fix: Add numpy as a required dependency for py client (#6308)

and clean up setup.py a bit

Fixes #6304

py/client/setup.py

@@ -11,11 +11,13 @@
 from pkg_resources import parse_version
 from setuptools import find_packages, setup
 
+
 def _get_readme() -> str:
     # The directory containing this file
-    HERE = pathlib.Path(__file__).parent
+    here = pathlib.Path(__file__).parent
     # The text of the README file
-    return (HERE / "README.md").read_text(encoding="utf-8")
+    return (here / "README.md").read_text(encoding="utf-8")
+
 
 def _normalize_version(java_version):
     partitions = java_version.partition("-")
@@ -24,9 +26,11 @@ def _normalize_version(java_version):
     python_version = f"{regular_version}+{local_segment}" if local_segment else regular_version
     return str(parse_version(python_version))
 
+
 def _compute_version():
     return _normalize_version(os.environ['DEEPHAVEN_VERSION'])
 
+
 setup(
     name='pydeephaven',
     version=_compute_version(),
@@ -54,6 +58,7 @@ def _compute_version():
     install_requires=['pyarrow',
                       'bitstring',
                       'grpcio',
-                      'protobuf'],
+                      'protobuf',
+                      'numpy'],
     package_data={'pydeephaven': ['py.typed']}
 )