Tools, FAQ, Tutorials:
What Is Wrapper Function
What is a wrapper function in Python?
✍: FYIcenter.com
A wrapper function in Python is a function that takes an old function as input parameter and returns a new function.
The new function should have the same parameter list and return type.
If you call the new function, it will perform the same task as the old function and do some more activities.
The Python code below shows you a good example of a wrapper function called "wrapper()". It return a newDump() function when call it as wrapper(dump). The newDump() calls the old dump() and adds XML output:
>>> def dump(user): ... print(user) ... >>> def wrapper(dump): ... def newDump(user): ... x = dump(user) ... print("<root>") ... for item in user: ... print("<"+item+">"+str(user[item])+"</"+item+">") ... print("</root>") ... return x ... return newDump ... >>> guest = {"name": "Joe", "age": 25} >>> dump(guest) {'name': 'Joe', 'age': 25} >>> >>> dumpWrapped = wrapper(dump) >>> dumpWrapped(guest) {'name': 'Joe', 'age': 25} <root> <name>Joe</name> <age>25</age> </root>
You can say that dumpWrapped() is the new version of dump() modified by the wrapper function wrapper().
⇐ Pass Function as Function Parameter
2018-02-08, 2030🔥, 0💬
Popular Posts:
What is test testing area for? The testing area is provided to allow visitors to post testing commen...
How To Convert a Character to an ASCII Value? If you want to convert characters to ASCII values, you...
Where to find tutorials on JSON (JavaScript Object Notation) text string format? I want to know how ...
Where to find tutorials on Visual Studio? I want to know How to learn Visual Studio. Here is a large...
What Is HTML? HTML (HyperText Markup Language) is the standard markup language for creating Web page...