# Python Exercises: Sum of all prime numbers in a list of integers

## Python Math: Exercise-94 with Solution

From Wikipedia,

A prime number (or a prime) is a natural number greater than 1 that is not a product of two smaller natural numbers. A natural number greater than 1 that is not prime is called a composite number. For example, 5 is prime because the only ways of writing it as a product, 1 Ã— 5 or 5 Ã— 1, involve 5 itself. However, 4 is composite because it is a product (2 Ã— 2) in which both numbers are smaller than 4.

Write a Python program to calculate the sum of all prime numbers in a given list of positive integers.

**Sample Data:**

([1, 3, 4, 7, 9]) -> 10

([]) -> Empty list!

([11, 37, 444]) -> 48

**Sample Solution-1:**

**Python Code:**

```
def test(nums):
if len(nums) > 0:
return sum(list(filter(lambda x: (x > 1 and all(x % y != 0 for y in range(2, x))), nums)))
return "Empty list!"
nums = [1, 3, 4, 7, 9]
print("Original list:")
print(nums)
print("Sum of all prime numbers in the said list of numbers:")
print(test(nums))
nums = []
print("\nOriginal list:")
print(nums)
print("Sum of all prime numbers in the said list of numbers:")
print(test(nums))
nums = [11, 37, 444]
print("\nOriginal list:")
print(nums)
print("Sum of all prime numbers in the said list of numbers:")
print(test(nums))
```

Sample Output:

Original list: [1, 3, 4, 7, 9] Sum of all prime numbers in the said list of numbers: 10 Original list: [] Sum of all prime numbers in the said list of numbers: Empty list! Original list: [11, 37, 444] Sum of all prime numbers in the said list of numbers: 48

**Flowchart:**

## Visualize Python code execution:

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

**Sample Solution-2:**

**Python Code:**

```
def test(nums):
if len(nums) > 0:
e = lambda a: 2 in [a, 2**a%a]
return sum(filter(e, nums))
else:
return "Empty list!"
nums = [1, 3, 4, 7, 9]
print("Original list:")
print(nums)
print("Sum of all prime numbers in the said list of numbers:")
print(test(nums))
nums = []
print("\nOriginal list:")
print(nums)
print("Sum of all prime numbers in the said list of numbers:")
print(test(nums))
nums = [11, 37, 444]
print("\nOriginal list:")
print(nums)
print("Sum of all prime numbers in the said list of numbers:")
print(test(nums))
```

Sample Output:

Original list: [1, 3, 4, 7, 9] Sum of all prime numbers in the said list of numbers: 10 Original list: [] Sum of all prime numbers in the said list of numbers: Empty list! Original list: [11, 37, 444] Sum of all prime numbers in the said list of numbers: 48

**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:**

**Have another way to solve this solution? Contribute your code (and comments) through Disqus.**

**Previous Python Exercise:** Rearrange the digits of a number.

**Next Python Exercise:** File Exercises Home.

**What is the difficulty level of this exercise?**

Test your Programming skills with w3resource's quiz.

## Python: Tips of the Day

**Getting sorted iterable (can sort by "compare" function):**

>>> a = [1, 2, -3] >>> sorted(a) [-3, 1, 2] >>> sorted(a,key=abs) [1, 2, -3]

**Exercises: Weekly Top 16 Most Popular Topics**- SQL Exercises, Practice, Solution - JOINS
- SQL Exercises, Practice, Solution - SUBQUERIES
- JavaScript basic - Exercises, Practice, Solution
- Java Array: Exercises, Practice, Solution
- C Programming Exercises, Practice, Solution : Conditional Statement
- HR Database - SORT FILTER: Exercises, Practice, Solution
- C Programming Exercises, Practice, Solution : String
- Python Data Types: Dictionary - Exercises, Practice, Solution
- Python Programming Puzzles - Exercises, Practice, Solution
- C++ Array: Exercises, Practice, Solution
- JavaScript conditional statements and loops - Exercises, Practice, Solution
- C# Sharp Basic Algorithm: Exercises, Practice, Solution
- Python Lambda - Exercises, Practice, Solution
- Python Pandas DataFrame: Exercises, Practice, Solution
- Conversion Tools
- JavaScript: HTML Form Validation