move Board class into "bingo" module

bingo/__init__.py

@@ -0,0 +1,27 @@
+import random
+
+class Board:
+    def __init__(self):
+        self.cols = []
+        for col in range(5):
+            n = 4 if col == 2 else 5
+            self.cols.append(random.sample(range(15 * col + 1, 15 * col + 15), n))
+        self.cols[2][2:2] = [0]
+        self.border = "+----" * 5 + "+"
+        self.called = {0}
+
+    def print(self):
+        for row in range(5):
+            if row == 0:
+                print(self.border)
+            for col in range(5):
+                caption = self.cols[col][row]
+                if caption == 0:
+                    caption = "F"
+                called = "*" if self.cols[col][row] in self.called else " "
+                print("|%s%2s%s" % (called, caption, called), end = "")
+            print("|")
+            print(self.border)
+
+    def call(self, n):
+        self.called.add(n)