Undelete hello_world.py (flyteorg#287)

Signed-off-by: Ketan Umare <[email protected]>

cookbook/core/flyte_basics/hello_world.py

@@ -0,0 +1,39 @@
+"""
+Hello World Workflow
+--------------------
+This simple workflow calls a task that returns "Hello World" and then just sets that as the final output of the workflow.
+"""
+import typing
+
+from flytekit import task, workflow
+
+
+# You can change the signature of the workflow to take in an argument like this:
+# def say_hello(name: str) -> str:
+@task
+def say_hello() -> str:
+    return "hello world"
+
+
+# %%
+# You can treat the outputs of a task as you normally would a Python function. Assign the output to two variables
+# and use them in subsequent tasks as normal. See :py:func:`flytekit.workflow`
+# You can change the signature of the workflow to take in an argument like this:
+# def my_wf(name: str) -> str:
+@workflow
+def my_wf() -> str:
+    res = say_hello()
+    return res
+
+
+# %%
+# Execute the Workflow, simply by invoking it like a function and passing in
+# the necessary parameters
+#
+# .. note::
+#
+#   One thing to remember, currently we only support ``Keyword arguments``. So
+#   every argument should be passed in the form ``arg=value``. Failure to do so
+#   will result in an error
+if __name__ == "__main__":
+    print(f"Running my_wf() {my_wf()}")