Python Program – Print the count of either peaks or valleys from a list

When it is required to print the count of either peaks or valleys from a list, a simple iteration and a specific condition is placed.

Below is a demonstration of the same −

Example

 Live Demo

my_list = [11,12, 24, 12, 36, 17, 28, 63]

print("The list is :")
print(my_list)

my_result = 0

for index in range(1, len(my_list) - 1):
   if my_list[index + 1] > my_list[index] < my_list[index - 1] or my_list[index + 1] <    my_list[index] > my_list[index - 1]:
      my_result += 1

print("The result is :")
print(my_result)

Output

The list is :
[11, 12, 24, 12, 36, 17, 28, 63]
The result is :
4

Explanation

• A list is defined and is displayed on the console.

• An integer variable is initialized to 0.

• The list is iterated over, and the consecutive indices are checked to see if they are less than or greater than each other.

• If so, the integer is incremented by 1.

• This is displayed as output on the console.

AmitDiwan

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Updated on: 04-Sep-2021

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