[tune] API revamp fix (#10518)

python/ray/tune/utils/util.py

@@ -1,5 +1,6 @@
 import copy
 import logging
+import os
 import inspect
 import threading
 import time
@@ -152,6 +153,17 @@ class Tee(object):
         self.stream2.flush(*args, **kwargs)
 
 
+def env_integer(key, default):
+    # TODO(rliaw): move into ray.constants
+    if key in os.environ:
+        value = os.environ[key]
+        if value.isdigit():
+            return int(os.environ[key])
+        raise ValueError(f"Found {key} in environment, but value must "
+                         f"be an integer. Got: {value}.")
+    return default
+
+
 def merge_dicts(d1, d2):
     """
     Args: