in case student's files shadow packages

Author: dmalan

setup.py

@@ -16,5 +16,5 @@
     package_dir={"": "src"},
     packages=["cs50"],
     url="https://github.com/cs50/python-cs50",
-    version="2.3.2"
+    version="2.3.3"
 )

src/cs50/__init__.py

@@ -1,11 +1,20 @@
+import os
 import sys
 
+# Save student's sys.path
+path = sys.path[:]
+
+# In case student has files that shadow packages
+sys.path = [p for p in sys.path if p not in ("", os.getcwd())]
+
+# Import cs50_*
 from .cs50 import eprint, get_char, get_float, get_int, get_string
 try:
     from .cs50 import get_long
 except:
     pass
 
+# Monkey patches
 from . import flask
 
 
@@ -32,3 +41,7 @@ def load_module(self, name):
 
 
 sys.meta_path.append(CustomImporter())
+
+
+# Restore student's sys.path
+sys.path = path