16.9. rlcompleter — GNU readline的完成函数

源代码: Lib/rlcompleter.py


rlcompeleter 通过补全有效的 Python 标识符和关键字为 readline 模块定义了一个补全功能套装.

当此模块在具有可用的 readline 模块的 Unix 平台被导入, 一个 Completer 实例将被自动创建并且它的 complete() 方法将设置为 readline 的补全器.

示例:

>>> import rlcompleter
>>> import readline
>>> readline.parse_and_bind("tab: complete")
>>> readline. <TAB PRESSED>
readline.__doc__          readline.get_line_buffer(  readline.read_init_file(
readline.__file__         readline.insert_text(      readline.set_completer(
readline.__name__         readline.parse_and_bind(
>>> readline.

The rlcompleter module is designed for use with Python’s interactive mode. A user can add the following lines to his or her initialization file (identified by the PYTHONSTARTUP environment variable) to get automatic Tab completion:

try:
    import readline
except ImportError:
    print "Module readline not available."
else:
    import rlcompleter
    readline.parse_and_bind("tab: complete")

在没有 readline 的平台, 此模块定义的 Completer 类仍然可以用于自定义行为.

16.9.1. Completer对象

Completer对象具有以下方法:

Completer.complete(text, state)

text 返回 stateth 补全.

If called for text that doesn’t include a period character ('.'), it will complete from names currently defined in __main__, __builtin__ and keywords (as defined by the keyword module).

如果为加点的名称执行调用,它将尝试尽量求值直到最后一部分为止而不产生附带影响(函数不会被求值,但它可以生成对 __getattr__() 的调用),并通过 dir() 函数来匹配剩余部分。 在对表达式求值期间引发的任何异常都会被捕获、静默处理并返回 None