设置python 命令行交互程序自己主动补齐

1. 1. 新建Python环境变量配置文件：

   vim ~/.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=~/.pystartup" in bash.
   import atexit
   import os
   import readline
   import rlcompleter
   readline.parse_and_bind('tab: complete')
   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

2. 2.设置Python环境变量：

3. 即时生效，重新启动失效：export PYTHONSTARTUP=~/.pystartup  

4. 永久对当前用户生效：echo "export PYTHONSTARTUP=~/.pystartup" >> ~/.bash_profile