替代Python之前的语法理解2.7 [英] Alternative to dict comprehension prior to Python 2.7

问题描述

如何使以下功能与Python 2.7之前的版本兼容？

How can I make the following functionality compatible with versions of Python earlier than Python 2.7?

gwfuncs = [reboot, flush_macs, flush_cache, new_gw, revert_gw, send_log]      
gw_func_dict = {chr(2**i): func for i, func in enumerate(gwfuncs[:8])}

推荐答案

使用：

gw_func_dict = dict((chr(2**i), func) for i, func in enumerate(gwfuncs[:8]))

这是 dict（）函数，一个生成器表达式生成（key，value）对。

That's the dict() function with a generator expression producing (key, value) pairs.

或者，一般来说，对形式的字母理解：

Or, to put it generically, a dict comprehension of the form:

{key_expr: value_expr for targets in iterable <additional loops or if expressions>}

始终可以与Python兼容2.7通过使用：

can always be made compatible with Python < 2.7 by using:

dict((key_expr, value_expr) for targets in iterable <additional loops or if expressions>)

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