Python: Index of the first element which is greater than a specified element

Last update on April 19 2025 12:58:29 (UTC/GMT +8 hours)

Index of First Element Greater Than X

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

Pictorial Presentation:

Python List: Index of the first element which is greater than a specified element.

Sample Solution:

Python Code:

# Define a function called 'first_index' that finds the index of the first element in a list 'l1' greater than a given number 'n'.
def first_index(l1, n):
    # Use the 'enumerate' function to iterate over the list 'l1' along with its indices.
    # Find the first element in the list greater than 'n' and return its index.
    return next(a[0] for a in enumerate(l1) if a[1] > n)

# Create a list 'nums' containing integer values.
nums = [12, 45, 23, 67, 78, 90, 100, 76, 38, 62, 73, 29, 83]

# Print a message indicating the original list.
print("Original list:")
print(nums)

# Set the value 'n' to 73 and print a message indicating the index of the first element greater than 'n' in the list.
n = 73
print("\nIndex of the first element which is greater than", n, "in the said list:")
print(first_index(nums, n))

# Set the value 'n' to 21 and print a message indicating the index of the first element greater than 'n' in the list.
n = 21
print("\nIndex of the first element which is greater than", n, "in the said list:")
print(first_index(nums, n))

# Set the value 'n' to 80 and print a message indicating the index of the first element greater than 'n' in the list.
n = 80
print("\nIndex of the first element which is greater than", n, "in the said list:")
print(first_index(nums, n))

# Set the value 'n' to 55 and print a message indicating the index of the first element greater than 'n' in the list.
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

Flowchart:

For more Practice: Solve these Related Problems:

Write a Python program to get the index of the first element greater than a given value after skipping the first m elements in the list.
Write a Python program to retrieve the index of the first element greater than X in a sorted list using a binary search approach.
Write a Python program to find the index of the first element greater than X in a list containing duplicate values, ignoring repeated elements.
Write a Python program to return the index of the first element greater than X from a flattened version of a nested list.

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