13.01python Language Foundation (META Class)

Classes in Python are also objects that create an object whenever the Class,python interpreter is executed using the keyword.

Class Test (object):

Pass

Test = Test ()

Print (test)

Determines whether an object is---> in a class

Hasattr (OBJ,STR)

Class Test (object):

Pass

Test = Test ()

Print (test)

Print (test)

def info (o):

Print (o)

You can pass a class as a parameter to a function

Info (test)

You can add a new property to a class:

Class Test (object):
    Pass
Test = Test ()
Print (test)
Print (Test)

def info (o):
    Print (o)

Info (test)

Print (Hasattr (Test, ' new attribute '))
Test.new_attribute = ' haha '
Print (Hasattr (Test, ' New_attribute '))
Print (Test.new_attribute)

Operation Result:

<__main__. Test Object at 0x00000198f952c198>
<class ' __main__. Test ' >
<__main__. Test Object at 0x00000198f952c198>
False
True
haha

Note: Determine whether an object is in a class, using HASATTR, Format hasattr (OBJ,STR)

13. 02python Language Fundamentals (dynamically created classes)

Dynamically creating classes

def choose_name (name):

If name = = ' Haha '

class Haha (object):

Pass

return haha

else:

Class Heihei (object):

Pass

Return Heihei

My_class = choose_name (' haha ')

Print (My_class)

Print (My_class ())

13.01python Language Foundation (META Class)