class tuple([iterable])
Tuples may be constructed in a number of ways:
- Using a pair of parentheses to denote the empty tuple:
()
- Using a trailing comma for a singleton tuple:
a,
or(a,)
- Separating items with commas:
a, b, c
or(a, b, c)
- Using the
tuple()
built-in:tuple()
ortuple(iterable)
The constructor builds a tuple whose items are the same and in the same order as iterable‘s items. iterable may be either a sequence, a container that supports iteration, or an iterator object. If iterable is already a tuple, it is returned unchanged. For example, tuple('abc')
returns ('a', 'b', 'c')
and tuple( [1, 2, 3] )
returns (1, 2, 3)
. If no argument is given, the constructor creates a new empty tuple, ()
.
Note that it is actually the comma which makes a tuple, not the parentheses. The parentheses are optional, except in the empty tuple case, or when they are needed to avoid syntactic ambiguity. For example, f(a, b, c)
is a function call with three arguments, while f((a, b, c))
is a function call with a 3-tuple as the sole argument.
Tuples implement all of the common sequence operations.
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