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

Backport PR : Infinite loop when multiple debuggers have been attached....

Backport PR : Infinite loop when multiple debuggers have been attached. Replaces pull-request . Fixed infinite loop on exit in the event of where multiple debuggers have been attached an there is an uncaught exception. Test code: ```python from IPython.core.debugger import Tracer; Tracer() Tracer() raise Exception ``` Pinging @DamianHeard to review.

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             pyfile.py
        
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      """Utilities for working with Python source files.

      Exposes various functions from recent Python standard libraries, along with

      equivalents for older Python versions.

      """

      import os.path

      try:    # Python 3.2

          from imp import source_from_cache, cache_from_source

      except ImportError:

          # Python <= 3.1: .pyc files go next to .py

          def source_from_cache(path):

              basename, ext = os.path.splitext(path)

              if ext not in ('.pyc', '.pyo'):

                  raise ValueError('Not a cached Python file extension', ext)

              # Should we look for .pyw files?

              return basename + '.py'

          def cache_from_source(path, debug_override=None):

              if debug_override is None:

                  debug_override = __debug__

              basename, ext = os.path.splitext(path)

              return basename + '.pyc' if debug_override else '.pyo'

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				"""Utilities for working with Python source files.

				Exposes various functions from recent Python standard libraries, along with
				equivalents for older Python versions.
				"""
				import os.path

				try: # Python 3.2
				from imp import source_from_cache, cache_from_source
				except ImportError:
				# Python <= 3.1: .pyc files go next to .py
				def source_from_cache(path):
				basename, ext = os.path.splitext(path)
				if ext not in ('.pyc', '.pyo'):
				raise ValueError('Not a cached Python file extension', ext)
				# Should we look for .pyw files?
				return basename + '.py'

				def cache_from_source(path, debug_override=None):
				if debug_override is None:
				debug_override = __debug__
				basename, ext = os.path.splitext(path)
				return basename + '.pyc' if debug_override else '.pyo'