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To define a one-element set you write: >>> set([1]) To define one-element tuple you write: >>> (1,) Wouldn't it be better to write: >>> tuple(1) ? To make life easy Python gives us some powerfull syntax to define some builtin types. For example: >>> [1, 2] # defines a list >>> (1, 2, 3) # defines a tuple >>> { 'a': 1, 'b': 34 } # defines a hash But some of chars [], (), {} are used in arithmetic expressions, for example: >>> x = (1 + 3) / 2 >>> p = mylist[3] >>> v = hsh['a'] and Python is clever enough to distingquish between (1 + 3) and (1, 3). Objects of type "set" and "tuple" seem to be odd, because: -- you have to use "set" to define all sets -- you have to use ugly (1,) to define a tuple For me it would be much clearer to: -- have functions set(), tuple(), list(), dictionary() for special purposes -- have some special syntax to define these types I think that Python interpreter is smart enouth to dsitinguish between arithmetic _expression_ (1) and tuple (1,), so it could probably distinguish "set" and "dictionary": >>> {'a', 'b', 'c'} # it is a set >>> {'a':1, 'b':2, 'c':3} # it is a dictionary |
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