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-rw-r--r--ranger/container/fsobject.py5
1 files changed, 3 insertions, 2 deletions
diff --git a/ranger/container/fsobject.py b/ranger/container/fsobject.py
index 10f8259d..fff29c36 100644
--- a/ranger/container/fsobject.py
+++ b/ranger/container/fsobject.py
@@ -31,6 +31,7 @@ else:
 _unsafe_chars = '\n' + ''.join(map(chr, range(32))) + ''.join(map(chr, range(128, 256)))
 _safe_string_table = maketrans(_unsafe_chars, '?' * len(_unsafe_chars))
 _extract_number_re = re.compile(r'(\d+|\D)')
+_integers = set("0123456789")
 
 def safe_path(path):
     return path.translate(_safe_string_table)
@@ -135,12 +136,12 @@ class FileSystemObject(FileManagerAware, SettingsAware):
 
     @lazy_property
     def basename_natural(self):
-        return [('0', int(s)) if s.isdigit() else (s, 0) \
+        return [('0', int(s)) if s in _integers else (s, 0) \
                 for s in _extract_number_re.split(self.relative_path)]
 
     @lazy_property
     def basename_natural_lower(self):
-        return [('0', int(s)) if s.isdigit() else (s, 0) \
+        return [('0', int(s)) if s in _integers else (s, 0) \
                 for s in _extract_number_re.split(self.relative_path_lower)]
 
     @lazy_property