我想检查对象列表是否包含具有特定属性值的对象。
class Test:
def __init__(self, name):
self.name = name
# in main()
l = []
l.append(Test("t1"))
l.append(Test("t2"))
l.append(Test("t2"))
我想要一种检查列表是否包含名称的对象的方法"t1"
。如何做呢?我发现https://stackoverflow.com/a/598415/292291,
[x for x in myList if x.n == 30] # list of all matches
any(x.n == 30 for x in myList) # if there is any matches
[i for i,x in enumerate(myList) if x.n == 30] # indices of all matches
def first(iterable, default=None):
for item in iterable:
return item
return default
first(x for x in myList if x.n == 30) # the first match, if any
我不想每次都遍历整个列表,我只需要知道是否有1个匹配的实例即可。会first(...)
还是any(...)
会这样做?
first()
函数作为内置的可用next()
。