How to save a Python interactive session?
I find myself frequently using Python's interpreter to work with databases, files, etc -- basically a lot of manual formatting of semi-structured data. I don't properly save and clean up the useful bits as often as I would like. Is there a way to save my input into the shell (db connections, variable assignments, little for loops and bits of logic) -- some history of the interactive session? If I use something like script
I get too much stdout noise. I don't really need to pickle all the objects -- though if there is a solution that does that, it would be OK. Ideally I would just be left with a script that ran as the one I created interactively, and I could just delete the bits I didn't need. Is there a package that does this, or a DIY approach?
UPDATE: I am really amazed at the quality and usefulness of these packages. For those with a similar itch:
I am converted, these really fill a need between interpreter and editor.
IPython is extremely useful if you like using interactive sessions. For example for your use-case there is the %save
magic command, you just input %save my_useful_session 10-20 23
to save input lines 10 to 20 and 23 to my_useful_session.py
(to help with this, every line is prefixed by its number).
Furthermore, the documentation states:
This function uses the same syntax as %history for input ranges, then saves the lines to the filename you specify.
This allows for example, to reference older sessions, such as
%save current_session ~0/
%save previous_session ~1/
Look at the videos on the presentation page to get a quick overview of the features.
http://www.andrewhjon.es/save-interactive-python-session-history
import readline
readline.write_history_file('/home/ahj/history')
There is a way to do it. Store the file in ~/.pystartup
...
# Add auto-completion and a stored history file of commands to your Python
# interactive interpreter. Requires Python 2.0+, readline. Autocomplete is
# bound to the Esc key by default (you can change it - see readline docs).
#
# Store the file in ~/.pystartup, and set an environment variable to point
# to it: "export PYTHONSTARTUP=/home/user/.pystartup" in bash.
#
# Note that PYTHONSTARTUP does *not* expand "~", so you have to put in the
# full path to your home directory.
import atexit
import os
import readline
import rlcompleter
historyPath = os.path.expanduser("~/.pyhistory")
def save_history(historyPath=historyPath):
import readline
readline.write_history_file(historyPath)
if os.path.exists(historyPath):
readline.read_history_file(historyPath)
atexit.register(save_history)
del os, atexit, readline, rlcompleter, save_history, historyPath
and then set the environment variable PYTHONSTARTUP
in your shell (eg in ~/.bashrc
):
export PYTHONSTARTUP=$HOME/.pystartup
You can also add this to get autocomplete for free:
readline.parse_and_bind('tab: complete')
Please note that this will only work on *nix systems. As readline is only available in Unix platform.
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