Python 3.7 beta previews

                                                  

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You can download and run Python 3.7.0b1, the first of four planned beta release previews:
https://www.python.org/downloads/release/python-370b1/

The new features in Python 3.7 compared to 3.6:
https://docs.python.org/dev/whatsnew/3.7.html

Discussion on the current stable release:
https://www.sololearn.com/Discuss/942832/?ref=app

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                                         Some new features of Python 3.7

New @dataclass decorator makes instantiating data classes easier in 3.7

@dataclass
class User():
 name: str
 user_id: int
 just_joined: bool=True

Instead of the common style:

class User():
def __init(self, name, user_id, just_joined=True):
 self.name = name
 self.id = user_id
 self.just_joined = just_joined

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PEP 538: Legacy C Locale Coercion:
   Python 3 series has been determining a sensible default strategy for handling the “7-bit ASCII” text encoding assumption currently implied by the use of the default C locale on non-Windows platforms. On documentation

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New Development Mode: -X dev:
   Add a new “development mode”: -X dev command line option and PYTHONDEVMODE environment variable to enable CPython’s “development mode”, introducing additional runtime checks which are too expensive to be enabled by default. See -X dev documentation for the effects of the development mode. On documentation

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PEP 564: Add new time functions with nanosecond resolution.
   With this they added six new “nanosecond” variants of existing functions to the time module: On documentation

• time.clock_gettime_ns()
• time.clock_settime_ns()
• time.monotonic_ns()
• time.perf_counter_ns()
• time.process_time_ns()
• time.time_ns()

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Changes in Python behavior:
   PEP 479 is enabled for all code in Python 3.7, meaning that StopIteration exceptions raised directly or indirectly in coroutines and generators are transformed into RuntimeError exceptions. On documentation