如何在没有for循环的情况下访问列表中类的属性

Question

如何在没有for循环的情况下访问列表中类的属性？我一直在创建列表，循环使用它们效率很低，所以我尽量避免使用干净的代码。你知道吗

杀了你_循环.py你知道吗

# Define our arbitrary class
class IntRelationships(object):
    def __init__(self, a, b):
        self.a = a
        self.b = b
        self.diff = abs(b-a)
    def add(self):
        return self.a + self.b

# create a class list
relationship_list = [ IntRelationships(1,2), IntRelationships(2,4), IntRelationships(4, 8)]

# How I currently access attributes in list
large_diff_list = []
for relationship in relationship_list:
    if relationship.diff > 1:
        large_diff_list.append(relationship)

# How imagine one could do it without a loop and array initialisation
large_diff_list2 = relationship_list[ relationship_list[:].diff > 1 ]

Answer 1

您可以使用list comprehension：

large_diff_list = [r for r in relationship_list if r.diff > 1]