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diff --git a/Omni/Bild/Example.py b/Omni/Bild/Example.py
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+++ b/Omni/Bild/Example.py
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+"""
+Test that bild can build Python stuff.
+
+Example Python file that also serves as a test case for bild.
+"""
+
+# : out example
+# : dep cryptography
+import cryptography.fernet
+import sys
+
+
+def cryptic_hello(name: str) -> str:
+    """
+    Encrypt and decrypt `name`.
+
+    Example taken from `cryptography` docs.
+
+    Raises:
+        ValueError: if decryption fails
+    """
+    key = cryptography.fernet.Fernet.generate_key()
+    f = cryptography.fernet.Fernet(key)
+    token = f.encrypt(hello(name).encode("utf-8"))
+    ret = f.decrypt(token).decode("utf-8")
+    if ret != hello(name):
+        msg = "en/decryption failed!"
+        raise ValueError(msg)
+    return ret
+
+
+def hello(name: str) -> str:
+    """Say hello."""
+    return f"Hello {name}"
+
+
+def main() -> None:
+    """Entrypoint."""
+    if "test" in sys.argv:
+        sys.stdout.write("testing success")
+    sys.stdout.write(cryptic_hello("world"))
+
+
+if __name__ == "__main__":
+    main()