Add numpy to ext example

typon/trans/tests/pyext.post.py

 import pyext
 
-print("Imported:", pyext.add(5, 3), pyext.fibo(10))
+print("Imported:", pyext.add(5, 3), pyext.fibo(10), pyext.squares())
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typon/trans/tests/pyext.py

 # coding: utf-8
 # extension
 
-def add(x, y):
+import numpy as np
+
+def add(x, y) -> int:
     return x + y
 
 def fibo(n):
@@ -10,5 +12,8 @@ def fibo(n):
         res.append(res[i - 1] + res[i - 2])
     return res
 
+def squares() -> list[int]:
+    return np.square([x for x in range(5)])
+
 if __name__ == "__main__":
-    print("Python:", add(5, 3), fibo(10))
+    print("Python:", add(5, 3), fibo(10), squares())
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