Tuples are an ordered sequences of items, just like lists. The main difference between tuples and lists is that tuples cannot be changed (immutable) unlike lists which can (mutable).
# Way 1
emptyTuple = ()
You can also initialize an empty tuple by using the
# Way 2
emptyTuple = tuple()
A tuple with values can be initialized by making a sequence of values separated by commas.
# way 1 z = (3, 7, 4, 2) # way 2 (tuples can also can be created without parenthesis) z = 3, 7, 4, 2
It is important to keep in mind that if you want to create a tuple containing only one value, you need a trailing comma after your item.
# tuple with one value >>> tup1 = ('Michael',) # tuple with one value >>> tup2 = 'Michael', # This is a string, NOT a tuple. >>> notTuple = ('Michael')
Accessing Values in Tuples
Each value in a tuple has an assigned index value. It is important to note that python is a zero indexed-based language. All this means is that the first value in the tuple is at index 0.
# Initialize a tuple >>> z = (3, 7, 4, 2) # Access the first item of a tuple at index 0 >>> print(z) 3
Python also supports negative indexing. Negative indexing starts from the end of the tuple. It can sometimes be more convenient to use negative indexing to get the last item in a tuple because you don’t have to know the length of a tuple to access the last item.
# print last item in the tuple >>> print(z[-1]) 2
Slice operations return a new tuple containing the requested items. Slices are good for getting a subset of values in your tuple. For the example code below, it will return a tuple with the items from index 0 up to and not including index 2.
# Initialize a tuple >>> z = (3, 7, 4, 2) # first index is inclusive (before the :) and last (after the :) is not. >>> print(z[0:2]) 3, 7 # everything up to but not including index 3 >>> print(z[:3]) 3, 7, 4
Tuples are Immutable
Tuples are immutable which means that after initializing a tuple, it is impossible to update individual items in a tuple. As you can see in the code below, you cannot update or change the values of tuple items (this is different from Python List which are mutable).
>>> z = (3, 7, 4, 2) >>> z (3, 7, 4, 2) >>> z = 1 Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: 'tuple' object does not support item assignment
Even though tuples are immutable, it is possible to take portions of existing tuples to create new tuples as the following example demonstrates.
# Initialize tuple tup1 = ('Python', 'SQL') # Initialize another Tuple tup2 = ('R',) # Create new tuple based on existing tuples new_tuple = tup1 + tup2; print(new_tuple)
Iterate through a Tuple
You can iterate through the items of a tuple by using a for loop.
>>> for item in ('lama', 'sheep', 'lama', 48): >>> print(item) lama sheep lama 48
enumerate function returns a tuple containing a count for every iteration (from start which defaults to 0) and the values obtained from iterating over a sequence:
>>> friends = ('Steve', 'Rachel', 'Michael', 'Monica') >>> for index, friend in enumerate(friends): >>> print(index,friend) 0 Steve 1 Rachel 2 Michael 3 Monica
Hence we studied in this article what is tuple in python and how to implement along with its different properties and how to iterate tuple.
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