Python develops "first" python-based reflection

Reflection

Reflection: The effect of reflection is to increase the readable line of code.

__import__ the difference between Import module and import module:

The __import__ import module is imported through a string. Import is a common method of importing modules.

4 built-in functions are commonly used for reflection: GetAttr, Hasattr, SetAttr, delattr get members, check members, set members, delete members.

Instance:

The initial module invocation is this:

# commons.pydef Login ():    print (' Cool login page ') def logout ():    print (' Cool Exit page ') def home ():    print (' Cool homepage ') # Index.pyimport Commonsdef Run ():    INP = input (' Please enter the URL to access: ')    if inp = = ' Login ':        commons.login ()    elif INP = = ' Logout ':        commons.logout ()    elif InP = = ' Home ':        commons.home ()    else:        print (' 404 ')

After using the reflection is this:

#commons. Pydef Login ():    print (' Cool login page ') def logout ():    print (' Cool Exit page ') def home ():    print (' Cool homepage ') # Index.pyimport Commonsdef Run ():    INP = input (' Please enter the URL to access: ')    # INP String Type INP = "Login"    # Use the form of a string to manipulate (Find/check/delete/set) a member # delattr () # setattr ()    if Hasattr (Commons, INP) in an object (module):        func = GetAttr (commons,inp        func ()    else:        print (' 404 ') if __name__ = = ' __main__ ':    run ()

Modules can also be imported via strings:

def run ():    # account/login    INP = input (' Please enter URL to access: ')    # INP String Type INP = "Login"    # Use the form of a string to manipulate (Find/check/delete/set) the member    # delattr ()    # setattr ()    m, f = inp.split ('/')    obj = __import__ ( m)    if hasattr (obj, f):        func = getattr (obj,f)        func ()    else:        print (' 404 ') if __name__ = = ' __main __ ':    run ()

For reflection subsections:

1. Import the module according to the form of the string. 2. The object (a module) is manipulated by its members in the form of a string.

Python develops "first" python-based reflection