Tuples are immutable ordered sequences of elements that are used to store collections of data. Tuples are similar to lists but cannot be changed once set. Elements within tuples can be accessed using indexes and slices, but not changed, added to, or removed like elements in lists. Common tuple functions include tuple() to convert other data types to tuples, len() to find the length of a tuple, and max() and min() to find the maximum or minimum element.
Tuples are immutable ordered sequences of elements that are used to store collections of data. Tuples are similar to lists but cannot be changed once set. Elements within tuples can be accessed using indexes and slices, but not changed, added to, or removed like elements in lists. Common tuple functions include tuple() to convert other data types to tuples, len() to find the length of a tuple, and max() and min() to find the maximum or minimum element.
Tuples are immutable ordered sequences of elements that are used to store collections of data. Tuples are similar to lists but cannot be changed once set. Elements within tuples can be accessed using indexes and slices, but not changed, added to, or removed like elements in lists. Common tuple functions include tuple() to convert other data types to tuples, len() to find the length of a tuple, and max() and min() to find the maximum or minimum element.
Tuples are immutable ordered sequences of elements that are used to store collections of data. Tuples are similar to lists but cannot be changed once set. Elements within tuples can be accessed using indexes and slices, but not changed, added to, or removed like elements in lists. Common tuple functions include tuple() to convert other data types to tuples, len() to find the length of a tuple, and max() and min() to find the maximum or minimum element.
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Python: Tuple
Tuple • Tuples are used to store multiple items in a single variable. • Tuple is one of 4 built-in data types in Python used to store collections of data, the other 3 are • List, • Set, and • Dictionary • Tuples are like lists, but their elements are fixed; that is, • once a tuple is created, one cannot add new elements, delete elements, replace elements, or reorder the elements in the tuple t1 = () # Create an empty tuple t2 = (1, 3, 5) # Create a tuple with three elements # Create a tuple from a list t3 = tuple([2 * x for x in range(1, 5)]) # Create a tuple from a string t4 = tuple("abac") # t4 is ['a', 'b', 'a', 'c'] Tuple vs List Accessing Values in Tuples in Python • Method 1: Using Positive Index var = ("Geeks", "for", "Geeks")
print("Value in Var[0] = ", var[0]) print("Value in Var[1] = ", var[1]) print("Value in Var[2] = ", var[2])
• Method 2: Using Negative Index
var = ("Geeks", "for", "Geeks")
print("Value in Var[-3] = ", var[-3]) print("Value in Var[-2] = ", var[-2]) print("Value in Var[-1] = ", var[-1]) Slicing # Accessing tuple elements using slicing my_tuple = ('p','r','o','g','r','a','m','i','z') print(my_tuple[1:4]) print(my_tuple[:-7]) print(my_tuple[7:]) print(my_tuple[:]) Changing a Tuple • Tuples are immutable. This means that elements of a tuple cannot be changed once they have been assigned but • if the element is itself a mutable data type like a list, its nested items can be changed # Changing tuple values my_tuple = (4, 2, 3, [6, 5])
# However, item of a mutable element can be changed
my_tuple[3][0] = 9 print(my_tuple)
# Tuples can be reassigned
my_tuple = ('p', 'r', 'o', 'g', 'r', 'a', 'm', 'i', 'z') print(my_tuple) Delete Tuple Elements • Removing individual tuple elements is not possible • To explicitly remove an entire tuple, just use the del statement tup = ('physics', 'chemistry', 1997, 2000); print (tup) del tup; print ("After deleting tup : ") print (tup) Basic Tuples Operations • Tuples respond to the + and * operators much like strings; they mean concatenation and repetition except that the result is a new tuple, not a string Concatenation of Tuples in Python # Code for concatenating 2 tuples
tuple1 = (0, 1, 2, 3) tuple2 = ('python', 'geek')
# Concatenating above two
print(tuple1 + tuple2) Nesting of Tuples # Code for creating nested tuples
tuple1 = (0, 1, 2, 3) tuple2 = ('python', 'geek') tuple3 = (tuple1, tuple2) print(tuple3) Repetition Tuples # Code to create a tuple with repetition
tuple3 = ('python',)*3 print(tuple3) Finding Length of a Tuple # Code for printing the length of a tuple
tuple2 = ('python', 'geek')
print(len(tuple2)) Converting list to a Tuple # Code for converting a list and a string into a tuple
list1 = [0, 1, 2] print(tuple(list1)) print(tuple('python')) # string 'python' Obtain a list from a tuple
tuple2 = tuple([7, 1, 2, 23, 4, 5])
list1 = list(tuple2) Tuples in a loop # python code for creating tuples in a loop
tup = ('geek',) n = 5 # Number of time loop runs for i in range(int(n)): tup = (tup,) print(tup) No Enclosing Delimiters • Any set of multiple objects, comma-separated, written without identifying symbols, i.e., brackets for lists, parentheses for tuples, etc., default to tuples
print 'abc', -4.24e93, 18+6.6j, 'xyz';
x, y = 1, 2; print "Value of x , y : ", x,y; Built-in Tuple Functions Tuple cmp() Method • If elements are of the same type, perform the comparison and return the result. If elements are different types, check to see if they are numbers. • If numbers, perform numeric coercion if necessary and compare • If either element is a number, then the other element is "larger" (numbers are "smallest"). • Otherwise, types are sorted alphabetically by name. tuple1, tuple2 = (123, 'xyz'), (456, 'abc') print cmp(tuple1, tuple2) print cmp(tuple2, tuple1) tuple3 = tuple2 + (786,); print cmp(tuple2, tuple3) Tuple max() Method • This method returns the elements from the tuple with maximum value tuple1, tuple2 = (123, 'xyz', 'zara', 'abc'), (456, 700, 200) print "Max value element : ", max(tuple1) print "Max value element : ", max(tuple2) Tuple min() Method • This method returns the elements from the tuple with minimum value tuple1, tuple2 = (123, 'xyz', 'zara', 'abc'), (456, 700, 200) print "min value element : ", min(tuple1) print "min value element : ", min(tuple2) Tuple tuple() Method • This method returns the tuple
aList = [123, 'xyz', 'zara', 'abc']
aTuple = tuple(aList) print "Tuple elements : ", aTuple Questions • What are the differences between a list and a tuple? • How do you create a tuple from a list? • How do you create a list from a tuple? • What is wrong in the following code? t = (1, 2, 3) t.append(4) t.remove(0) t[0] = 1 • Is the following code correct? t1 = (1, 2, 3, 7, 9, 0, 5) t2 = (1, 2, 5) t1 = t2 Questions • Show the printout of the following code: t = (1, 2, 3, 7, 9, 0, 5) print(t) print(t[0]) print(t[1: 3]) print(t[-1]) print(t[ : -1]) print(t[1 : -1]) • Show the printout of the following code: t1 = (1, 2, 3, 7, 9, 0, 5) t2 = (1, 3, 22, 7, 9, 0, 5) print(t1 == t2) print(t1 != t2) print(t1 > t2) print(t1 < t2)
