Added argument reading

game.py

@@ -1,11 +1,28 @@
 from GameOfLifeLibrary import GameOfLife
 import sys
+import argparse
 
-sys.stdin = open("a.txt")
+parser = argparse.ArgumentParser()
+parser.add_argument("--file", help="File to read. Default is stdin", default='stdin')
 
-sizex, sizey, gens = (int(i) for i in input().split())
+args = parser.parse_args()
+
+use_prompt = False
+
+if not args.file == 'stdin':
+    sys.stdin = open(args.file, 'r')
+else:
+    use_prompt = True
+
+sizex, sizey, gens = (int(i) for i in input('Enter width, height and number '
+                                                'of gens splitted by whitespaces: '
+                                            if use_prompt else ''
+                                            ).split())
 
 a = GameOfLife(sizex, sizey)
+
+print('Enter field (and after that use Ctrl+D to stop input stream): ')
+
 a.parse_field([line[:-1] if line[-1] == '\n' else line for line in sys.stdin.readlines()])
 
 for i in range(gens):