Add first array draft

ci/environment.yml

@@ -9,6 +9,7 @@ dependencies:
   - pyarrow>=7
   - pandas>=2
   - pre-commit
+  - xarray
   - pip:
       - git+https://github.com/dask/distributed
       - git+https://github.com/dask/dask

dask_expr/_core.py

@@ -150,6 +150,9 @@ def pprint(self):
     def __hash__(self):
         return hash(self._name)
 
+    def __dask_tokenize__(self):
+        return self._name
+
     def __reduce__(self):
         if dask.config.get("dask-expr-no-serialize", False):
             raise RuntimeError(f"Serializing a {type(self)} object")

dask_expr/array/__init__.py

@@ -0,0 +1,14 @@
+from dask_expr.array import random
+from dask_expr.array.core import Array, from_array
+from dask_expr.array.reductions import (
+    mean,
+    moment,
+    nanmean,
+    nanstd,
+    nansum,
+    nanvar,
+    prod,
+    std,
+    sum,
+    var,
+)