Merge pull request #446 from scikit-hep/issue-445

Fixes #445 by not reusing a variable.

tests/test_compression.py

@@ -2,13 +2,6 @@
 
 # BSD 3-Clause License; see https://github.com/scikit-hep/uproot/blob/master/LICENSE
 
-try:
-    import lzma
-except ImportError:
-    from backports import lzma
-import lz4
-import zstandard
-
 import uproot
 
 class Test(object):

uproot/source/compressed.py

@@ -66,7 +66,7 @@ def decompress(self, source, cursor, compressedbytes, uncompressedbytes=None):
                 try:
                     from backports.lzma import decompress as lzma_decompress
                 except ImportError:
-                    raise ImportError("Install lzma package with:\n    pip install backports.lzma\nor\n    conda install backports.lzma\n(or just use Python >= 3.3).")
+                    raise ImportError("install lzma package with:\n    pip install backports.lzma\nor\n    conda install backports.lzma\n(or just use Python >= 3.3).")
             return lzma_decompress(cursor.bytes(source, compressedbytes))
 
         elif self.algo == uproot.const.kOldCompressionAlgo:
@@ -76,7 +76,7 @@ def decompress(self, source, cursor, compressedbytes, uncompressedbytes=None):
             try:
                 from lz4.block import decompress as lz4_decompress
             except ImportError:
-                raise ImportError("Install lz4 package with:\n    pip install lz4\nor\n    conda install lz4")
+                raise ImportError("install lz4 package with:\n    pip install lz4\nor\n    conda install lz4")
 
             if uncompressedbytes is None:
                 raise ValueError("lz4 needs to know the uncompressed number of bytes")
@@ -86,7 +86,7 @@ def decompress(self, source, cursor, compressedbytes, uncompressedbytes=None):
             try:
                 import zstandard as zstd
             except ImportError:
-                raise ImportError("Install zstd package with:\n    pip install zstandard\nor\n    conda install zstandard")
+                raise ImportError("install zstd package with:\n    pip install zstandard\nor\n    conda install zstandard")
             dctx = zstd.ZstdDecompressor()
             return dctx.decompress(cursor.bytes(source, compressedbytes))
 
@@ -141,7 +141,7 @@ def _prepare(self):
                     try:
                         import xxhash
                     except ImportError:
-                        raise ImportError("Install xxhash package with:\n    pip install xxhash\nor\n    conda install python-xxhash")
+                        raise ImportError("install xxhash package with:\n    pip install xxhash\nor\n    conda install python-xxhash")
                     compression = self.compression.copy(uproot.const.kLZ4)
                     compressedbytes -= 8
                     checksum = cursor.field(self._compressed, self._format_field0)

uproot/tree.py

@@ -1972,20 +1972,21 @@ def lazyarrays(path, treepath, branches=None, namedecode="utf-8", entrysteps=flo
 
     lazyfiles = _LazyFiles(paths, treepath, branches, entrysteps, flatten, awkward.__name__, basketcache, keycache, executor, persistvirtual, localsource, xrootdsource, httpsource, options)
 
+    brancheslist = None
     for path in paths:
         file = uproot.rootio.open(path, localsource=localsource, xrootdsource=xrootdsource, httpsource=httpsource, **options)
         try:
             tree = file[treepath]
         except KeyError:
             continue
-        branches = list(tree._normalize_branches(branches, awkward))
+        brancheslist = list(tree._normalize_branches(branches, awkward))
         break
 
-    if branches is None:
+    if brancheslist is None:
         raise ValueError("no matching paths contained a tree named {0}".format(repr(treepath)))
 
     out = awkward.Table()
-    for branch, interpretation in branches:
+    for branch, interpretation in brancheslist:
         inner = interpretation
         while isinstance(inner, asjagged):
             inner = inner.content

uproot/version.py

@@ -6,7 +6,7 @@
 
 import re
 
-__version__ = "3.11.1"
+__version__ = "3.11.2"
 version = __version__
 version_info = tuple(re.split(r"[-\.]", __version__))