Python 2.4 tolerance

pytest/validate.py

@@ -17,6 +17,12 @@ from xdis import Bytecode, get_opcode
 
 opc = get_opcode(PYTHON_VERSION_TRIPLE, IS_PYPY)
 Bytecode = functools.partial(Bytecode, opc=opc)
+
+if PYTHON_VERSION_TRIPLE < (2, 5):
+    from cStringIO import StringIO
+else:
+    from StringIO import StringIO
+
 import six
 
 def _dis_to_text(co):
@@ -122,7 +128,7 @@ def validate_uncompyle(text, mode="exec"):
     original_text = text
 
     deparsed = code_deparse(
-        original_code, out=six.StringIO(), version=PYTHON_VERSION_TRIPLE, compile_mode=mode
+        original_code, out=StringIO(), version=PYTHON_VERSION_TRIPLE, compile_mode=mode
     )
     uncompyled_text = deparsed.text
     uncompyled_code = compile(uncompyled_text, "<string>", "exec")

test/dis-compare.py

@@ -1,16 +1,16 @@
 #!/usr/bin/env python
 # Mode: -*- python -*-
 #
-# Copyright (c) 2015, 2017 by Rocky Bernstein <rb@dustyfeet.com>
+# Copyright (c) 2015, 2017, 2022 by Rocky Bernstein <rb@dustyfeet.com>
 #
 
-
 import dis, os.path
+from xdis import PYTHON_VERSION_TRIPL< PYTHON_VERSION_STR
 
-try:
+if PYTHON_VERSION_TRIPLE < (2, 5):
+    from cStringIO import StringIO
+else:
     from StringIO import StringIO
-except ImportError:
-    from io import StringIO
 
 program =  os.path.basename(__file__)
 
@@ -22,7 +22,7 @@ Usage: %s [OPTIONS]... FILE
 usage_short = "Usage: %s [OPTIONS]... FILE" % program
 
 import uncompyle6
-from uncompyle6 import PYTHON_VERSION_STR, check_python_version
+from uncompyle6 check_python_version
 from uncompyle6.disas import disco
 
 def inst_fmt(inst):

uncompyle6/scanner.py

@@ -542,36 +542,26 @@ def get_scanner(version, is_pypy=False, show_asm=None):
     # Pick up appropriate scanner
     if version[:2] in PYTHON_VERSIONS:
         v_str = version_tuple_to_str(version, start=0, end=2, delimiter="")
-        try:
-            import importlib
+        if is_pypy:
+            import_name = "pypy%s" % v_str
+        else:
+            import_name = "scanner%s" % v_str
+
+        scan_toplevel = __import__("uncompyle6.scanners.%s" % import_name)
+        if scan_toplevel is None:
+            raise RuntimeError(
+                "Import Python version, %s, for decompilation failed"
+                % version_tuple_to_str(version)
+                )
 
         if is_pypy:
-                scan = importlib.import_module("uncompyle6.scanners.pypy%s" % v_str)
+            scanner_class_name = "ScannerPyPy%s" % v_str
         else:
-                scan = importlib.import_module("uncompyle6.scanners.scanner%s" % v_str)
-            if False:
-                print(scan)  # Avoid unused scan
-        except ImportError:
-            if is_pypy:
-                exec(
-                    "import uncompyle6.scanners.pypy%s as scan" % v_str,
-                    locals(),
-                    globals(),
-                )
-            else:
-                exec(
-                    "import uncompyle6.scanners.scanner%s as scan" % v_str,
-                    locals(),
-                    globals(),
-                )
-        if is_pypy:
-            scanner = eval(
-                "scan.ScannerPyPy%s(show_asm=show_asm)" % v_str, locals(), globals()
-            )
-        else:
-            scanner = eval(
-                "scan.Scanner%s(show_asm=show_asm)" % v_str, locals(), globals()
-            )
+            scanner_class_name = "Scanner%s" % v_str
+        scanners = scan_toplevel.scanners
+        specific_scanners_module = getattr(scanners, import_name)
+        scanner_class = getattr(specific_scanners_module, scanner_class_name)
+        scanner = scanner_class(show_asm=show_asm)
     else:
         raise RuntimeError(
             "Unsupported Python version, %s, for decompilation"

uncompyle6/scanners/scanner37.py

@@ -32,7 +32,7 @@ JUMP_OPs = opc.JUMP_OPS
 
 
 class Scanner37(Scanner37Base):
-    def __init__(self, show_asm=None, is_pypy: bool=False):
+    def __init__(self, show_asm=None, is_pypy=False):
         Scanner37Base.__init__(self, (3, 7), show_asm)
         self.is_pypy = is_pypy
         return

uncompyle6/semantics/customize37.py

@@ -381,7 +381,10 @@ def customize_for_version37(self, version):
             and opname == "CALL_FUNCTION_1"
             or not re.match(r"\d", opname[-1])
         ):
-            template = "(%c)(%p)" if node[0][0] == "lambda_body" else "%c(%p)"
+            if node[0][0] == "lambda_body":
+                template = "(%c)(%p)"
+            else:
+                template = "%c(%p)"
             self.template_engine(
                 (template, (0, "expr"), (1, PRECEDENCE["yield"] - 1)), node
             )

uncompyle6/semantics/fragments.py

@@ -64,7 +64,6 @@ The node position 0 will be associated with "import".
 # FIXME: DRY code with pysource
 
 import re
-from StringIO import StringIO
 
 from uncompyle6.semantics import pysource
 from uncompyle6 import parser
@@ -80,6 +79,11 @@ from uncompyle6.semantics.pysource import ParserError
 from xdis import iscode
 from xdis.version_info import IS_PYPY, PYTHON_VERSION_TRIPLE
 
+if PYTHON_VERSION_TRIPLE < (2, 5):
+    from cStringIO import StringIO
+else:
+    from StringIO import StringIO
+
 from uncompyle6.semantics.consts import (
     INDENT_PER_LEVEL,
     NONE,

uncompyle6/semantics/pysource.py

@@ -180,12 +180,14 @@ from uncompyle6.semantics.consts import (
 
 from uncompyle6.show import maybe_show_tree
 from uncompyle6.util import better_repr
-from StringIO import StringIO
+if PYTHON_VERSION_TRIPLE < (2, 5):
+    from cStringIO import StringIO
+else:
+    from StringIO import StringIO
 
 DEFAULT_DEBUG_OPTS = {"asm": False, "tree": False, "grammar": False}
 
 def unicode(x): return x
-from StringIO import StringIO
 
 PARSER_DEFAULT_DEBUG = {
     "rules": False,
@@ -2773,7 +2775,7 @@ def code_deparse(
     try:
         stmts = deparsed.ast
         first_stmt = stmts[0][0]
-        if version >= 3.6:
+        if (version >= (3, 6, 0)):
             if first_stmt[0] == "SETUP_ANNOTATIONS":
                 del stmts[0]
                 assert stmts[0] == "sstmt"