upstream/ipython Files · IPython/core/tests/simpleerr.py

Python vs IPython: recommend %cd, %env over !cd, !export...

Python vs IPython: recommend %cd, %env over !cd, !export The quick overview mentioned `!cd DIR` among examples of shell commands one might use —but that doesn't work as user would hope (can only affect commands in same ! e.g. `!cd /; pwd`). That's not as bad now that `!cd` prints a warning, but IMHO better to provide the right mental model up front. => Replaced that with minimal motivation why `!cd` and `!export` can't work, recommending some %magic alternatives; moved it out of examples to not distract, and right before Magics section.

Matthias Bussonnier - - Load All Authors

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             simpleerr.py
        
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      """Error script. DO NOT EDIT FURTHER! It will break exception doctests!!!"""

      import sys

      def div0():

          "foo"

          x = 1

          y = 0

          x/y

      def sysexit(stat, mode):

          raise SystemExit(stat, f"Mode = {mode}")

      def bar(mode):

          "bar"

          if mode=='div':

              div0()

          elif mode=='exit':

              try:

                  stat = int(sys.argv[2])

              except:

                  stat = 1

              sysexit(stat, mode)

          else:

              raise ValueError('Unknown mode')

      if __name__ == '__main__':

          try:

              mode = sys.argv[1]

          except IndexError:

              mode = 'div'

          bar(mode)

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				"""Error script. DO NOT EDIT FURTHER! It will break exception doctests!!!"""
				import sys

				def div0():
				"foo"
				x = 1
				y = 0
				x/y

				def sysexit(stat, mode):
				raise SystemExit(stat, f"Mode = {mode}")


				def bar(mode):
				"bar"
				if mode=='div':
				div0()
				elif mode=='exit':
				try:
				stat = int(sys.argv[2])
				except:
				stat = 1
				sysexit(stat, mode)
				else:
				raise ValueError('Unknown mode')

				if __name__ == '__main__':
				try:
				mode = sys.argv[1]
				except IndexError:
				mode = 'div'

				bar(mode)