53 lines
1.2 KiB
Python
53 lines
1.2 KiB
Python
# _*_ 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()]
|