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Over 30 types of variables available in python ?

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  Over 30 types of variables available in python ? chaouche yacine <yacinechaouche@yahoo.com> - 2013-01-06 15:12 -0800
    Re: Over 30 types of variables available in python ? Duncan Booth <duncan.booth@invalid.invalid> - 2013-01-07 11:14 +0000

#36301 — Over 30 types of variables available in python ?

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booleans
ints, floats, longs, complexes
strings, unicode strings
lists, tuples, dictionaries, dictionary views, sets, frozensets, buffers, bytearrays, slices
functions, methods, code objects,modules,classes, instances, types, nulls (there is exactly one object of type Null which is None), tracebacks, frames
generators, iterators, xranges,
files,

memoryviews,
context managers,

These are all listed in this page http://docs.python.org/2/library/stdtypes.html as built-in types. Am I getting anything wrong here ? I'm a bit confused about it. I have never seen so many types in the few programming languages I saw.

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#36343

chaouche yacine <yacinechaouche@yahoo.com> wrote:

> 
> booleans
> ints, floats, longs, complexes
> strings, unicode strings
> lists, tuples, dictionaries, dictionary views, sets, frozensets,
> buffers, bytearrays, slices functions, methods, code
> objects,modules,classes, instances, types, nulls (there is exactly one
> object of type Null which is None), tracebacks, frames generators,
> iterators, xranges, files,
> 
> memoryviews,
> context managers,
> 
> These are all listed in this page
> http://docs.python.org/2/library/stdtypes.html as built-in types. Am I
> getting anything wrong here ? I'm a bit confused about it. I have
> never seen so many types in the few programming languages I saw. 

Instances aren't types (though types themselves are instances): every 
object in Python is an instance.

If you want a list of types that exist in your particular copy of Python 
then you can print it out easily enough:

------------------------------------------------
def allsubclasses(base):
    mod = base.__module__
    if mod in ('builtins', '__builtin__', 'exceptions'):
        yield getattr(base, '__qualname__', base.__name__)
    else:
        yield "{}.{}".format(base.__module__, getattr(base, 
'__qualname__', base.__name__))
    for typ in type.__subclasses__(base):
        for t in allsubclasses(typ): yield t

all_types = sorted(set(allsubclasses(object)), key=str.lower)
print(len(all_types))
print(all_types)
------------------------------------------------

That won't show any types that haven't been imported, but it gives me  
293 types that are all loaded on startup in Python 3.3 and 150 in Python 
2.7.

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