diff options
| -rw-r--r-- | zh-cn/python3-cn.html.markdown | 33 |
1 files changed, 15 insertions, 18 deletions
diff --git a/zh-cn/python3-cn.html.markdown b/zh-cn/python3-cn.html.markdown index 1f294ebb..4059c876 100644 --- a/zh-cn/python3-cn.html.markdown +++ b/zh-cn/python3-cn.html.markdown @@ -123,8 +123,7 @@ False or True #=> True # None是一个对象 None # => None -# Don't use the equality "==" symbol to compare objects to None -# Use "is" instead. This checks for equality of object identity. +# 当与None进行比较时不要用 ==，要用is。is是用来比较两个变量是否指向同一个对象。 "etc" is None # => False None is None # => True @@ -482,52 +481,50 @@ filter(lambda x: x > 5, [3, 4, 5, 6, 7]) # => [6, 7] #################################################### -# We subclass from object to get a class. +# 定义一个继承object的类 class Human(object): - # A class attribute. It is shared by all instances of this class + # 类属性，被所有此类的实例共用。 species = "H. sapiens" - # Basic initializer, this is called when this class is instantiated. - # Note that the double leading and trailing underscores denote objects - # or attributes that are used by python but that live in user-controlled - # namespaces. You should not invent such names on your own. + # 构造方法，当实例被初始化时被调用。注意名字前后的双下划线，这是表明这个属 + # 性或方法对Python有特殊意义，但是允许用户自行定义。你自己取名时不应该用这 + # 种格式。 def __init__(self, name): # Assign the argument to the instance's name attribute self.name = name - # An instance method. All methods take "self" as the first argument + # 实例方法，第一个参数总是self，就是这个实例对象 def say(self, msg): return "{name}: {message}".format(name=self.name, message=msg) - # A class method is shared among all instances - # They are called with the calling class as the first argument + # 类方法，被所有此类的实例共用。第一个参数是这个类对象。 @classmethod def get_species(cls): return cls.species - # A static method is called without a class or instance reference + # 静态方法。调用时没有实例或类的绑定。 @staticmethod def grunt(): return "*grunt*" -# Instantiate a class +# 构造一个实例 i = Human(name="Ian") -print(i.say("hi")) # prints out "Ian: hi" +print(i.say("hi")) # 印出 "Ian: hi" j = Human("Joel") -print(j.say("hello")) # prints out "Joel: hello" +print(j.say("hello")) # 印出 "Joel: hello" -# Call our class method +# 调用一个类方法 i.get_species() # => "H. sapiens" -# Change the shared attribute +# 改一个共用的类属性 Human.species = "H. neanderthalensis" i.get_species() # => "H. neanderthalensis" j.get_species() # => "H. neanderthalensis" -# Call the static method +# 调用静态方法 Human.grunt() # => "*grunt*" |