diff --git a/lib/assets/Lib/string.py b/lib/assets/Lib/string.py
new file mode 100644
--- /dev/null
+++ b/lib/assets/Lib/string.py
@@ -0,0 +1,164 @@
+"""A collection of string constants.
+
+Public module variables:
+
+whitespace -- a string containing all ASCII whitespace
+ascii_lowercase -- a string containing all ASCII lowercase letters
+ascii_uppercase -- a string containing all ASCII uppercase letters
+ascii_letters -- a string containing all ASCII letters
+digits -- a string containing all ASCII decimal digits
+hexdigits -- a string containing all ASCII hexadecimal digits
+octdigits -- a string containing all ASCII octal digits
+punctuation -- a string containing all ASCII punctuation characters
+printable -- a string containing all ASCII characters considered printable
+
+"""
+
+import _string
+
+# Some strings for ctype-style character classification
+whitespace = ' \t\n\r\v\f'
+ascii_lowercase = 'abcdefghijklmnopqrstuvwxyz'
+ascii_uppercase = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
+ascii_letters = ascii_lowercase + ascii_uppercase
+digits = '0123456789'
+hexdigits = digits + 'abcdef' + 'ABCDEF'
+octdigits = '01234567'
+punctuation = """!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~"""
+printable = digits + ascii_letters + punctuation + whitespace
+
+# Functions which aren't available as string methods.
+
+# Capitalize the words in a string, e.g. " aBc  dEf " -> "Abc Def".
+def capwords(s, sep=None):
+    """capwords(s [,sep]) -> string
+
+    Split the argument into words using split, capitalize each
+    word using capitalize, and join the capitalized words using
+    join.  If the optional second argument sep is absent or None,
+    runs of whitespace characters are replaced by a single space
+    and leading and trailing whitespace are removed, otherwise
+    sep is used to split and join the words.
+
+    """
+    return (sep or ' ').join(x.capitalize() for x in s.split(sep))
+
+
+####################################################################
+import re as _re
+from collections import ChainMap
+
+class _TemplateMetaclass(type):
+    pattern = r"""
+    %(delim)s(?:
+      (?P<escaped>%(delim)s) |   # Escape sequence of two delimiters
+      (?P<named>%(id)s)      |   # delimiter and a Python identifier
+      {(?P<braced>%(id)s)}   |   # delimiter and a braced identifier
+      (?P<invalid>)              # Other ill-formed delimiter exprs
+    )
+    """
+
+    def __init__(cls, name, bases, dct):
+        super(_TemplateMetaclass, cls).__init__(name, bases, dct)
+        if 'pattern' in dct:
+            pattern = cls.pattern
+        else:
+            pattern = _TemplateMetaclass.pattern % {
+                'delim' : _re.escape(cls.delimiter),
+                'id'    : cls.idpattern,
+                }
+        cls.pattern = _re.compile(pattern, cls.flags | _re.VERBOSE)
+
+
+class Template(metaclass=_TemplateMetaclass):
+    """A string class for supporting $-substitutions."""
+
+    delimiter = '$'
+    idpattern = r'[_a-z][_a-z0-9]*'
+    flags = _re.IGNORECASE
+
+    def __init__(self, template):
+        self.template = template
+
+    # Search for $$, $identifier, ${identifier}, and any bare $'s
+
+    def _invalid(self, mo):
+        i = mo.start('invalid')
+        lines = self.template[:i].splitlines(keepends=True)
+        if not lines:
+            colno = 1
+            lineno = 1
+        else:
+            colno = i - len(''.join(lines[:-1]))
+            lineno = len(lines)
+        raise ValueError('Invalid placeholder in string: line %d, col %d' %
+                         (lineno, colno))
+
+    def substitute(self, *args, **kws):
+        if len(args) > 1:
+            raise TypeError('Too many positional arguments')
+        if not args:
+            mapping = kws
+        elif kws:
+            mapping = ChainMap(kws, args[0])
+        else:
+            mapping = args[0]
+        # Helper function for .sub()
+        def convert(mo):
+            # Check the most common path first.
+            named = mo.group('named') or mo.group('braced')
+            if named is not None:
+                val = mapping[named]
+                # We use this idiom instead of str() because the latter will
+                # fail if val is a Unicode containing non-ASCII characters.
+                return '%s' % (val,)
+            if mo.group('escaped') is not None:
+                return self.delimiter
+            if mo.group('invalid') is not None:
+                self._invalid(mo)
+            raise ValueError('Unrecognized named group in pattern',
+                             self.pattern)
+        return self.pattern.sub(convert, self.template)
+
+    def safe_substitute(self, *args, **kws):
+        if len(args) > 1:
+            raise TypeError('Too many positional arguments')
+        if not args:
+            mapping = kws
+        elif kws:
+            mapping = ChainMap(kws, args[0])
+        else:
+            mapping = args[0]
+        # Helper function for .sub()
+        def convert(mo):
+            named = mo.group('named') or mo.group('braced')
+            if named is not None:
+                try:
+                    # We use this idiom instead of str() because the latter
+                    # will fail if val is a Unicode containing non-ASCII
+                    return '%s' % (mapping[named],)
+                except KeyError:
+                    return mo.group()
+            if mo.group('escaped') is not None:
+                return self.delimiter
+            if mo.group('invalid') is not None:
+                return mo.group()
+            raise ValueError('Unrecognized named group in pattern',
+                             self.pattern)
+        return self.pattern.sub(convert, self.template)
+
+
+
+########################################################################
+# the Formatter class
+# see PEP 3101 for details and purpose of this class
+
+# The hard parts are reused from the C implementation.  They're exposed as "_"
+# prefixed methods of str.
+
+# The overall parser is implemented in _string.formatter_parser.
+# The field name parser is implemented in _string.formatter_field_name_split
+
+class Formatter:
+    def format(self, format_string, *args, **kwargs):
+        return format_string.format(*args, **kwargs)