[3.11] gh-102541: Hide traceback in help prompt (gh-102614). (gh-105830)

(cherry picked from commit ba516e7) Co-authored-by: Kirill Podoprigora <kirill.bast9@mail.ru>

Author: corona10

Lib/pydoc.py

@@ -1778,10 +1778,15 @@ def render_doc(thing, title='Python Library Documentation: %s', forceload=0,
  return title % desc + '\n\n' + renderer.document(object, name)
 
 def doc(thing, title='Python Library Documentation: %s', forceload=0,
- output=None):
+ output=None, is_cli=False):
  """Display text documentation, given an object or a path to an object."""
  if output is None:
- pager(render_doc(thing, title, forceload))
+ try:
+ pager(render_doc(thing, title, forceload))
+ except ImportError as exc:
+ if is_cli:
+ raise
+ print(exc)
  else:
  output.write(render_doc(thing, title, forceload, plaintext))
 
@@ -2042,8 +2047,8 @@ def getline(self, prompt):
  self.output.flush()
  return self.input.readline()
 
- def help(self, request):
- if type(request) is type(''):
+ def help(self, request, is_cli=False):
+ if isinstance(request, str):
  request = request.strip()
  if request == 'keywords': self.listkeywords()
  elif request == 'symbols': self.listsymbols()
@@ -2054,13 +2059,13 @@ def help(self, request):
  elif request in self.symbols: self.showsymbol(request)
  elif request in ['True', 'False', 'None']:
  # special case these keywords since they are objects too
- doc(eval(request), 'Help on %s:')
+ doc(eval(request), 'Help on %s:', is_cli=is_cli)
  elif request in self.keywords: self.showtopic(request)
  elif request in self.topics: self.showtopic(request)
- elif request: doc(request, 'Help on %s:', output=self._output)
- else: doc(str, 'Help on %s:', output=self._output)
+ elif request: doc(request, 'Help on %s:', output=self._output, is_cli=is_cli)
+ else: doc(str, 'Help on %s:', output=self._output, is_cli=is_cli)
  elif isinstance(request, Helper): self()
- else: doc(request, 'Help on %s:', output=self._output)
+ else: doc(request, 'Help on %s:', output=self._output, is_cli=is_cli)
  self.output.write('\n')
 
  def intro(self):
@@ -2798,7 +2803,7 @@ class BadUsage(Exception): pass
  else:
  writedoc(arg)
  else:
- help.help(arg)
+ help.help(arg, is_cli=True)
  except (ImportError, ErrorDuringImport) as value:
  print(value)
  sys.exit(1)

Misc/NEWS.d/next/Library/2023-03-12-01-17-15.gh-issue-102541.LK1adc.rst

@@ -0,0 +1 @@
+Hide traceback in :func:`help` prompt, when import failed.