Source: bpython
Severity: normal
Dear Maintainer,
running bpython(3) inside a minimal installation and trying to read the
help of some module or function results in an ``OSError: [Errno 2] No
such file or directory`` | ``FileNotFoundError: [Errno 2] No such file
or directory: 'less'`` (python 2 or 3 respectively) because the pager of
choice (which seems to be less) can't be found.
Manually installing less results in the correct behaviour.
I agree that running bpython(3) on a system where less is not installed
is a niche case (it took me years of using bpython before I ever met
this issue), but I think that less should be added to the Recommends: of
both bpython and bpython3, as I consider reading help quite a common
activity inside an interactive interpreter. (not a Depends:, as it isn't
required for basic functionality, however).
To reproduce:
* debootstrap a chroot, forget to install basic tools such as less :)
* install bpython or bpython3 inside the chroot and run it::
>>> import this
[...]
>>> help(this)
Traceback (most recent call last):
File "<input>", line 1, in <module>
help(this)
File
"/usr/lib/python3/dist-packages/bpython/curtsiesfrontend/_internal.py", l
ine 60, in __call__
return super(_Helper, self).__call__(*args, **kwargs)
File "/usr/lib/python3/dist-packages/bpython/_internal.py", line 24, in
__call
__
self.helper(*args, **kwargs)
File "/usr/lib/python3.5/pydoc.py", line 1853, in __call__
self.help(request)
File "/usr/lib/python3.5/pydoc.py", line 1906, in help
else: doc(request, 'Help on %s:', output=self._output)
File "/usr/lib/python3.5/pydoc.py", line 1640, in doc
pager(render_doc(thing, title, forceload))
File
"/usr/lib/python3/dist-packages/bpython/curtsiesfrontend/_internal.py", l
ine 53, in pager
self._repl.pager(output)
File "/usr/lib/python3/dist-packages/bpython/curtsiesfrontend/repl.py",
line 1
699, in pager
self.focus_on_subprocess(command + [tmp.name])
File "/usr/lib/python3/dist-packages/bpython/curtsiesfrontend/repl.py",
line 1
684, in focus_on_subprocess
stdout=sys.__stdout__)
File "/usr/lib/python3.5/subprocess.py", line 676, in __init__
restore_signals, start_new_session)
File "/usr/lib/python3.5/subprocess.py", line 1282, in _execute_child
raise child_exception_type(errno_num, err_msg)
FileNotFoundError: [Errno 2] No such file or directory: 'less'
Thanks for your job maintaining bpython
