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Python – Find the indices for k Smallest elements
• Last Updated : 11 Dec, 2019

Sometimes, while working with Python lists, we can have a problem in which we wish to find the indices for K smallest elements. This task can occur in many domains such as web development and while working with Databases. We might sometimes, require to just find the indices of them. Letâ€™s discuss a certain way to find indices of K smallest elements in list.

Using `sorted()` + lambda + list slicing

This task can be performed using the combination of above functions. In this the` sorted()`, can be used to get the container in a way which requires to get K smallest elements at front end and then the indices can be computed using list slicing.

 `# Python3 code to demonstrate working of``# Smallest K elements indices``# using sorted() + lambda + list slicing`` ` `# initialize list``test_list ``=` `[``5``, ``6``, ``10``, ``4``, ``7``, ``1``, ``19``]`` ` `# printing original list``print``(``"The original list is : "` `+` `str``(test_list))`` ` `# initialize K``K ``=` `3`` ` `# Smallest K elements indices``# using sorted() + lambda + list slicing``res ``=` `sorted``(``range``(``len``(test_list)), key ``=` `lambda` `sub: test_list[sub])[:K]`` ` `# printing result``print``(``"Indices list of min K elements is : "` `+` `str``(res))`
Output :
```The original list is : [5, 6, 10, 4, 7, 1, 19]
Indices list of min K elements is : [5, 3, 0]
```

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