13. 现在怎么办?
某些版本的 Python 解释器支持编辑当前输入行和历史代入，类似在 Korn Shell 和 GNU Bash Shell 中找到的设施。此实现使用 GNU Readline 库，支持各种样式的编辑。此库拥有自己的文档编制 (在此不再赘述)。
变量和模块名称的补全是 automatically enabled at interpreter startup so that the Tab key invokes the completion function; it looks at Python statement names, the current local variables, and the available module names. For dotted expressions such as string.a , it will evaluate the expression up to the final '.' and then suggest completions from the attributes of the resulting object. Note that this may execute application-defined code if an object with a __getattr__() method is part of the expression. The default configuration also saves your history into a file named .python_history in your user directory. The history will be available again during the next interactive interpreter session.
string.a
'.'
__getattr__()
.python_history
This facility is an enormous step forward compared to earlier versions of the interpreter; however, some wishes are left: It would be nice if the proper indentation were suggested on continuation lines (the parser knows if an indent token is required next). The completion mechanism might use the interpreter’s symbol table. A command to check (or even suggest) matching parentheses, quotes, etc., would also be useful.
One alternative enhanced interactive interpreter that has been around for quite some time is IPython , which features tab completion, object exploration and advanced history management. It can also be thoroughly customized and embedded into other applications. Another similar enhanced interactive environment is bpython .
15. 浮点算术：问题和局限性
键入搜索术语或模块、类、函数名称。