From 2bb5d20fb2b4158390ab05aa6bf598b78f2caa9d Mon Sep 17 00:00:00 2001
From: keewis <keewis@users.noreply.github.com>
Date: Mon, 17 May 2021 14:56:39 +0200
Subject: [PATCH] improve the error message when pooch is not installed (#5312)

* improve the error message when pooch is not installed

* add pooch to "pip install xarray[io]" [skip-ci]

* don't mention of pypi and conda [skip-ci]
---
 setup.cfg          |  1 +
 xarray/tutorial.py | 14 ++++++++++----
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/setup.cfg b/setup.cfg
index aea5cd11ffd..b425d1f66e0 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -90,6 +90,7 @@ io =
     cftime
     rasterio
     cfgrib
+    pooch
     ## Scitools packages & dependencies (e.g: cartopy, cf-units) can be hard to install
     # scitools-iris
 
diff --git a/xarray/tutorial.py b/xarray/tutorial.py
index 62762d29216..f74155120ab 100644
--- a/xarray/tutorial.py
+++ b/xarray/tutorial.py
@@ -77,8 +77,11 @@ def open_dataset(
     """
     try:
         import pooch
-    except ImportError:
-        raise ImportError("using the tutorial data requires pooch")
+    except ImportError as e:
+        raise ImportError(
+            "tutorial.open_dataset depends on pooch to download and manage datasets."
+            " To proceed please install pooch."
+        ) from e
 
     logger = pooch.get_logger()
     logger.setLevel("WARNING")
@@ -146,8 +149,11 @@ def open_rasterio(
     """
     try:
         import pooch
-    except ImportError:
-        raise ImportError("using the tutorial data requires pooch")
+    except ImportError as e:
+        raise ImportError(
+            "tutorial.open_rasterio depends on pooch to download and manage datasets."
+            " To proceed please install pooch."
+        ) from e
 
     logger = pooch.get_logger()
     logger.setLevel("WARNING")