add expiry days feature to pastebin magic

IPython/core/magics/code.py

@@ -249,7 +249,7 b' class CodeMagics(Magics):'
         """Upload code to dpaste.com, returning the URL.
 
         Usage:\\
-          %pastebin [-d "Custom description"] 1-7
+          %pastebin [-d "Custom description"][-e 24] 1-7
 
         The argument can be an input history range, a filename, or the name of a
         string or macro.
@@ -258,8 +258,10 b' class CodeMagics(Magics):'
 
           -d: Pass a custom description. The default will say
               "Pasted from IPython".
+          -e: Pass number of days for the link to be expired.
+              The default will be 7 days.
         """
-        opts, args = self.parse_options(parameter_s, 'd:')
+        opts, args = self.parse_options(parameter_s, 'd:e:')
 
         try:
             code = self.shell.find_user_code(args)
@@ -267,11 +269,23 b' class CodeMagics(Magics):'
             print(e.args[0])
             return
 
+        expiry_days = 7
+        if "e" in opts:
+            try:
+                expiry_days = int(opts.get("e", 7))
+            except ValueError as e:
+                print(e.args[0])
+                return
+            if expiry_days < 1 or expiry_days > 365:
+                print("Expiry days should be in range of 1 to 365.")
+                return
+
         post_data = urlencode(
             {
                 "title": opts.get("d", "Pasted from IPython"),
                 "syntax": "python",
                 "content": code,
+                "expiry_days": expiry_days
             }
         ).encode("utf-8")