Python Basics-Seventh-7.3 Reflections

Defines a reflection to manipulate its members according to the form of a string

Before I know about reflection, I'll look at the built-in method __import__, remember this built-in method?

• __import__ for importing modules as strings

INP = input (' Please enter the module you want to import:'__import__(INP)  #Import XML as Mokuaiprint(Mokuai.  __doc__)

• GetAttr is used to search for functions in a module as a string

Import= input (' Please enter the method you want to perform under Re:'= getattr (re,str_func) Print # Print the memory address of the function found

Reflection Members

• GetAttr is used to search for functions in a module as a string

Import= input (' Please enter the method you want to perform under Re:'= getattr (re,str_func,none)  # found on the return function, did not find on the return none, not set none, no error found Print # Print the memory address of the function found

• Hasattr a module to see if there is something in the form of a string

Import= hasattr (Re,'match')print= hasattr (re ,'fjfijajfojg')print(Ret2)

• SetAttr Settings

R = Hasattr (Commons,'age')print(r)  #False SetAttr (Commons,'age',Lambda a:a + 1= GetAttr (Commons,'  age ')  # no error ret = R (1)print(ret)

• Delattr Delete

Example: Routing system for web framework

 from Import  = input (' Please enter URL:'= url.split ('/') [-1 ]if  hasattr (ACCOUNT,INP):    = getattr (ACCOUNT,INP)    func () Else :     Print ('404')

url = input ('Please enter a URL:') Target_module,target_func= Url.split ('/') M=__import__('lib.'+target_module,fromlist=True)ifhasattr (m,target_func): Tar_func=GetAttr (m,target_func) R=Tar_func ()Print(R)Else:    Print('404')

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Author: Pat Province Mr.

Python Basics-Seventh-7.3 Reflections