检查对象列表是否包含具有特定属性值的对象


103

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()
Sven Marnach'2

Answers:


By using our site, you acknowledge that you have read and understand our Cookie Policy and Privacy Policy.
Licensed under cc by-sa 3.0 with attribution required.