Refactored main. Added solution validation. Added .gitignore

.gitignore

@@ -0,0 +1,6 @@
+.*
+broken
+partial
+*.exe
+*.pyc
+*.out

main.py

@@ -4,10 +4,24 @@ import os
 import subprocess
 import re
 import sys
+from argparse import ArgumentParser 
+
+SOLUTIONS = '.solutions.txt'
 
 exs = ['py', 'exe']
 sol_pattern = re.compile(r'(\d+)_.+\.(?:{})'.format('|'.join(exs)))
 
+matches = map(sol_pattern.fullmatch, os.listdir('.'))
+fs = {int(m.group(1)) : m.group(0) for m in matches if m != None}
+solved = sorted(fs.keys())
+
+try:
+    with open(SOLUTIONS) as f:
+        lines = (line.split() for line in f.read().rstrip().split('\n'))
+    solutions = {int(line[0]) : ' '.join(line[1:]) for line in lines}
+except FileNotFoundError:
+    solutions = dict()
+
 try:
     subprocess.run(['pypy', '--version'],
                    stdout=subprocess.DEVNULL,
@@ -78,13 +92,8 @@ def run(fn, cmd=None):
         print(proc.stderr.decode('utf-8'), end='')
 
     return proc.stdout.decode('utf-8').rstrip().split('\n')[-1]
-    
-def main():
-    matches = map(sol_pattern.fullmatch, os.listdir('.'))
-    fs = {int(m.group(1)) : m.group(0) for m in matches if m != None}
-    solved = sorted(fs.keys())
-
-
+   
+def solve_all():
     print('Num    Solution')
     print('---------------')
     for i, x in enumerate(solved, start=1):
@@ -92,7 +101,30 @@ def main():
 
         f = fs[x]
         r = run(f)
+        if x in solutions.keys() and r != solutions[x]:
+            wrong_err = 'error : wrong solution for {}, expected {}'
+            print(wrong_err.format(x, solutions[x]))
         print('{:>3d}    {}'.format(x, r))
 
+parser = ArgumentParser()
+parser.description = \
+"""Solves all Project Euler problems with provided solutions.
+   A solution is an executable or python file in the same directory as this file,
+   with a name of the format XXX_decription.[exe|py], where XXX is the number of
+   the problem.
+   The problems are available at https://projecteuler.net/"""
+
+parser.add_argument('--get-solutions',
+                    action='store_true',
+                    help='downloads solutions for user')
+
+def main():
+    args = parser.parse_args()
+    if args.get_solutions:
+        print('Fetching solutions')
+    else:
+        solve_all()
+
+
 if __name__ == '__main__':
     main()