How to Create a Tuple in Python? (Constructor, Singleton) - Python Tutorial for Beginners

Veröffentlicht am: 29 März 2021
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🖥️ How to Create a Tuple in Python? (Constructor, Singleton)

Unlike Lists in Python, Tuples are defined by enclosing the elements in parentheses () - instead of square brackets [].

my_tuple = ("Learn", "Python", "with", "Digital Academy", 1, 2, 3)

You can create a tuple by placing a comma-separated sequence of items, in parentheses. Thus, a tuple containing zero items is called an empty tuple, and you can create one with empty parentheses. The items of a tuple do not have to be the same type. For instance, the following tuples contain integers, strings, float, or boolean values.

Empty tuple
my_tuple = ()

A tuple of integers
my_tuple = (1, 2, 3)

A tuple of strings
my_tuple = ('red', 'green', 'blue')

A tuple with mixed data types
my_tuple = (1, 'abc', 1.23, True)

Syntactically, a tuple is just a comma-separated list of values. You do not necessarily need the parentheses to create a tuple. It is the trailing commas that really define a tuple. But, using parentheses does not hurt because they help make the tuple more visible.

A tuple without parentheses
my_tuple = 1, 'abc', 1.23, True

○ Singleton Tuple in Python

Since parentheses are also used to define operator precedence in expressions, Python evaluates the expression 7 as simply the integer 7, and creates an int object. To tell Python that you really want to define a singleton tuple, with only one value, include a trailing comma "," - just before the closing parenthesis.

Not a tuple
my_tuple = (7)
type(my_tuple) # type 'int'

Tuple
my_tuple = (7,)
type(my_tuple) # type 'tuple'

○ The tuple() Constructor

It is also possible to use the tuple() constructor when you want to create a tuple. And, you can convert other data types to tuple, using Python’s tuple constructor as well.

my_tuple = tuple(("apple", "banana", "cherry"))

Convert list into tuple
my_tuple = tuple([1, 2, 3])
my_tuple = (1, 2, 3)

Convert string into tuple
my_tuple = tuple('abc')
my_tuple = ('a', 'b', 'c')

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