Question

我试图弄清楚如何纠正错误，因为我不太清楚我是否理解错误发生了什么。

File "/Users/me/PycharmProjects/Project/project/main.py", line 15, in get
    do = Player.pitcher()
TypeError: unbound method pitcher() must be called with Player instance as first argument (got nothing instead)

-

import webapp2
from pages import Page, ContentPage
from data import Player

class MainHandler(webapp2.RequestHandler):
    def get(self):
        page = Page()
        content = ContentPage()
        if self.request.GET:
            id = self.request.GET['id']
            type = self.request.GET['type']
            name = self.request.GET['name']
            if type == 'pitcher':
                pitcher_data = [['1', '22', '2.41', '48', '24'], ['2', '16', '1.98', '61', '0'], ['3', '11', '5.18', '22', '0']]
                do = Player.pitcher()
                do.ip = ''....

        self.response.write(page.print_out())

app = webapp2.WSGIApplication([
    ('/', MainHandler)
], debug=True)


class Player(object):
    def __init__(self):
        self.id = ''
        self.player_name = ''
        self.position = ''

    def fielder(self):
        self.bats = ''
        self.throws = ''
        self.avg = ''
        self.hr = ''
        self.rbi = ''

    def pitcher(self):
        self.ip = ''
        self.era = ''
        self.strikeouts = ''
        self.walks = ''
        self.sv = ''

Answer 1

您在类对象pitcher上调用Player而不是该类的实例。

在Python中，实例化的类（对象）包含字典__dict__形式的实例数据，当它在对象上调用时，它作为第一个参数self传递给方法。

要按原样使用您的代码，正确的调用将是do = Player().pitcher()

这是链式调用的示例... Player()创建并返回包含实例数据字典的Player对象的实例，.pitcher()在新创建的实例上调用pitcher方法。

编辑：再看一下你的示例代码，你可能想要做的就是创建两个不同的对象，这些对象继承了一些常见的状态。这可以使用子类来完成。

例如：

class Player(object):
    def __init__(self):
        self.id = ''
        self.player_name = ''
        self.position = ''

class Fielder(Player):
    def __init__(self):
        super(Fielder, self).__init__()  # Call the constructor for the Player base class
        self.bats = ''
        self.throws = ''
        self.avg = ''
        self.hr = ''
        self.rbi = ''

class Pitcher(Player):
    def __init__(self):
        super(Pitcher, self).__init__()  # Call the constructor for the Player base class
        self.ip = ''
        self.era = ''
        self.strikeouts =''
        self.walks = ''
        self.sv = ''

现在在您的主要代码中，您可以执行类似

的操作

if type == 'pitcher':
    player = Pitcher()
    player.ip = <some value>
    ...
elif type == 'fielder':
    player = Fielder()
    player.bats = <some value>
... etc ...

Answer 2

在调用函数之前将@staticmethod添加到投手函数或创建一个Player实例

具有类实例的未绑定方法

2 个答案: