python Python对象创建
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Python object creation
提问by sunqiang
I am pretty new to Python world and trying to learn it.
我对 Python 世界很陌生，并试图学习它。
This is what I am trying to achieve: I want to create a Car class, its constructor checks for the input to set the object carName as the input. I try to do this by using the java logic but I seem to fail :)
这就是我想要实现的目标：我想创建一个 Car 类，它的构造函数检查输入以将对象 carName 设置为输入。我尝试通过使用 java 逻辑来做到这一点，但我似乎失败了 :)
class Car():
carName = "" #how can I define a non assigned variable anyway like "String carName;" in java
def __self__(self,input):
self.carName = input
def showName():
print carName
a = Car("bmw")
a.showName()
回答by sunqiang
derived from object for new-style class
use __init__to initialize the new instance, not __self____main__is helpful too.
派生自 object 用于新式类
用于__init__初始化新实例，也不__self____main__是很有帮助。
class Car(object):
def __init__(self,input):
self.carName = input
def showName(self):
print self.carName
def main():
a = Car("bmw")
a.showName()
if __name__ == "__main__":
main()
回答by MrHus
You don't define a variable, and you use initand self. Like this:
您不定义变量，而是使用init和 self。像这样：
class Car(Object):
def __init__(self,input):
self.carName = input
def showName(self):
print self.carName
a = Car("bmw")
a.showName()
回答by MrHus
this is not correct!
这是不正确的！
class Car():
carName = "" #how can I define a non assigned variable anyway like "String carName;" in java
def __self__(self,input):
self.carName = input
the first carName is a class Variablelike static member in c++
第一个 carName 是类变量，类似于 C++ 中的静态成员
the second carName (self.carName) is an instance variable, if you want to set the class variablewith the constructor you have to do it like this:
第二个 carName (self.carName) 是一个实例变量，如果你想用构造函数设置类变量，你必须这样做：
class Car():
carName = "" #how can I define a non assigned variable anyway like "String carName;" in java
def __self__(self,input):
Car.carName = input
