Python 实用宝典

Question 1

When starting a django application using python manage.py shell, I get an InteractiveConsole shell – I can use tab completion, etc.

Python 2.5.1 (r251:54863, Apr 15 2008, 22:57:26) 
[GCC 4.0.1 (Apple Inc. build 5465)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)

When just starting a python interpreter using python, it doesn’t offer tab completion.

Can someone tell me what django is doing to give me an interactive console, or what I need to do to start an interactive console without a django app?

Question 2

I may have found a way to do it.

Create a file .pythonrc

# ~/.pythonrc
# enable syntax completion
try:
    import readline
except ImportError:
    print("Module readline not available.")
else:
    import rlcompleter
    readline.parse_and_bind("tab: complete")

then in your .bashrc file, add

export PYTHONSTARTUP=~/.pythonrc

That seems to work.

Question 3

I think django does something like https://docs.python.org/library/rlcompleter.html

If you want to have a really good interactive interpreter have a look at IPython.

Question 4

For the record, this is covered in the tutorial: http://docs.python.org/tutorial/interactive.html

Question 5

I use ptpython. https://github.com/jonathanslenders/ptpython/

ptpython is a wonderful tool autocomplete shell cmd. install ptpython is very easy,use pip tool

pip install ptpython

and for django shell,you should import the django env,like this

import os

os.environ.setdefault(“DJANGO_SETTINGS_MODULE”, “testweb.settings”)

Trust me,this is the best way to you!!!

Question 6

fix for windows10 shell:

pip install pyreadline
pip install ipython[shell]

Question 7

It looks like python3 has it out-of box!

Question 8

In Python3 this feature is enabled by default. My system didn’t have the module readline installed. I am on Manjaro. I didn’t face this tab completion issue on other linux distributions (elementary, ubuntu, mint).

After pip installing the module, while importing, it was throwing the following error-

ImportError: libncursesw.so.5: cannot open shared object file: No such file or directory

To solve this, I ran-

cd /usr/lib ln -s libncursesw.so libncursesw.so.5

This resolved the import error. And, it also brought the tab completion in the python repl without any creation/changes of .pythonrc and .bashrc.

Question 9

Yes. It’s built in to 3.6.

fernanr@gnuruwi ~ $ python3.6 Python 3.6.3 (default, Apr 10 2019, 14:37:36) [GCC 4.8.5 20150623 (Red Hat 4.8.5-16)] on linux Type “help”, “copyright”, “credits” or “license” for more information.

import os os. Display all 318 possibilities? (y or n) os.CLD_CONTINUED os.O_RDONLY os.ST_NOEXEC os.environ os.getpid( os.readlink( os.spawnvpe( os.CLD_DUMPED os.O_RDWR os.ST_NOSUID os.environb os.getppid( os.readv( os.st

Question 10

For older versions (2.x) above script works like charm :)

fernanr@crsatx4 ~ $ cat .bashrc | grep -i python
#Tab completion for python shell
export PYTHONSTARTUP=~/.pythonrc
fernanr@crsatx4 ~ $ . ~/.bashrc
fernanr@crsatx4 ~ $ echo $?
0
fernanr@crsatx4 ~ $ python2
Python 2.7.5 (default, Jun 11 2019, 14:33:56)
[GCC 4.8.5 20150623 (Red Hat 4.8.5-39)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> os.
Display all 249 possibilities? (y or n)
os.EX_CANTCREAT             os.O_WRONLY

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