Python魔法函数

你的名字 2022-09-01 09:10 101阅读 0赞

class Company(object):
        def __init__(self,employee_list):
            self.employee=employee_list
    
    
    
    company=Company(['tim','bob','janw'])
    
    emploee=company.employee
    for em in emploee:
        print(em)
        '''
        tim
        bob
        janw
        
        '''
    
    #魔法函数
    class Company(object):
        def __init__(self, employee_list):
            self.employee = employee_list
    
        def __getitem__(self, item):
            # item=index
            return self.employee[item]
    
    
    company = Company(['tim', 'bob', 'janw'])
    
    # emploee=company.employee
    #for em in emploee:
    for em in company:
        print(em)
        '''
        tim
        bob
        janw
    
        '''

# 魔法函数  __str__
    class Company(object):
        def __init__(self, employee_list):
            self.employee = employee_list
    
        def __str__(self):
            # item=index
            return ",".join(self.employee)
    
    
    company = Company(['tim', 'bob', 'janw'])
    print(company )
    '''tim,bob,janw'''

# 魔法函数  __str__
    class Company(object):
        def __init__(self, employee_list):
            self.employee = employee_list
    
        def __repr__(self):
            # item=index
            return ",".join(self.employee)
    
    
    company = Company(['tim', 'bob', 'janw'])
    print(company)
    
    '''tim,bob,janw'''

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70][]

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使用多方法的多态：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70 2][]

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![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70 4][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70 5][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70 6][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70 7][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70 8][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70 9][]

上面的抛异常

下面的实现了具体方法 不抛异常

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70 10][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70 11][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70 12][]

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