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