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diff -up hplip-3.18.5/base/utils.py.use-binary-str hplip-3.18.5/base/utils.py
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--- hplip-3.18.5/base/utils.py.use-binary-str	2018-05-28 13:52:32.698082273 +0200
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+++ hplip-3.18.5/base/utils.py	2018-05-28 13:53:20.563707314 +0200
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@@ -961,10 +961,7 @@ else:
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 def printable(s):
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-    if s:
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-        return s.translate(identity, unprintable)
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-    else:
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-        return ""
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+    return s.translate(identity, unprintable)
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 def any(S,f=lambda x:x):
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diff -up hplip-3.18.5/fax/pmlfax.py.use-binary-str hplip-3.18.5/fax/pmlfax.py
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--- hplip-3.18.5/fax/pmlfax.py.use-binary-str	2018-05-24 06:34:40.000000000 +0200
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+++ hplip-3.18.5/fax/pmlfax.py	2018-05-28 13:52:05.752293151 +0200
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@@ -143,8 +143,8 @@ class PMLFaxDevice(FaxDevice):
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     def getPhoneNum(self):
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         if PY3:
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-            data = utils.printable(self.getPML(pml.OID_FAX_LOCAL_PHONE_NUM)[1])
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-            return data
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+            data = utils.printable(self.getPML(pml.OID_FAX_LOCAL_PHONE_NUM)[1].encode('utf-8'))
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+            return data.decode('utf-8')
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         else:
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             return utils.printable(self.getPML(pml.OID_FAX_LOCAL_PHONE_NUM)[1])
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     phone_num = property(getPhoneNum, setPhoneNum, doc="OID_FAX_LOCAL_PHONE_NUM")
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@@ -155,8 +155,8 @@ class PMLFaxDevice(FaxDevice):
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     def getStationName(self):
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         if PY3:
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-            data = utils.printable(self.getPML(pml.OID_FAX_STATION_NAME)[1])
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-            return data
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+            data = utils.printable(self.getPML(pml.OID_FAX_STATION_NAME)[1].encode('utf-8'))
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+            return data.decode('utf-8')
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         else:
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             return utils.printable(self.getPML(pml.OID_FAX_STATION_NAME)[1])
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