--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/env/lib/python3.9/site-packages/rdflib/compat.py	Mon Mar 22 18:12:50 2021 +0000
@@ -0,0 +1,163 @@
+"""
+Utility functions and objects to ease Python 2/3 compatibility,
+and different versions of support libraries.
+"""
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+
+import re
+import codecs
+import warnings
+
+import six
+
+
+# clean ElementTree import
+try:
+    from lxml import etree
+except ImportError:
+    try:
+        # Python 2.5
+        import xml.etree.cElementTree as etree
+    except ImportError:
+        try:
+            # Python 2.5
+            import xml.etree.ElementTree as etree
+        except ImportError:
+            try:
+                # normal cElementTree install
+                import cElementTree as etree
+            except ImportError:
+                try:
+                    # normal ElementTree install
+                    import elementtree.ElementTree as etree
+                except ImportError:
+                    raise Exception(
+                        "Failed to import ElementTree from any known place")
+
+try:
+    etree_register_namespace = etree.register_namespace
+except AttributeError:
+
+    import xml.etree.ElementTree as etreenative
+
+    def etree_register_namespace(prefix, uri):
+        etreenative._namespace_map[uri] = prefix
+
+
+def cast_bytes(s, enc='utf-8'):
+    if isinstance(s, six.text_type):
+        return s.encode(enc)
+    return s
+
+
+if six.PY3:
+    # Python 3:
+    # ---------
+
+    def ascii(stream):
+        return codecs.getreader('ascii')(stream)
+
+    def bopen(*args, **kwargs):
+        return open(*args, mode='rb', **kwargs)
+
+    long_type = int
+
+    def sign(n):
+        if n < 0:
+            return -1
+        if n > 0:
+            return 1
+        return 0
+
+else:
+    # Python 2
+    # --------
+
+    def ascii(stream):
+        return stream
+
+    bopen = open
+
+    long_type = long
+
+    def sign(n):
+        return cmp(n, 0)
+
+r_unicodeEscape = re.compile(r'(\\u[0-9A-Fa-f]{4}|\\U[0-9A-Fa-f]{8})')
+
+
+def _unicodeExpand(s):
+    return r_unicodeEscape.sub(lambda m: six.unichr(int(m.group(0)[2:], 16)), s)
+
+
+narrow_build = False
+try:
+    six.unichr(0x10FFFF)
+except ValueError:
+    narrow_build = True
+
+if narrow_build:
+    def _unicodeExpand(s):
+        try:
+            return r_unicodeEscape.sub(
+                lambda m: six.unichr(int(m.group(0)[2:], 16)), s)
+        except ValueError:
+            warnings.warn(
+                'Encountered a unicode char > 0xFFFF in a narrow python build. '
+                'Trying to degrade gracefully, but this can cause problems '
+                'later when working with the string:\n%s' % s)
+            return r_unicodeEscape.sub(
+                lambda m: codecs.decode(m.group(0), 'unicode_escape'), s)
+
+
+def decodeStringEscape(s):
+    """
+    s is byte-string - replace \ escapes in string
+    """
+
+    if not six.PY3:
+        s = s.decode('string-escape')
+    else:
+        s = s.replace('\\t', '\t')
+        s = s.replace('\\n', '\n')
+        s = s.replace('\\r', '\r')
+        s = s.replace('\\b', '\b')
+        s = s.replace('\\f', '\f')
+        s = s.replace('\\"', '"')
+        s = s.replace("\\'", "'")
+        s = s.replace('\\\\', '\\')
+
+    return s
+    # return _unicodeExpand(s) # hmm - string escape doesn't do unicode escaping
+
+
+def decodeUnicodeEscape(s):
+    """
+    s is a unicode string
+    replace ``\\n`` and ``\\u00AC`` unicode escapes
+    """
+    if not six.PY3:
+        s = s.encode('utf-8').decode('string-escape')
+        s = _unicodeExpand(s)
+    else:
+        s = s.replace('\\t', '\t')
+        s = s.replace('\\n', '\n')
+        s = s.replace('\\r', '\r')
+        s = s.replace('\\b', '\b')
+        s = s.replace('\\f', '\f')
+        s = s.replace('\\"', '"')
+        s = s.replace("\\'", "'")
+        s = s.replace('\\\\', '\\')
+
+        s = _unicodeExpand(s)  # hmm - string escape doesn't do unicode escaping
+
+    return s
+
+
+# Migration to abc in Python 3.8
+try:
+    from collections.abc import Mapping, MutableMapping
+except:
+    from collections import Mapping, MutableMapping