英文:
Where does Package.Name come from?
问题
[package.name]只是键的变量名，package.name是从package对象中获取的。
英文:
In the add_packages method below, is [package.name] just a variable name for the key? Where do we get package.name from?
class Repository:
def __init__(self):
self.packages = {}
def add_package(self, package):
self.packages[package.name] = package
答案1
得分: 1
package.name 是一个 表达式；表达式的值是 package 所引用的对象的 name 属性的值。package 是 add_package 方法的一个参数名称。当你 调用 这个方法时，你提供的值作为参数与名称 package 绑定。
例如，
class Package:
def __init__(self, name):
self.name = name
p = Package("foo") # p.name == "foo"
r = Repository()
r.add_package(p) # self.packages["foo"] = p
英文:
package.name is an expression; the value of the expression is the value of the name attribute of whatever object package refers to. package is the name of a parameter of the add_package method. When you call this method, the value you provide as an argument is bound to the name package.
For example,
class Package:
def __init__(self, name):
self.name = name
p = Package("foo") # p.name == "foo"
r = Respository()
r.add_package(p) # self.packages["foo"] = p
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