如果你尝试修改这些对象的值,Python 解释器会抛出一个 TypeError,提示你“cannot assign to immutable value”。 示例 假设你有一个字符串,并尝试修改它的某个字符: python s = "hello" s[1] = 'a' # 这将引发 TypeError 上面的代码会抛出错误,因为字符串是不可变的。 解决方法 使用可变类型:如果你需要...
这只是将混合留到以后进行。但这只是打印字符串,而不关注 Iterable mixin。让我们明确地调用它: .say for $a.iterator; 它的作用和以前一样,只是打印$a.iterator的值,而不实际调用该函数: <anon|69>.new 这看起来像the same thing it's going on in this other question。基本问题是我不明白 Iterable 真正...
你应该使用一个更具描述性的名称来定义对象的属性,例如“my_object_attribute”或“my_object_variable”。 总之,“cannot assign to property'self' is immutable”错误提示意味着你在尝试将一个不可变的对象属性分配给一个变量名。要解决这个问题,请确保在定义对象的属性时,避免使用“self”。
问导致"Cannot assign to property：‘QMChatViewController’is immutable“的自我ENstrong，weak, retain...
SwiftUI’s views should be structs, which means they are immutable by default. If this were our own code we could mark methods usingmutatingto tell Swift they will change values, but we can’t do that in SwiftUI because it uses a computed property. ...
In some cases, the error occurs when you work with a third-party library and try to mutate an immutablestateobject. If that's the situation you're in, there is most likely a method, that the library exports, which is used to mutate its state and it shouldn't be done directly by chan...
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这样之后是编译不过的, 会在self = UIImage(named: name, in: B...发生Cannot assign to value: 'self' is immutable报错 解释 首先,请注意此限制仅适用于classes,在structs 和enums中修改自身加上关键字mutating以后就能够了 这种对class初始化器的限制是一个经常出现在这个站点上的痛点(例如)。在 Swift 论...
Ethers Version 6.3.0 Search Terms assign, read only, v6 Describe the Problem I'm working on some examples for Multicall3 with ethers v6, and this line throws with the below error: TypeError: Cannot assign to read only property '0' of obj...
How to fix “Cannot convert value of type 'String' to expected argument type 'Text'" How to fix “Cannot convert value of type '() -> ()' to expected argument type '() -> _’” How to fix “Cannot assign to property: 'self' is immutable” How to fix...