# Python: Sum a list of numbers

## Python List: Exercise - 208 with Solution

Sum a list of numbers. Write a Python program to sum the first number with the second and divide it by 2, then sum the second with the third and divide by 2, and so on.

Equation: (element 0 + element 1) / 2, (element 1 + element 2) / 2, ... etc.

**Sample Solution:**

**Python Code:**

```
#Source: shorturl.at/csxLM
def test(list1):
result = [(x + y) / 2.0 for (x, y) in zip(list1[:-1], list1[1:])]
return list(result)
nums = [1,2,3,4,5,6,7]
print("\nOriginal list:")
print(nums)
print("\nSum the said list of numbers:")
print(test(nums))
nums = [0,1,-3,3,7,-5,6,7,11]
print("\nOriginal list:")
print(nums)
print("\nSum the said list of numbers:")
print(test(nums))
```

Sample Output:

Original list: [1, 2, 3, 4, 5, 6, 7] Sum the said list of numbers: [1.5, 2.5, 3.5, 4.5, 5.5, 6.5] Original list: [0, 1, -3, 3, 7, -5, 6, 7, 11] Sum the said list of numbers: [0.5, -1.0, 0.0, 5.0, 1.0, 0.5, 6.5, 9.0]

**Pictorial Presentation: **

**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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**Previous:** Write a Python program to find the common tuples between two given lists.

**Next:** Write a Python program to count the number of groups of non-zero numbers separated by zeros of a given list of numbers.

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## Python: Tips of the Day

**Decapitalizes the first letter of a string:**

Example:

def tips_decapitalize(s, upper_rest=False): return s[:1].lower() + (s[1:].upper() if upper_rest else s[1:]) print(tips_decapitalize('PythonTips')) print(tips_decapitalize('PythonTips', True))

Output:

pythonTips pYTHONTIPS

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