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# _*_ coding: utf-8 _*_

"""

python_version36.py by xianhu

"""

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(object):

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()]