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Fix issue #880 - more useful message to user when %paste fails #999

merged 2 commits into from over 2 years ago

2 participants

Matt Cottingham Thomas Kluyver
Matt Cottingham

When tkinter is not installed and '%paste' is run, the user is now prompted to install it.

Initializes TryNext exception in CommandChainDispatcher with args/kwargs to present a message to the user with the traceback.

Matt Cottingham Fix issue #880 - initialize TryNext with args and kwargs.
Presents a message to the user along with the traceback prompting them to install tkinter.
Thomas Kluyver

Thanks, Matt. I think it would be good to also catch this exception in magic_paste (see here), and just print an error message instead of showing an unhelpful traceback.

Matt Cottingham

Sounds good - and I'll also clean up the message. Still getting to grips with the codebase somewhat.

Thomas Kluyver

No worries - part of the idea behind quickfix bugs is to get new people into the code.

Thomas Kluyver

@MattCottingham: Have you had a chance to have another look at this? Don't worry if not.

Matt Cottingham

@takluyver, afraid I haven't had a chance this week - but I will have more time this coming week. Though if somebody else would like to fix it don't let this block them :)

Thomas Kluyver
Matt Cottingham

@takluyver, I've made a quick update to catch the exception in magic_paste. If an error message is provided, that is printed. Otherwise, if no other details are provided, a more generic message is printed.

In some ways I'd like to re-raise in magic_paste and handle the exception in the caller, but I realise that's not quite how TryNext is used across the project.

Any suggestions for improvement welcome!

Thomas Kluyver takluyver merged commit 205731a into from November 21, 2011
Thomas Kluyver takluyver closed this November 21, 2011
Thomas Kluyver

That's great. Don't worry, we don't generally raise exceptions from magic_* functions.

I've made one tiny change, so the error is a little bit tidier (213b5ed), and merged it.

Damián Avila damianavila referenced this pull request from a commit July 30, 2013
Commit has since been removed from the repository and is no longer available.
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Showing 2 unique commits by 1 author.

Nov 14, 2011
Matt Cottingham Fix issue #880 - initialize TryNext with args and kwargs.
Presents a message to the user along with the traceback prompting them to install tkinter.
Nov 21, 2011
Matt Cottingham Catch clipboard exception in magic_paste and print error message 205731a
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2  IPython/core/
@@ -138,7 +138,7 @@ def __call__(self,*args, **kw):
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                     args = exc.args
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                     kw = exc.kwargs
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         # if no function will accept it, raise TryNext up to the caller
-        raise TryNext
+        raise TryNext(*args, **kw)
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     def __str__(self):
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         return str(self.chain)
15  IPython/frontend/terminal/
@@ -34,7 +34,7 @@
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 from IPython.utils import py3compat
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 from IPython.utils.terminal import toggle_set_term_title, set_term_title
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 from IPython.utils.process import abbrev_cwd
-from IPython.utils.warn import warn
+from IPython.utils.warn import warn, error
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 from IPython.utils.text import num_ini_spaces
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 from IPython.utils.traitlets import Int, CBool, Unicode
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@@ -611,9 +611,16 @@ def magic_paste(self, parameter_s=''):
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         if opts.has_key('r'):
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-        text =
-        block = self._strip_pasted_lines_for_code(text.splitlines())
+        try:
+            text =
+            block = self._strip_pasted_lines_for_code(text.splitlines())
+        except TryNext as clipboard_exc:
+            message = getattr(clipboard_exc, 'args')
+            if message:
+                error(message)
+            else:
+                error('Could not get text from the clipboard.')
+            return
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         # By default, echo back to terminal unless quiet mode is requested
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         if not opts.has_key('q'):

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