Change IOError to OSError

IOError is an alias of OSError (PEP 3151).
Also remove unneeded explicit inheritance of object by SignatureDatabase.

pefile.py

@@ -3120,7 +3120,7 @@ def __parse__(self, fname, data, fast_load):
         if not self.FILE_HEADER:
             raise PEFormatError("File Header missing")
 
-        # Set the image's flags according the the Characteristics member
+        # Set the image's flags according to the Characteristics member
         set_flags(self.FILE_HEADER, self.FILE_HEADER.Characteristics, image_flags)
 
         optional_header_offset = nt_headers_offset + 4 + self.FILE_HEADER.sizeof()
@@ -3232,7 +3232,7 @@ def __parse__(self, fname, data, fast_load):
             DLL_CHARACTERISTICS, "IMAGE_DLLCHARACTERISTICS_"
         )
 
-        # Set the Dll Characteristics flags according the the DllCharacteristics member
+        # Set the Dll Characteristics flags according to the DllCharacteristics member
         set_flags(
             self.OPTIONAL_HEADER,
             self.OPTIONAL_HEADER.DllCharacteristics,
@@ -3640,7 +3640,7 @@ def parse_sections(self, offset):
 
             section_flags = retrieve_flags(SECTION_CHARACTERISTICS, "IMAGE_SCN_")
 
-            # Set the section's flags according the the Characteristics member
+            # Set the section's flags according to the Characteristics member
             set_flags(section, section.Characteristics, section_flags)
 
             if section.__dict__.get(
@@ -5458,7 +5458,7 @@ def length_until_eof(rva):
 
             # If the function's RVA points within the export directory
             # it will point to a string with the forwarded symbol's string
-            # instead of pointing the the function start address.
+            # instead of pointing to the function start address.
             if symbol_address >= rva and symbol_address < rva + size:
                 forwarder_str = self.get_string_at_rva(symbol_address)
                 try:
@@ -6304,7 +6304,7 @@ def get_memory_mapped_image(self, max_virtual_address=0x10000000, ImageBase=None
         return mapped_data
 
     def get_resources_strings(self):
-        """Returns a list of all the strings found withing the resources (if any).
+        """Returns a list of all the strings found within the resources (if any).
 
         This method will scan all entries in the resources directory of the PE, if
         there is one, and will return a [] with the strings.

peutils.py

@@ -17,7 +17,7 @@
 __contact__ = "[email protected]"
 
 
-class SignatureDatabase(object):
+class SignatureDatabase:
     """This class loads and keeps a parsed PEiD signature database.
 
     Usage:
@@ -397,7 +397,7 @@ def __load(self, filename=None, data=None):
                     sig_f = urllib.request.urlopen(filename)
                     sig_data = sig_f.read()
                     sig_f.close()
-                except IOError:
+                except OSError:
                     # Let this be raised back to the user...
                     raise
             else:
@@ -407,7 +407,7 @@ def __load(self, filename=None, data=None):
                     sig_f = open(filename, "rt")
                     sig_data = sig_f.read()
                     sig_f.close()
-                except IOError:
+                except OSError:
                     # Let this be raised back to the user...
                     raise
         else: