Python：功能map（）列表指定字段值的列表

Question

您好了下面的java 8代码，我如何在python 2.7中执行以下操作

Array(6);     // Creates an array containing six empty slots
Array(null);  // Creates an array containing one null
Array(6,6,6); // Creates an array containing three 6
[6];          // Creates an array containing one 6
[null];       // Creates an array containing one null
[6,6,6];      // Creates an array containing three 6

请记住，因为我在python中迭代字典，所以modulename作为模块['modulename']

进行访问

Answer 1

据我所知，这是Python中的简单list comprehension：

[module['modulename'] for module in modules]

或者，map()和itemgetter()：

In [1]: modules = [{'module': 'module1'}, {'module': 'module2'}]

In [2]: from operator import itemgetter

In [3]: map(itemgetter('module'), modules)  # on Python3, you would need to call list() on it to see the same result
Out[3]: ['module1', 'module2']