updated anndata requirement

scanpy/__init__.py

@@ -9,6 +9,11 @@
 import warnings
 from distutils.version import LooseVersion
 
+# version generated by versioneer
+from ._version import get_versions
+__version__ = get_versions()['version']
+del get_versions
+
 if sys.version_info < (3, 0):
     warnings.warn('Scanpy only runs reliably with Python 3, preferrably >=3.5.')
 
@@ -19,12 +24,7 @@
                       .format(pd.__version__))
 
 import anndata
-if anndata.__version__ < LooseVersion('0.3.4'):
-    raise ImportError('Scanpy needs anndata version >=0.3.4, not {}.\n'
+if anndata.__version__ < LooseVersion('0.4'):
+    raise ImportError('Scanpy {} needs anndata version >=0.4, not {}.\n'
                       'Run `pip install anndata --upgrade`.'
-                      .format(anndata.__version__))
-
-# version generated by versioneer
-from ._version import get_versions
-__version__ = get_versions()['version']
-del get_versions
+                      .format(__version__, anndata.__version__))