Use the sort() method and negative indexes to write a Python program to find the second largest number in a list.

## Python program to find the second-largest number in a list

Simple example code printing the second last element. Simply just sort the given list in ascending order and get the second last element in the list.

```
list1 = [10, 20, 70, 40, 90]
# sorting the list
list1.sort()
print("Second largest element is:", list1[-2])
```

**Output**:

**Another way Removing the maximum element**

Use the set() function,** max() **& remove() function.

```
list1 = [10, 20, 70, 40, 90]
new_list = set(list1)
# removing the largest element from list1
new_list.remove(max(new_list))
print(max(new_list))
```

**Output**: 70

Here’s Another Python program to do that:

```
def second_largest(numbers):
# Check if the list has at least two elements
if len(numbers) < 2:
return "List should have at least two numbers."
# Sort the list in descending order
numbers.sort(reverse=True)
# The second largest number is the second element in the sorted list
return numbers[1]
# Example usage:
my_list = [10, 5, 8, 20, 2]
result = second_largest(my_list)
if type(result) == int:
print("The second largest number in the list is:", result)
else:
print(result)
```

In this program, we define a function called `second_largest`

that takes a list of numbers as its argument. It first checks if the list has at least two elements to ensure there’s a second largest number. Then, it sorts the list in descending order using the `sort`

method with the `reverse=True`

argument. Finally, it returns the second element of the sorted list, which is the second largest number.

The example usage at the end of the program demonstrates how to use the `second_largest`

function with a sample list. You can replace `my_list`

with your own list of numbers to find the second largest number in your data.

Comment if you have any doubts or suggestions on this Python list topic.

Note:IDE: PyCharm 2021.3.3 (Community Edition)Windows 10

Python 3.10.1All

Python Examples are in Python 3, so Maybe its different from python 2 or upgraded versions.