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# Python Data Structures and Algorithms - Recursion: Sum of a list of numbers

## Python Recursion: Exercise-1 with Solution

Write a Python program to calculate the sum of a list of numbers.

Sample Solution:

Python Code:

``````def list_sum(num_List):
if len(num_List) == 1:
return num_List
else:
return num_List + list_sum(num_List[1:])

print(list_sum([2, 4, 5, 6, 7]))
```
```

Sample Output:

```24
```

Flowchart: ## Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:

Python Code Editor:

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## Python: Tips of the Day

Maps the values of a list to a dictionary using a function, where the key-value pairs consist of the original value as the key and the result of the function as the value:

Example:

```def tips_map_dictionary(itr, fn):
ret = {}
for a in itr:
ret[a] = fn(a)
return ret
print(tips_map_dictionary([2,4,6], lambda a: a * a))
```

Output:

```{2: 4, 4: 16, 6: 36}
```

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