In this Python program, we will learn how to find the second largest element from a given List.
There are various ways to find the second largest number from a list. In this program, we used the python built-in functions such as set(), min(), max(), sort(), reverse() or without using any built-in function.
Here is the source code of the program to find the second largest element from a given List.
In this program, we will use the sort() function to sort the elements of the given list in ascending order and get the second largest element from the list by subtracting 2 from the list length.
# Python Program to find the Second Largest Number from a List Using sort() Function
NumList = []
Number = int(input("Enter the Total Number of List Elements: "))
for i in range(1, Number + 1):
value = int(input("Enter the Value of %d Element: " %i))
NumList.append(value)
# Print the List Entered By the User
print("List: ", NumList)
NumList.sort()
print("The Second Largest Element in the Given List is: ", NumList[Number - 2])
Enter the Total Number of List Elements: 6
Enter the Value of 1 Element: 12
Enter the Value of 2 Element: 42
Enter the Value of 3 Element: 4512
Enter the Value of 4 Element: 541
Enter the Value of 5 Element: 812
Enter the Value of 6 Element: 642
List: [12, 42, 4512, 541, 812, 642]
The Second Largest Element in the Given List is: 812
In this program, we will sort() function to sort the elements of a list in ascending order and reverse() function to reverse the element of a given list from ascending to descending order and get the element of the second index position from the list.
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# Python Program to find the Second Largest Number from a List Using sort() and reverse() function
NumList = []
# Take the Input from the User
Number = int(input("Enter the Total Number of List Elements: "))
for i in range(1, Number + 1):
value = int(input("Enter the Value of %d Element: " %i))
NumList.append(value)
# Print the List Entered By the User
print("\nList: ", NumList)
NumList.sort()
NumList.reverse()
print("\nThe Second Largest Element in the Given List is: ", NumList[1])
Enter the Total Number of List Elements: 6
Enter the Value of 1 Element: 123
Enter the Value of 2 Element: 524
Enter the Value of 3 Element: 654
Enter the Value of 4 Element: 458
Enter the Value of 5 Element: 253
Enter the Value of 6 Element: 456
List: [123, 524, 654, 458, 253, 456]
The Second Largest Element in the Given List is: 524
In this program, we will use the set() function to get the unique element from the list to a new list. And max() to get the largest element from the list.
# Python Program to find the Second Largest Number from a List Using set() and max() Function
NumList = []
# To Take the Input From the User
Number = int(input("Enter the Total Number of List Elements: "))
for i in range(1, Number + 1):
value = int(input("Enter the Value of %d Element: " %i))
NumList.append(value)
# Print the List Entered By the User
print("\nList: ", NumList)
# To get unique elements
new_list = set(NumList)
# Removing the largest element from list1
new_list.remove(max(new_list))
# Now computing the max element by built-in method
print("\nThe Second Largest Element in the Given List is: ", max(new_list))
Enter the Total Number of List Elements: 6
Enter the Value of 1 Element: 524
Enter the Value of 2 Element: 653
Enter the Value of 3 Element: 422
Enter the Value of 4 Element: 685
Enter the Value of 5 Element: 463
Enter the Value of 6 Element: 659
List: [524, 653, 422, 685, 463, 659]
The Second Largest Element in the Given List is: 659
In this python program, we will use the Python built-in function max() and min(). max() function is used to get the largest element of a list and min() function is used to get the smallest element of a list.
Python Program to find the Second Largest Number from a List using max() and min() function
# Python Program to find the Second Largest Number from a List using max() and min() function
NumList = []
# To Take the Input From the User
Number = int(input("Enter the Total Number of List Elements: "))
for i in range(1, Number + 1):
value = int(input("Enter the Value of %d Element: " %i))
NumList.append(value)
# Print the List Entered By the User
print("\nList: ", NumList)
# Assuming max_ is equal to maximum of element at 0th and 1st index
# and secondmax is the minimum among them
max_=max(NumList[0],NumList[1])
secondmax=min(NumList[0],NumList[1])
for i in range(2,len(NumList)):
# if found element is greater than max_
if NumList[i]>max_:
secondmax=max_
max_=NumList[i]
#if found element is greator than secondmax
else:
if NumList[i]>secondmax:
secondmax=NumList[i]
print("\nThe Second Largest number in the Given list is: ",str(secondmax))
Enter the Total Number of List Elements: 6
Enter the Value of 1 Element: 456
Enter the Value of 2 Element: 23
Enter the Value of 3 Element: 654
Enter the Value of 4 Element: 52
Enter the Value of 5 Element: 566
Enter the Value of 6 Element: 245
List: [456, 23, 654, 52, 566, 245]
The Second Largest number in the Given list is: 566
In this program, we are not using any python built-in function.
Python Program to find the Second Largest Number from a List Without Using any built-in Function
# Python Program to find the Second Largest Number from a List Without Using any built-in Function
NumList = []
# take the Input From the User
Number = int(input("Enter the Total Number of List Elements: "))
for i in range(1, Number + 1):
value = int(input("Enter the Value of %d Element: " %i))
NumList.append(value)
# Print the List Entered By the User
print("\nList: ", NumList)
first = second = NumList[0]
for j in range(1, Number):
if(NumList[j] > first):
second = first
first = NumList[j]
elif(NumList[j] > second and NumList[j] < first):
second = NumList[j]
print("\nThe Largest Element in this List is: ", first)
print("The Second Largest Element in this List is: ", second)
Enter the Total Number of List Elements: 6
Enter the Value of 1 Element: 463
Enter the Value of 2 Element: 523
Enter the Value of 3 Element: 452
Enter the Value of 4 Element: 895
Enter the Value of 5 Element: 546
Enter the Value of 6 Element: 745
List: [463, 523, 452, 895, 546, 745]
The Largest Element in this List is: 895
The Second Largest Element in this List is: 745
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