﻿ Python: Index of the first element, which is greater than a specified element using itertools module - w3resource

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

Python Itertools: Exercise-39 with Solution

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
```

Python Code Editor:

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Python: Tips of the Day

Inverts a dictionary with non-unique hashable values:

Example:

```def tips_collect_dictionary(obj):
inv_obj = {}
for key, value in obj.items():
inv_obj.setdefault(value, list()).append(key)
return inv_obj
ages = {
"Owen": 25,
"Jhon": 25,
"Pepe": 15,
}
print(tips_collect_dictionary(ages))
```

Output:

```{25: ['Owen', 'Jhon'], 15: ['Pepe']}
```

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