python_version36.py

# # _*_ coding: utf-8 _*_
#
# """
# python_version36.py by wangxin
# """
#
# import asyncio
# import decimal
# from typing import List, Dict
#
# # Formatted string literals
# name = "Fred"
# print(f"He said his name is {name}.")  # 'He said his name is Fred.'
# print("He said his name is {name}.".format(**locals()))
#
# width = 10
# precision = 4
# value = decimal.Decimal("12.34567")
# print(f"result: {value:{width}.{precision}}")  #'result:      12.35'
#
#
# # variable annotations
# def test(a: List[int], b: int) -> int:
#     return a[0] + b
# print(test([3, 1], 2))
#
# primes: List[int] = []
# captain: str
#
# class Starship:
#     stats: Dict[str, int] = {}
#
#
# # Underscores in Numeric Literals
# a = 1_000_000_000_000_000       # 1000000000000000
# b = 0x_FF_FF_FF_FF              # 4294967295
#
# '{:_}'.format(1000000)          # '1_000_000'
# '{:_x}'.format(0xFFFFFFFF)      # 'ffff_ffff'
#
#
# # Asynchronous Generators
# async def ticker(delay, to):
#     """Yield numbers from 0 to *to* every *delay* seconds."""
#     for i in range(to):
#         yield i
#         await asyncio.sleep(delay)
#
#
# # Asynchronous Comprehensions
# result = [i async for i in aiter() if i % 2]
# result = [await fun() for fun in funcs if await condition()]