Refactor from % string formatting to f-strings (#699)

* refactored packing error messages to use f-strings

* using fstring

comtypes/tools/codegenerator/packing.py

@@ -25,20 +25,20 @@ def _calc_packing(struct, fields, pack, isStruct):
             size += a - size % a
         if isStruct:
             if size != f.offset:
-                raise PackingError("field %s offset (%s/%s)" % (f.name, size, f.offset))
+                raise PackingError(f"field {f.name} offset ({size}/{f.offset})")
             size += s
         else:
             size = max(size, s)
         total_align = max(total_align, a)
     if total_align != struct.align:
-        raise PackingError("total alignment (%s/%s)" % (total_align, struct.align))
+        raise PackingError(f"total alignment ({total_align}/{struct.align})")
     a = total_align
     if pack is not None:
         a = min(pack, a)
     if size % a:
         size += a - size % a
     if size != struct.size:
-        raise PackingError("total size (%s/%s)" % (size, struct.size))
+        raise PackingError(f"total size ({size}/{struct.size})")
 
 
 def calc_packing(struct, fields):
@@ -55,7 +55,7 @@ def calc_packing(struct, fields):
 
             return int(pack / 8)
 
-    raise PackingError("PACKING FAILED: %s" % details)
+    raise PackingError(f"PACKING FAILED: {details}")
 
 
 class PackingError(Exception):

comtypes/tools/typedesc.py

@@ -20,12 +20,7 @@ def __init__(
         self.doc = doc
 
     def __repr__(self):
-        return "<TypeLib(%s: %s, %s, %s)>" % (
-            self.name,
-            self.guid,
-            self.major,
-            self.minor,
-        )
+        return f"<TypeLib({self.name}: {self.guid}, {self.major}, {self.minor})>"
 
 
 class Constant(object):

comtypes/viewobject.py

@@ -61,11 +61,7 @@ def __init__(self, *args, **kw):
 
     def __repr__(self):
         size = (self.sizelProposed.cx, self.sizelProposed.cy)
-        return "<ExtentInfo(mode=%s, size=%s) at %x>" % (
-            self.dwExtentMode,
-            size,
-            id(self),
-        )
+        return f"<ExtentInfo(mode={self.dwExtentMode}, size={size}) at {id(self):x}>"
 
 
 assert sizeof(tagExtentInfo) == 16, sizeof(tagExtentInfo)