Python魔法函数

你的名字 2022-09-01 09:10 154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][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70 1][]

使用多方法的多态：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70 2][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70 3][]

![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][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70 13][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70 14][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70 15][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70 16][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70 17][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70 18][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70]: /images/20220829/bdd91fad26034e44a794f0e5d271f0cc.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70 1]: /images/20220829/9f371bfac2364d3db4ebf8e037c345b5.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70 2]: /images/20220829/e15baa52de244c91aed50a03f8ec258c.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70 3]: /images/20220829/216928b519eb4646bec373133c967b4c.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70 4]: /images/20220829/f01ed201e38c4b6f838da240f717e8a9.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70 5]: /images/20220829/4acccde63585473f9d09b532f685b2db.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70 6]: /images/20220829/f493aa9418804af9a42c4832ebf0438b.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70 7]: /images/20220829/95a010c43d9a4c19892c8b18adca9496.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70 8]: /images/20220829/b4ca6d605c5046d18aff36c1d473a81e.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70 9]: /images/20220829/9cbbc175ac8e4c339dac517684d0d097.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70 10]: /images/20220829/03973b029f7e4e5b81c3aa854bfffa88.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70 11]: /images/20220829/5e2341356bff4b67aaa9e989c89e7221.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70 12]: /images/20220829/716a5d5940174d97adb8deadac6e6bc1.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70 13]: /images/20220829/4dcae8553ae94435927f40e78e1b425b.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70 14]: /images/20220829/ac8bd3aeca824d13ad9641063de7d828.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70 15]: /images/20220829/db62625848a84f9abb58f255c1cb24da.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70 16]: /images/20220829/2abe345d9729401ba54f3eab6a22d88a.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70 17]: /images/20220829/79cb2716b8084f8b918c2279e6c52fe4.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70 18]: /images/20220829/362f3126499344eba1e769964be09126.png