tasks a-s

Task/Parallel-calculations/Python/parallel-calculations.py

@@ -0,0 +1,45 @@
+from concurrent import futures
+from math import floor, sqrt
+
+NUMBERS = [
+    112272537195293,
+    112582718962171,
+    112272537095293,
+    115280098190773,
+    115797840077099,
+    1099726829285419]
+# NUMBERS = [33, 44, 55, 275]
+
+def lowest_factor(n, _start=3):
+    if n % 2 == 0:
+        return 2
+    search_max = int(floor(sqrt(n))) + 1
+    for i in range(_start, search_max, 2):
+        if n % i == 0:
+            return i
+    return n
+
+def prime_factors(n, lowest):
+    pf = []
+    while n > 1:
+        pf.append(lowest)
+        n //= lowest
+        lowest = lowest_factor(n, max(lowest, 3))
+    return pf
+
+def prime_factors_of_number_with_lowest_prime_factor(NUMBERS):
+    with futures.ProcessPoolExecutor() as executor:
+        low_factor, number = max( (l, f) for l, f in zip(executor.map(lowest_factor, NUMBERS), NUMBERS) )
+        all_factors = prime_factors(number, low_factor)
+        return number, all_factors
+
+
+def main():
+    print( 'For these numbers:\n  ' + '\n  '.join(str(p) for p in NUMBERS) )
+    number, all_factors = prime_factors_of_number_with_lowest_prime_factor(NUMBERS)
+    print('    The one with the largest minimum prime factor is %i:' % number)
+    print('      All its prime factors in order are: %s' % all_factors)
+
+
+if __name__ == '__main__':
+    main()