<div dir="ltr">For ~, I suggest either having an extra bit on the object that remembers negation or replacing the patterns a &= ~b with a.clear_flags(b) and a & ~b with a.without_flags(b) or something like that.<div><br>On Tuesday, March 3, 2015 at 10:54:15 AM UTC-5, Serhiy Storchaka wrote:<blockquote class="gmail_quote" style="margin: 0;margin-left: 0.8ex;border-left: 1px #ccc solid;padding-left: 1ex;">Enum and IntEnum classes allow constants to have nice str() and repr() 

representations.

<br>

<br> >>> socket.AF_INET

<br><AddressFamily.AF_INET: 2>

<br> >>> socket.socket()

<br><socket.socket fd=3, family=AddressFamily.AF_INET, 

<br>type=SocketKind.SOCK_STREAM, proto=0, laddr=('0.0.0.0', 0)>

<br>

<br>But when integer constants are flags that should be ORed, IntEnum 

<br>doesn't help, because the result of bitwise OR of two IntEnum instances 

is int, and this value can't be represented as IntEnum.

<br>

<br>We need new type IntFlags. It is like IntEnum, but has differences:

<br>

<br>1. The value of an instance should be not limited to the set of 

<br>predefined constants. It can be a combination of predefined constants or 

even arbitrary integer.

<br>

<br>2. The result of "|", "&" and "~" operators for IntFlags arguments 

should be an instance of the same IntFlags subclass.

<br>

3. It should have nice str() and repr().

<br>

<br> >>> print(stat.S_IROTH | stat.S_IWOTH)

<br>stat.S_IROTH|stat.S_IWOTH

<br> >>> stat.S_IROTH | stat.S_IWOTH

<br><StatFlags.S_IROTH|S_IWOTH: 6>

<br>

Any thoughts?

<br>

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