[Tutor] beginning to code
On Wed, 20 Sep 2017 03:22 am, Chris Angelico wrote:
> On Wed, Sep 20, 2017 at 2:20 AM, Steve D'Aprano
> <steve+python at pearwood.info> wrote:
>> I can only think of four operations which are plausibly universal:
>> Identity: compare two operands for identity. In this case, the type of the
>> object is irrelevant.
>> Kind: interrogate an object to find out what kind of thing it is (what class
>> or type it is). In Python we have type(obj) and isinstance(x, Type), plus a
>> slightly more specialised version issubclass.
>> Convert to a string or human-readable representation.
>> And test whether an object is truthy or falsey.
> Equality checks are also close to universal. If you ask if this list
> is equal to that timestamp, you don't get an exception, you get False.
Ah yes! Good one, and an obvious one. Asking whether two things are
equal/unequal should be universal to.
?Cheer up,? they said, ?things could be worse.? So I cheered up, and sure
enough, things got worse.