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Python: Create a new empty set

Python sets: Exercise-1 with Solution

Write a Python program to create a set.

From Wikipedia,
In mathematics, a set is a collection of distinct elements. The elements that make up a set can be any kind of things: people, letters of the alphabet, numbers, points in space, lines, other geometrical shapes, variables, or even other sets. Two sets are equal if and only if they have precisely the same elements

NumPy Sets: Create a new empty set.

To create an empty set you have to use set(), not {}; the latter creates an empty dictionary, a data structure that we discuss in the next section.

Sample Solution:

Python Code:

print("Create a new set:")
x = set()
print(x)
print(type(x))
print("\nCreate a non empty set:")
n = set([0, 1, 2, 3, 4])
print(n)
print(type(n))
print("\nUsing a literal:")
a = {1,2,3,'foo','bar'}
print(type(a))
print(a)

Sample Output:

Create a new set:
set()
<class 'set'>

Create a non empty set:
{0, 1, 2, 3, 4}
<class 'set'>

Using a literal:
<class 'set'>
{1, 2, 3, 'bar', 'foo'}

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Python Code Editor:

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Next: Write a Python program to iteration over sets.

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Python: Tips of the Day

Access an Element in a Sequence Using the Reverse Index:

>>> a = 'Hello World!'
  >>> # instead of using a[len(a)-1]
  >>> a[-1]
  '!'
  >>> # in combination with slicing
  >>> a[-5:-1]
  'orld'