Do not poll on init

Author: Serge Rey

libpysal/examples/__init__.py

@@ -4,17 +4,30 @@
 
 from .base import example_manager
 from .remotes import datasets as remote_datasets
-from .remotes import download as fetch_all
 from .builtin import datasets as builtin_datasets
 
 
 from typing import Union
 
 __all__ = ["get_path", "available", "explain", "fetch_all"]
 
-example_manager.add_examples(remote_datasets)
 example_manager.add_examples(builtin_datasets)
 
+def fetch_all():
+    """Fetch and install all remote datasets
+    """
+    datasets = remote_datasets.datasets
+    names = list(datasets.keys())
+    names.sort()
+    for name in names:
+        print(name)
+        example = datasets[name]
+        try:
+            example.download()
+        except:
+            print("Example not downloaded: {}".format(name))
+    example_manager.add_examples(datasets)
+
 
 def available() -> str:
     """List available datasets."""

libpysal/examples/remotes.py

@@ -95,20 +95,17 @@ def poll_remotes():
     return datasets
 
 
-datasets = poll_remotes()
+#datasets = poll_remotes()
 
+class Remotes:
+    def __init__(self):
+        self._datasets = None
 
-def download(datasets=datasets):
-    """
-    Download all known remotes
-    """
+    @property
+    def datasets(self):
+        if self._datasets is None:
+            self._datasets = poll_remotes()
+        return self._datasets
+
+datasets = Remotes()
 
-    names = list(datasets.keys())
-    names.sort()
-    for name in names:
-        print(name)
-        example = datasets[name]
-        try:
-            example.download()
-        except:
-            print("Example not downloaded: {}".format(name))