add python_version36.py

Author: xianhu

README.md

@@ -31,6 +31,8 @@
 ### python_aiohttp.py: Python中最好用的异步爬虫库Aiohttp代码实例
 
 ### python_thread_multiprocess.py: Python进阶: 聊聊IO密集型任务、计算密集型任务，以及多线程、多进程
+
+### python_version36.py: Python3.6正式版要来了, 你期待哪些新特性？
 ===================================================================================================
 
 ### 您可以fork该项目,并在修改后提交Pull request

python_version36.py

@@ -0,0 +1,52 @@
+# _*_ 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:
+ 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()]