upstream/ipython Files · IPython/utils/nested_context.py

Add -q option (suppress print upon creation) to %macro...

Add -q option (suppress print upon creation) to %macro Macros are very, very useful and "Matlab" like (as well as other similar math computing environs). Often I (or my students) use a macro to load long complex code from a url -- e.g., large data sets, simulated data, preprocessing of data, special plotting commands, grading routines... Currently, this requires defining the macro at the end of the notebook so when the "print upon creation" occurs it doesn't overwhelm the notebook (except at the end). The -q option suppresses the print contents upon creation. Example with a Matplotlib example: In[1]: %macro tmp http://matplotlib.org/mpl_examples/api/date_demo.py Macro `tmp` created. To execute, type its name (without quotes). === Macro contents: === """ Show how to make date plots in matplotlib using date tick locators and formatters. See major_minor_demo1.py for more information on controlling major and minor ticks ... In[2]: %macro -q tmp2 http://matplotlib.org/mpl_examples/api/date_demo.py (nothing) Perhaps, though, the first line should print -- e.g., Macro `tmp` created. To execute, type its name (without quotes). In the docstraing, I also fixed a typo (an "as" that should be an "at") and clarified how to produce an example output.

Thomas Kluyver - - Load All Authors

File last commit:

r9244:666fdfa8


                r10962:f96aac3a

Download file

             nested_context.py
        
                    50 lines
            
             | 1.5 KiB
            
                | text/x-python
            
             |
                PythonLexer
            
             / IPython / utils / nested_context.py
          
                    History
                
                 |
                  Annotation
                 | Raw
                 |Copy content
                 |Copy permalink

      """Backwards compatibility - we use contextlib.nested to support Python 2.6,

      but it's removed in Python 3.2."""

      # TODO : Remove this once we drop support for Python 2.6, and use

      # "with a, b:" instead.

      import sys

      from contextlib import contextmanager

      @contextmanager

      def nested(*managers):

          """Combine multiple context managers into a single nested context manager.

         This function has been deprecated in favour of the multiple manager form

         of the with statement.

         The one advantage of this function over the multiple manager form of the

         with statement is that argument unpacking allows it to be

         used with a variable number of context managers as follows::

            with nested(*managers):

                do_something()

          """

          exits = []

          vars = []

          exc = (None, None, None)

          try:

              for mgr in managers:

                  exit = mgr.__exit__

                  enter = mgr.__enter__

                  vars.append(enter())

                  exits.append(exit)

              yield vars

          except:

              exc = sys.exc_info()

          finally:

              while exits:

                  exit = exits.pop()

                  try:

                      if exit(*exc):

                          exc = (None, None, None)

                  except:

                      exc = sys.exc_info()

              if exc != (None, None, None):

                  # Don't rely on sys.exc_info() still containing

                  # the right information. Another exception may

                  # have been raised and caught by an exit method

                  raise exc[0], exc[1], exc[2]

	Site-wide shortcuts
/	Use quick search box
g h	Goto home page
g g	Goto my private gists page
g G	Goto my public gists page
g 0-9	Goto bookmarked items from 0-9
n r	New repository page
n g	New gist page

	Repositories
g s	Goto summary page
g c	Goto changelog page
g f	Goto files page
g F	Goto files page with file search activated
g p	Goto pull requests page
g o	Goto repository settings
g O	Goto repository access permissions settings
t s	Toggle sidebar on some pages

				"""Backwards compatibility - we use contextlib.nested to support Python 2.6,
				but it's removed in Python 3.2."""

				# TODO : Remove this once we drop support for Python 2.6, and use
				# "with a, b:" instead.

				import sys

				from contextlib import contextmanager

				@contextmanager
				def nested(*managers):
				"""Combine multiple context managers into a single nested context manager.

				This function has been deprecated in favour of the multiple manager form
				of the with statement.

				The one advantage of this function over the multiple manager form of the
				with statement is that argument unpacking allows it to be
				used with a variable number of context managers as follows::

				with nested(*managers):
				do_something()

				"""
				exits = []
				vars = []
				exc = (None, None, None)
				try:
				for mgr in managers:
				exit = mgr.__exit__
				enter = mgr.__enter__
				vars.append(enter())
				exits.append(exit)
				yield vars
				except:
				exc = sys.exc_info()
				finally:
				while exits:
				exit = exits.pop()
				try:
				if exit(*exc):
				exc = (None, None, None)
				except:
				exc = sys.exc_info()
				if exc != (None, None, None):
				# Don't rely on sys.exc_info() still containing
				# the right information. Another exception may
				# have been raised and caught by an exit method
				raise exc[0], exc[1], exc[2]