Fix str() bug for tuple values

oslash/either.py

@@ -98,7 +98,7 @@ def __eq__(self, other) -> bool:
         return isinstance(other, Right) and self._value == other._value
 
     def __str__(self) -> str:
-        return "Right %s" % self._value
+        return f"Right {self._value}"
 
 
 class Left(Either[TSource, TError]):
@@ -129,7 +129,7 @@ def __eq__(self, other) -> bool:
         return isinstance(other, Left) and self._error == other._error
 
     def __str__(self) -> str:
-        return "Left: %s" % self._error
+        return f"Left: {self._error}"
 
 
 assert(isinstance(Either, Functor))

oslash/identity.py

@@ -52,7 +52,7 @@ def __eq__(self, other) -> bool:
         return self._value == other()
 
     def __str__(self) -> str:
-        return "Identity(%s)" % self._value
+        return f"Identity({self._value})"
 
     def __repr__(self) -> str:
         return str(self)

oslash/maybe.py

@@ -166,7 +166,7 @@ def __eq__(self, other) -> bool:
         return bool(other.map(lambda other_value: other_value == self._value))
 
     def __str__(self) -> str:
-        return "Just %s" % self._value
+        return f"Just {self._value}"
 
     def __repr__(self) -> str:
         return str(self)