python 出现 type object 'xxxxx' has no attribute 'xxxx'，什么原因

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最新推荐文章于 2025-05-31 18:03:10 发布

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本文展示了一个关于资产交易的Python类设计实例，包括基本的资产类及其子类——不可卖空资产类。通过这些类定义了买入和卖出操作，并在子类中增加了额外的卖出限制检查。

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from datetime import datetime
class Asset(object):
    share=0
    buyTime=datetime.strpdatetime('2018-08-18','%Y-%m-%d')
    sellTime=datetime.strpdatetime('2018-08-19','%Y-%m-%d')
    def __init__(self,id,price):
        self.id=id
        self.price=price
    def buy(self,share,time):
        self.share+=share
        self.buyTime=datetime.strptime(time,'%Y-%m-%d')
    def sell(self,share,time):
        self.share-=share
        self.sellTime=datetime.strptime(time,'%Y-%m-%d')
class NonShortableAsset(Asset):
    def sell(self,share,time):
        if self.share>=share:
            self.share-=share
            self.sellTime=datetime.strptime(time,'%Y-%m-%d')
        else:
            print('Not permitted! There are not enough share to sell!')
            print('Current share is ',self.share)
            return
        
Traceback (most recent call last):

  File "<ipython-input-19-48d006ea31a9>", line 2, in <module>
    class Asset(object):

  File "<ipython-input-19-48d006ea31a9>", line 4, in Asset
    buyTime=datetime.strpdatetime('2018-08-18','%Y-%m-%d')

AttributeError: type object 'datetime.datetime' has no attribute 'strpdatetime'

Traceback (most recent call last):

File "<ipython-input-19-48d006ea31a9>", line 2, in <module>
class Asset(object):

File "<ipython-input-19-48d006ea31a9>", line 4, in Asset
buyTime=datetime.strpdatetime('2018-08-18','%Y-%m-%d')

AttributeError: type object 'datetime.datetime' has no attribute 'strpdatetime'