx" - take 1 seconds, due to 1 second cancellation policy