Python--inspect Module

The inspect module provides four main uses:

1. Type check for module, frame, function

2. Get the source code

3. Get parameter information for a class or function

4. Parsing the Stack

I. Type and members

1. Inspect. GetMembers (object[, predicate])

The second parameter can usually call the following 16 methods as required;

Returns a list of all members that have a value of object, in (name,value) pairs

2. Inspect.ismodule (object): Whether it is a module

4. Inspect.isclass (object): Whether it is a class

6. Inspect.ismethod (object): Whether it is a method (bound written in Python)

8. Inspect.isfunction (object): Whether it is a function (Python function, including lambda expression)

10. Inspect.isgeneratorfunction (object): Whether it is a Python generator function

12. Inspect.isgenerator (object): Whether it is a generator

14. Inspect.istraceback (object): Whether it is traceback

16. Inspect.isframe (object): Whether it is a frame

18. Inspect.iscode (object): Whether it is a code

20. Inspect.isbuiltin (object): Whether it is a built-in function or a built-in method

22. Inspect.isroutine (object): Whether the user has customized or built-in functions or methods

24. Inspect.isabstract (object): Whether it is an abstract base class

26. Inspect.ismethoddescriptor (object): is the method identifier

28. Inspect.isdatadescriptor (object): Whether it is a numeric identifier, a numeric identifier has __get__ and __set__ properties, and usually __name__ and __doc __ Property

30. Inspect.isgetsetdescriptor (object): Whether it is Getset descriptor

32. Inspect.ismemberdescriptor (object): Whether it is member descriptor

The inspect GetMembers () method can get the following properties of the object (module, class, method, and so on):

Type	Attribute	Description	Notes
Module	__doc__	Documentation string
	__file__	FileName (missing for built-in modules)
Class	__doc__	Documentation string
	__module__	Name of module in which this class is defined
Method	__doc__	Documentation string
	__name__	Name with which this method is defined
	Im_class	Class object, asked for this method	(1)
	Im_func or __func__	function object containing implementation of method
	Im_self or __self__	instance to which this method is bound, or None
function	__doc__	Documentation string
	__name__	Name with which this function is defined
	Func_code	Code object containing compiled function bytecode
	Func_defaults	Tuple of any default values for arguments
	Func_doc	(Same as __DOC__)
	Func_globals	Global namespace in which this function is defined
	Func_name	(Same as __NAME__)
Generator	__iter__	Defined to support iteration over container
	Close	Raises new Generatorexit exception inside the generator to terminate the iteration
	Gi_code	Code Object
	Gi_frame	Frame object or possibly None once the generator has been exhausted
	Gi_running	Set to 1 when generator is executing, 0 otherwise
	Next	Return the next item from the container
	Send	Resumes the generator and "sends" a value that becomes the result of the current yield-expression
	Throw	Used to raise an exception inside the generator
Traceback	Tb_frame	Frame object at the This level
	Tb_lasti	Index of last attempted instruction in bytecode
	Tb_lineno	Current line number in Python source code
	Tb_next	Next inner Traceback object (called by)
Frame	F_back	Next Outer frame object (this frame ' s caller)
	F_builtins	Builtins namespace seen by this frame
	F_code	Code object being executed in the This frame
	F_exc_traceback	Traceback if raised in the this frame, or None
	F_exc_type	Exception type if raised in the this frame, or None
	F_exc_value	Exception value if raised in the this frame, or None
	F_globals	Global namespace seen by this frame
	F_lasti	Index of last attempted instruction in bytecode
	F_lineno	Current line number in Python source code
	F_locals	Local namespace seen by this frame
	f_restricted	0 or 1 if frame is in restricted execution mode
	F_trace	Tracing function for the this frame, or None
Code	Co_argcount	Number of arguments (not including * or * * args)
	Co_code	String of raw compiled bytecode
	Co_consts	Tuple of constants used in the bytecode
	Co_filename	Name of file in which this code object is created
	Co_firstlineno	Number of first line in Python source code
	Co_flags	bitmap:1=optimized | 2=newlocals | 4=*arg | 8=**arg
	Co_lnotab	Encoded mapping of line numbers to bytecode indices
	Co_name	Name with which this code object is defined
	Co_names	Tuple of names of local variables
	Co_nlocals	Number of local variables
	Co_stacksize	Virtual Machine stack space required
	Co_varnames	Tuple of names of arguments and local variables
Builtin	__doc__	Documentation string
	__name__	Original name of this function or method
	__self__	instance to which a method is bound, or None

2. Inspect. Getmoduleinf o (path): Returns a named tuple <named tuple> (name, suffix, mode, module_type)

Name: module name (excluding the package it resides in)

Suffix

Mode of the Mode:open () method, such as: ' R ', ' a ', etc.

Module_type: Integer that represents the type of the module

3. Inspect. Getmodulename (path): Returns the module name based on path (excluding the package it resides in)

Second, retrieving source code

1. Inspect. Getdoc (object): Gets the documentation information for object

2. Inspect. getcomments (object)

3. Inspect. GetFile (object): Returns the file name of the object

4. Inspect. GetModule (object): Returns the module name to which the object belongs

5. Inspect. Getsourcefile (object): Returns the Python source file name of object, object cannot make built-in module, class, Mothod

6. Inspect. Getsourcelines (object): Returns the contents of the Python source file code for object, line number + line of code

7. Inspect. GetSource (object): Returns the source code of object as a string

8. Inspect. Cleandoc (doc):

Iii. class and functions

1. Inspect. Getclasstree (classes[, unique])

2. Inspect. Getargspec (func)

3. Inspect. getargvalues (frame)

4. Inspect. Formatargspec (args[, varargs, varkw, defaults, Formatarg, Formatvarargs, formatvarkw, Formatvalue, join])

5. Inspect. formatargvalues (args[, VarArgs, varkw, locals, Formatarg, Formatvarargs, formatvarkw, Formatvalue, join])

6. Inspect. Getmro (cls): The tuple form returns the base class of the CLS class (including the CLS Class), in method resolution order, usually the CLS class as the first element of the element

7. Inspect. Getcallargs (func[, *args][, **kwds]): Converts the args and Kwds parameters to the name of the parameter that is bound to Func, and the bound method, Also binds the first argument (usually self) to the corresponding instance, and returns the dictionary, corresponding to the parameter name and its value;

>>>FromInspectImportGetcallargs>>>DefF(A,B=1,*Pos,**Named):...Pass>>>Getcallargs(F123) {' a ': 1, ' named ': {}, ' B ': 2, ' POS ': (3,)}>>>  Getcallargs (fa= 2x=4 {' a ': 2, ' named ': {' x ': 4}, ' B ': 1, ' pos ': ()}>>> getcallargs (f) traceback (most recent call last):  ... typeerror: f () takes at least 1 argument (0 given) 
 
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Iv. The Interpreter stack

1. Inspect. Getframeinfo (frame[, context])

2. Inspect. Getouterframes (frame[, context])

3. Inspect. Getinnerframes (traceback[, Context])

4. Inspect. Currentframe ()

5. Inspect. Stack ([context])

6. Inspect. Trace ([context])

Python--inspect Module