Modifying test to pass on old version of Python.

Removing unused imports.

Author: ppisl

graalpython/com.oracle.graal.python.test/src/tests/test_zipimport.py

@@ -100,8 +100,9 @@ def __fspath__(self):
 
         zipimport._zip_directory_cache.clear()
         mp = MyPath(ZIP_PATH)
-        z = zipimport.zipimporter(mp)
-        self.assertTrue(zipimport._zip_directory_cache[os.path.abspath(ZIP_PATH)] is not None)
+        if (sys.version_info.major >= 3 and sys.version_info.minor >= 6):
+            z = zipimport.zipimporter(mp)
+            self.assertTrue(zipimport._zip_directory_cache[os.path.abspath(ZIP_PATH)] is not None)
 
     def test_zipimporter_find_module(self):
         self.assertTrue(self.z is self.z.find_module("MyTestModule"))

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/ZipImportModuleBuiltins.java

@@ -50,7 +50,6 @@
 import com.oracle.graal.python.builtins.objects.module.PythonModule;
 import com.oracle.graal.python.builtins.objects.type.PythonClass;
 import com.oracle.graal.python.builtins.objects.zipimporter.PZipImporter;
-import com.oracle.graal.python.builtins.objects.zipimporter.ZipImporterBuiltins;
 import com.oracle.graal.python.nodes.attributes.ReadAttributeFromObjectNode;
 import com.oracle.graal.python.nodes.function.PythonBuiltinBaseNode;
 import com.oracle.graal.python.nodes.function.builtins.PythonBinaryBuiltinNode;

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/zipimporter/ZipImporterBuiltins.java

@@ -57,7 +57,6 @@
 import com.oracle.graal.python.nodes.object.GetLazyClassNode;
 import com.oracle.graal.python.nodes.truffle.PythonArithmeticTypes;
 import com.oracle.graal.python.runtime.exception.PythonErrorType;
-import com.oracle.graal.python.runtime.object.PythonObjectFactory;
 import com.oracle.graal.python.runtime.sequence.storage.SequenceStorage;
 import com.oracle.truffle.api.CompilerDirectives;
 import com.oracle.truffle.api.dsl.Cached;