upstream/ipython Files · IPython/deathrow/numeric_formats.py

Backport PR : Unicode content crashes the pager (console)...

Backport PR : Unicode content crashes the pager (console) We've run into an interesting bug in the astropy project. https://github.com/astropy/astropy/issues/600 When displaying a docstring that contains Unicode and is also long enough that it gets sent to the pager it fails since the docstring can't be sent to the pager as ascii. This crashes in the middle of sending content to the pager, so the shell ends up in an inconsistent state and stops echoing the keyboard etc. The fix (attached) is merely to encode the content sent to the pager in the same encoding as the terminal (`sys.stdout.encoding`). Strictly speaking, this isn't always the right thing to do, since the pager may be configured to expect a different encoding than the terminal, but that is sort of an irrational way to configure a machine... ;) For example, `less`, in the absence of any special environment variables to tell it otherwise, uses the standard `LC*` environment variables to determine what to do, which should be the same mechanism the terminal also uses by default. If anyone can suggest a better fix, I'm all for it. Perhaps it should be configurable, defaulting to `sys.stdout.encoding`?

Brian Granger - - Load All Authors

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      # -*- coding: utf-8 -*-

      """

      Extension for printing Numeric Arrays in flexible ways.

      """

      from Numeric import ArrayType

      def num_display(self,arg):

          """Display method for printing which treats Numeric arrays specially.

          """

          # Non-numpy variables are printed using the system default

          if type(arg) != ArrayType:

              self._display(arg)

              return

          # Otherwise, we do work.

          format = __IPYTHON__.runtime_rc.numarray_print_format

          print 'NumPy array, format:',format

          # Here is where all the printing logic needs to be implemented

          print arg # nothing yet :)

      def magic_format(self,parameter_s=''):

          """Specifies format of numerical output.

          This command is similar to Ocave's format command.

          """

          valid_formats = ['long','short']

          if parameter_s in valid_formats:

              self.runtime_rc.numarray_print_format = parameter_s

              print 'Numeric output format is now:',parameter_s

          else:

              print 'Invalid format:',parameter_s

              print 'Valid formats:',valid_formats

      # setup default format

      __IPYTHON__.runtime_rc.numarray_print_format = 'long'

      # Bind our new functions to the interpreter

      __IPYTHON__.__class__.magic_format = magic_format

      __IPYTHON__.hooks.display = num_display

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				# -- coding: utf-8 --
				"""
				Extension for printing Numeric Arrays in flexible ways.
				"""

				from Numeric import ArrayType

				def num_display(self,arg):
				"""Display method for printing which treats Numeric arrays specially.
				"""

				# Non-numpy variables are printed using the system default
				if type(arg) != ArrayType:
				self._display(arg)
				return
				# Otherwise, we do work.
				format = __IPYTHON__.runtime_rc.numarray_print_format
				print 'NumPy array, format:',format
				# Here is where all the printing logic needs to be implemented
				print arg # nothing yet :)


				def magic_format(self,parameter_s=''):
				"""Specifies format of numerical output.

				This command is similar to Ocave's format command.
				"""

				valid_formats = ['long','short']

				if parameter_s in valid_formats:
				self.runtime_rc.numarray_print_format = parameter_s
				print 'Numeric output format is now:',parameter_s
				else:
				print 'Invalid format:',parameter_s
				print 'Valid formats:',valid_formats

				# setup default format
				__IPYTHON__.runtime_rc.numarray_print_format = 'long'

				# Bind our new functions to the interpreter
				__IPYTHON__.__class__.magic_format = magic_format
				__IPYTHON__.hooks.display = num_display