python - 将 Python 循环方法转换为嵌套循环

Question

我是Python初学者。我想了解 Pythonic 的循环方法，因为我已经是一名 C 程序员很长时间了。鉴于以下两行:

{k: v for out_d in outs for k, v in out_d.iteritems()}
[{} for i in range(nthreads)]

有人可以将其分解，使其遵循嵌套循环的 C 标准方法吗？

Answer 1

my_dict = {k: v for out_d in outs for k, v in out_d.iteritems()}

# is equivalent to

my_dict = {}
for out_d in outs:
    for key, value in out_d.iteritems():
        my_dict[key] = value



my_list = [{} for i in range(nthreads)]

# is equivalent to

my_list = []
for i in range(nthreads):
    my_list.append({})