updade from Atlas repo

16-op-overloading/vector_v6.py

@@ -264,7 +264,7 @@ class Vector:
     def __repr__(self):
         components = reprlib.repr(self._components)
         components = components[components.find('['):-1]
-        return 'Vector({})'.format(components)
+        return f'Vector({components})'
 
     def __str__(self):
         return str(tuple(self))
@@ -283,7 +283,7 @@ class Vector:
 
 # tag::VECTOR_V6_UNARY[]
     def __abs__(self):
-        return math.sqrt(sum(x * x for x in self))
+        return math.hypot(*self)
 
     def __neg__(self):
         return Vector(-x for x in self)  # <1>
@@ -313,11 +313,11 @@ class Vector:
             pos = cls.shortcut_names.find(name)
             if 0 <= pos < len(self._components):
                 return self._components[pos]
-        msg = '{.__name__!r} object has no attribute {!r}'
-        raise AttributeError(msg.format(cls, name))
+        msg = f'{cls.__name__!r} object has no attribute {name!r}'
+        raise AttributeError(msg)
 
     def angle(self, n):
-        r = math.sqrt(sum(x * x for x in self[n:]))
+        r = math.hypot(*self[n:])
         a = math.atan2(r, self[n-1])
         if (n == len(self) - 1) and (self[-1] < 0):
             return math.pi * 2 - a