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-rw-r--r--stwcs/wcsutil/altwcs.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/stwcs/wcsutil/altwcs.py b/stwcs/wcsutil/altwcs.py
index 043d535..1988d36 100644
--- a/stwcs/wcsutil/altwcs.py
+++ b/stwcs/wcsutil/altwcs.py
@@ -112,7 +112,7 @@ def archiveWCS(fname, ext, wcskey=" ", wcsname=" ", reusekey=False):
if ' ' in wnames:
wname = wnames[' ']
else:
- akeys = string.uppercase
+ akeys = string.ascii_uppercase
wname = "DEFAULT"
for key in akeys[-1::]:
if key in wnames: