Add numpy example

[robertodr]

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[MinazoBot]

	1 Error
🚫	Code style violations detected.

Code Style Check

---

Code style violations detected in the following files:

• hello_world.py

Execute one of the following actions and commit again:

1. Run yapf on the offending files
2. Apply the suggested patches with git apply patch.

hello_world.py

--- hello_world.py
+++ hello_world.py
@@ -1,9 +1,9 @@
 def vector(dim):
     import numpy as np
 
-
     return np.random.rand(dim)
 
+
 def message():
     return 'Hello, Danger world!'
 
@@ -11,5 +11,6 @@
     print(message())
     print(vector(10))
 
+
 if __name__ == '__main__':
     main()

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