Python: Index of the first element, which is greater than a specified element using itertools module

Last update on March 29 2025 13:02:51 (UTC/GMT +8 hours)

39. Index of First Greater Element

Write a Python program to get the index of the first element that is greater than a specified element using the itertools module.

Sample Solution:

Python Code:

from itertools import takewhile
def first_index(l1, n):
    return len(list(takewhile(lambda x: x[1] <= n, enumerate(l1))))


nums = [12,45,23,67,78,90,100,76,38,62,73,29,83]
print("Original list:")
print(nums)
n = 73
print("\nIndex of the first element which is greater than",n,"in the said list:")
print(first_index(nums,n))
n = 21
print("\nIndex of the first element which is greater than",n,"in the said list:")
print(first_index(nums,n))
n = 80
print("\nIndex of the first element which is greater than",n,"in the said list:")
print(first_index(nums,n))
n = 55
print("\nIndex of the first element which is greater than",n,"in the said list:")
print(first_index(nums,n))

Sample Output:

Original list:
[12, 45, 23, 67, 78, 90, 100, 76, 38, 62, 73, 29, 83]

Index of the first element which is greater than 73 in the said list:
4

Index of the first element which is greater than 21 in the said list:
1

Index of the first element which is greater than 80 in the said list:
5

Index of the first element which is greater than 55 in the said list:
3

For more Practice: Solve these Related Problems:

• Write a Python program to iterate over a list and return the index of the first element that is greater than a specified target using itertools.takewhile.
• Write a Python program to create an iterator that scans through a list and finds the index of the first occurrence of an element exceeding a given value.
• Write a Python program to map a function over an iterable that returns the index of the first element satisfying a custom comparison condition.
• Write a Python program to use itertools.dropwhile to skip elements until one is found that is greater than a specified threshold, then output its index.

Python Code Editor:

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