《Python》反射、内置函数(__str__、__repr__)
2021-07-09 11:05
标签:oldboy asa 数据 static open *args eal The store 一、反射 通过字符串的形式操作对象相关的属性。(使用字符串数据类型的变量名来获取这个变量的值) Python中的一切事物都是对象(都可以使用反射) 《Python》反射、内置函数(__str__、__repr__) 标签:oldboy asa 数据 static open *args eal The store 原文地址:https://www.cnblogs.com/yzh2857/p/9567252.html#hasattr
def hasattr(*args, **kwargs): # real signature unknown
"""
Return whether the object has an attribute with the given name.
This is done by calling getattr(obj, name) and catching AttributeError.
"""
pass
#getattr
def getattr(object, name, default=None): # known special case of getattr
"""
getattr(object, name[, default]) -> value
Get a named attribute from an object; getattr(x, ‘y‘) is equivalent to x.y.
When a default argument is given, it is returned when the attribute doesn‘t
exist; without it, an exception is raised in that case.
"""
pass
#setattr
def setattr(x, y, v): # real signature unknown; restored from __doc__
"""
Sets the named attribute on the given object to the specified value.
setattr(x, ‘y‘, v) is equivalent to ``x.y = v‘‘
"""
pass
#delattr
def delattr(x, y): # real signature unknown; restored from __doc__
"""
Deletes the named attribute from the given object.
delattr(x, ‘y‘) is equivalent to ``del x.y‘‘
"""
pass
# 反射类中的变量: 静态属性、类方法、静态方法
class Foo:
school = ‘oldboy‘
country = ‘china‘
language = ‘chiness‘
@classmethod
def class_method(cls):
print(cls.school)
@staticmethod
def static_method():
print(‘in staticmethod‘)
def wahaha(self):
print(‘wahaha‘)
print(Foo.school) # oldboy
print(Foo.country) # china
print(Foo.language) # chiness
# 判断实现
inp = input(‘>>>‘)
if inp == ‘school‘: print(Foo.school) # oldboy
elif inp == ‘country‘: print(Foo.country) # china
elif inp == ‘language‘: print(Foo.language) # chiness
# 反射实现
while 1:
inp = input(‘>>>‘) # 输school,打印oldboy 输country,打印china 输language,打印chiness
print(getattr(Foo,inp))
# 解析getattr方法
print(getattr(Foo,‘school‘)) # oldboy
Foo.class_method() # oldboy
print(getattr(Foo,‘class_method‘)) #
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文章标题:《Python》反射、内置函数(__str__、__repr__)
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