许多时候，我们使用Python，并不用写一个程序，一些不复杂的任务，我更喜欢在 IDLE（也就是交互式提示模式）下输入几行代码完成。然而，在这个模式下编辑代码，也有不够便利的地方，最主要的就是，不能用Tab自动补全，不能记忆 上一次输入的命令（没办法，谁让我们在Shell下习惯了呢）。
这时候，我们可以直接使用Python启动脚本，解决这个问题。
启动脚本的程序非常简单，这里不多说明，只给出代码：
import readline import rlcompleter import atexit import os # tab autocomplete readline.parse_and_bind(‘tab: complete’) # history file histfile = os.path.join(os.environ['HOME'], ‘.pythonhistory’) try: readline.read_history_file(histfile) except IOError: pass atexit.register(readline.write_history_file, histfile) del os, histfile, readline, rlcompleter
完成之后，我们把它保存为.pythonstartup，存放在自己的目录下（譬如/home/yurii），再将PYTHONSTARTUP变量指向刚才放的地址，就可以了。最省事的办法是在bashrc中添加这样一行：
export PYTHONSTARTUP=/home/yurii/.pythonstartup
这样，不但增加了tab的自动补全功能，而且重新启动IDLE时，通过上下键，还能翻到上次输入的命令，非常方便。
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