Find the greatest number in python

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Given a list of numbers, the task is to write a Python program to find the largest number in given list. 

Examples:

Input : list1 = [10, 20, 4]
Output : 20

Input : list2 = [20, 10, 20, 4, 100]
Output : 100

Method 1: Sort the list in ascending order and print the last element in the list. 

Python3

list1 = [10, 20, 4, 45, 99]

list1.sort()

print("Largest element is:", list1[-1])

Output

Largest element is: 99

Method 2: Using max() method 

Python3

list1 = [10, 20, 4, 45, 99]

print("Largest element is:", max(list1))

Output

Largest element is: 99

Method 3: Find max list element on inputs provided by user 

Python3

list1 = []

num = int(input("Enter number of elements in list: "))

for i in range(1, num + 1):

    ele = int(input("Enter elements: "))

    list1.append(ele)

print("Largest element is:", max(list1))

Output:

Enter number of elements in list: 4
Enter elements: 12
Enter elements: 19
Enter elements: 1
Enter elements: 99
Largest element is: 99

Method 4: Without using built-in functions in python: 

Python3

def myMax(list1):

    max = list1[0]

    for x in list1:

        if x > max:

            max = x

    return max

list1 = [10, 20, 4, 45, 99]

print("Largest element is:", myMax(list1))

Output

Largest element is: 99

Method 5: Use the max() and def functions to find the largest element in a given list. The max() function prints the largest element in the list.  

Python3

def maxelement(lst):

    print(max(lst))

lst = [20, 10, 20, 4, 100]

maxelement(lst)

Method: Using the lambda function

Python3

lst = [20, 10, 20, 4, 100]

print(max(lst, key=lambda value: int(value)) )

Method: Using reduce function

Python3

from functools import reduce

lst = [20, 10, 20, 4, 100]

largest_elem = reduce(max, lst)

print(largest_elem)

Time Complexity: O(n)

Auxiliary Space: O(1)