Here's a simple Python function to calculate prime numbers using a brute-force algorithm:

```py
def is_prime(number):
    if number > 1:
        for num in range(2, int(num ** 0.5) + 1):
            if number % num == 0:
                return False
        return True
    return False

def find_primes(limit):
    primes = []
    for num in range(2, limit):
        if is_prime(num):
            primes.append(num)
    return primes
```

The `find_primes` function can be used to calculate all prime numbers up to the provided limit. Note that this method of calculating primes is not efficient and will take a while to run for large limits.
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