﻿ Python: Calculate the average of a given list, after mapping each element to a value using the provided function - w3resource

Python: Calculate the average of a given list, after mapping each element to a value using the provided function

Python List: Exercise - 238 with Solution

Write a Python program to calculate the average of a given list, after mapping each element to a value using the provided function.

• Use map() to map each element to the value returned by fn.
• Use sum() to sum all of the mapped values, divide by len(lst).
• Omit the last argument, fn, to use the default identity function.

Sample Solution:

Python Code:

``````def average_by(lst, fn = lambda x: x):
return sum(map(fn, lst), 0.0) / len(lst)

print(average_by([{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }], lambda x: x['n']))
print(average_by([{ 'n': 10 }, { 'n': 20 }, { 'n': -30 }, { 'n': 60 }], lambda x: x['n']))
```
```

Sample Output:

```5.0
15.0
```

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Python: Tips of the Day

```print(2_000_000)
```2000000