Anonymous committed 31e456d Merge


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+import os
+class OverwriteError(EnvironmentError):
+    """Refusing to overwrite an existing file or directory.
+    Usage:
+    >> raise OverwriteError("OUTPUT")
+    OverwriteError: not overwriting file '/home/me/OUTPUT'
+    >> raise OverwriteError("/tmp", "output")
+    OverwriteError: not overwriting output directory '/tmp'
+    It will use the ``os`` module to get the full path and determine
+    whether the existing file is a directory.
+    """
+    def __init__(self, filename, what=""):
+        self.filename = filename
+        self.what = what
+        filetype = "file"
+        try:
+            if os.path.isdir(filename):
+                filetype = "directory"
+        except IOError:
+            pass
+        words = []
+        words.append("not overwriting")
+        if what:
+            words.append(what)
+        if filetype:
+            words.append(filetype)
+        words.append("'%s'" % os.path.abspath(filename))
+        msg = " ".join(words)
+        EnvironmentError.__init__(self, msg)
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