Add Python3 support

recipes/Python/284742_Finding_out_number_values_caller/recipe-284742.py

@@ -1,37 +1,41 @@
-import inspect,dis
+import sys
+import dis
 
 def expecting():
     """Return how many values the caller is expecting"""
-    f = inspect.currentframe()
+    f = sys._getframe(-1)
     f = f.f_back.f_back
     c = f.f_code
-    i = f.f_lasti
-    bytecode = c.co_code
-    instruction = ord(bytecode[i+3])
+    i = f.f_lasti + 2
+    if sys.version_info.major<3:
+        i += 1
+    bytecode = c.co_code.decode("latin-1")
+    instruction = ord(bytecode[i])
     if instruction == dis.opmap['UNPACK_SEQUENCE']:
-        howmany = ord(bytecode[i+4])
+        howmany = ord(bytecode[i+1])
         return howmany
     elif instruction == dis.opmap['POP_TOP']:
         return 0
     return 1
 
-def cleverfunc():
-    howmany = expecting()
-    if howmany == 0:
-        print "return value discarded"
-    if howmany == 2:
-        return 1,2
-    elif howmany == 3:
-        return 1,2,3
-    return 1
+if __name__ == '__main__':
+    def cleverfunc():
+        howmany = expecting()
+        if howmany == 0:
+            print "return value discarded"
+        if howmany == 2:
+            return 1,2
+        elif howmany == 3:
+            return 1,2,3
+        return 1
 
-def test():
-    cleverfunc()
-    x = cleverfunc()
-    print x
-    x,y = cleverfunc()
-    print x,y
-    x,y,z = cleverfunc()
-    print x,y,z
+    def test():
+        cleverfunc()
+        x = cleverfunc()
+        print(x)
+        x,y = cleverfunc()
+        print(x,y)
+        x,y,z = cleverfunc()
+        print(x,y,z)
 
-test()
+    test()