替代 Python 2.7 之前的 dict 理解 [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 Python 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]))

这是带有生成器表达式的 dict() 函数，生成 (key, value) 对.

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

或者，笼统地说，形式的字典理解:

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

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

总是可以与 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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