A community for students.
Here's the question you clicked on:
 0 viewing
 2 years ago
Why does this print 4?
http://dpaste.com/779443/
Shouldn't it need a line inside the function like "global a", so "a" is in the function scope and not only in the main scope?
 2 years ago
Why does this print 4? http://dpaste.com/779443/ Shouldn't it need a line inside the function like "global a", so "a" is in the function scope and not only in the main scope?

This Question is Closed

lopus
 2 years ago
Best ResponseYou've already chosen the best response.0this print 4 because your code is very simple. in python you variable "a" is global Every time a function gets called, Python creates a new function frame, which contains the function's local variables and parameters. global a > 1.. never change within the function you create variable "a" applies only to the function

choutos
 2 years ago
Best ResponseYou've already chosen the best response.1Because your function "f(x)" add the value of x to the value of a (which is always 1).

anzaq
 2 years ago
Best ResponseYou've already chosen the best response.0so simple 4... f send 3 as arguments to f which add 1 and return it to print and it prints it

David_Novo
 2 years ago
Best ResponseYou've already chosen the best response.0For your answers I can see that I didn't express myself well. My question is related to the use of "global" and scopes. In that code we have: Main Scope:  a  f(x) f(x) Scope:  x So the object a is not in the function scope. How can the function use it without a "global a" line in the function?

choutos
 2 years ago
Best ResponseYou've already chosen the best response.1The point is that works in the other way: 'a' is a global variable because is declared in the main program, then it is in the scope of the whole program (functions included). And you can use "global var" in the function definition to make the variable global and share that variable to use in other functions (even the main function).

David_Novo
 2 years ago
Best ResponseYou've already chosen the best response.0I just ran some experiments and reached some conclusions that need confirmation. Objects in outermost scopes can always be used in inner scopes without using "global"? If f(x) and g(x) are too independent functions, to use in g an object created inside f we need to write "global object" in f?

David_Novo
 2 years ago
Best ResponseYou've already chosen the best response.0That confirms what I suspected from recent results. Really thanks choutos and everyone else.
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.