Merge branch 'FixIssue18' into 'master'

fixed issue #18

Closes #18

See merge request flatland/flatland!17

flatland/envs/observations.py

@@ -492,8 +492,11 @@ class GlobalObsForRailEnv(ObservationBuilder):
         self.rail_obs = np.zeros((self.env.height, self.env.width, 16))
         for i in range(self.rail_obs.shape[0]):
             for j in range(self.rail_obs.shape[1]):
-                self.rail_obs[i, j] = np.array(
-                    list(f'{self.env.rail.get_transitions((i, j)):016b}')).astype(int)
+                bitlist = [int(digit) for digit in bin(self.env.rail.get_transitions((i, j)))[2:]]
+                bitlist = [0] * (16 - len(bitlist)) + bitlist
+                self.rail_obs[i, j] = np.array(bitlist)
+                # self.rail_obs[i, j] = np.array(
+                #     list(f'{self.env.rail.get_transitions((i, j)):016b}')).astype(int)
 
         # self.targets = np.zeros(self.env.height, self.env.width)
         # for target_pos in self.env.agents_target: