Python_day6_ Reflection _ Regular expression of the article

First, reflection

definition: use a string to manipulate (Find/check/delete/set) members in objects (modules)

#getattr: Get Properties in module

#hasattr: Checks if a member (function) exists in the module

#delattr: Remove members from a module

#setattr: Set a block in the

Common Reflection modes:

Import fanshe_commons   #导入访问函数的模块 "fanshe_commons module with functions such as Login,logout,home" Def Run (): INP = input ("Please enter access URL:") if INP = = ' Login ':  #fanshe_commons. Login ()  #调用fanshe_commons模块中login函数, when the input input URL is login, execute the login function, At this time than forget to execute function to take login () elif INP = = ' Logout ': fanshe_commons.logout () elif InP = = ' Home ': Fanshe_commons.home () Else:print (" 404 ") if __name__ = = ' __main__ ':  #if __name__ = = ' __main__ ' indicates that the main function is executed only in the current module run ()

Reflective class 02:

Hasattr: Checks if a member (function) exists in the module

#getattr: Get Properties in module

Import  fanshe_commons  # #导入访问函数的模块  fanshe_commons a block containing the Login,logout,home function Def run (): InP =input (" Please enter the URL to access: ") #inp属于一个字符串, then FANSHE_COMMONS.INP ()! = Fanshe_commons.login () if Hasattr (FANSHE_COMMONS,INP): # #hasattr : Check if a member (function) func = GetAttr (FANSHE_COMMONS,INP) is present in the module #getattr: Gets the property in the module func () else:print ("404") if __name__ = = ' __main__ ': Run ()

　　Reflective Class 03:

Apply the "_import_" method: You can call the methods in multiple modules, without having to import a block

Format: #模块/method

Import  fanshe_commons  # #导入访问函数的模块  fanshe_commons a block containing login,logout,home function def run (): #commons/login     Note: In the output mode also need to follow "a block/method" of InP =input ("Please enter the URL to access:") #inp属于一个字符串, then FANSHE_COMMONS.INP ()! = Fanshe_commons.login () m , F = inp.split ('/')  #将mn比作为一个模块, F is a function or member of this module, obj = __import__ (m)   #将模赋值给一个值if hasattr (obj,f): # #hasattr: Check if a member (function) func = GetAttr (obj,f) is present in the module #getattr: Gets the property in the module func () else:print ("404") if __name__ = = ' __main__ ': Run ()

　　

class 04: Import functions in different folders

# obj = __import__ ("lib." +m,fromlist=true)  #导入两个不同的文件夹中的函数

Import  fanshe_commons  # #导入访问函数的模块  fanshe_commons a block containing login,logout,home function def run (): #commons/login     Note: In the output mode also need to follow "a block/method" of InP =input ("Please enter the URL to access:") #inp属于一个字符串, then FANSHE_COMMONS.INP ()! = Fanshe_commons.login () m , F = inp.split ('/')  #将mn比作为一个模块, F is the function or member of this module # obj = __import__ (m)   #将模赋值给一个值obj = __import__ ("lib." +m,fromlist=true)  #导入两个不同的文件夹中的函数if hasattr (obj,f): # #hasattr: Checks for a member (function) in the module func = GetAttr (obj,f) # GetAttr: Get module in attribute func () else:print ("404") if __name__ = = ' __main__ ': Run ()

　Extended

Several common ways to import modules are:

A:import XXX Module

B:from xxx Folder Import + method

C:obj = _import_ ("module")

D:obj = _import_ ("folder. oo.xx", fromlist=true)

Second, the regular expression

Three

Python_day6_ Reflection _ Regular expression of the article