Understanding Variable Scope, Global State Sharing, Return Values, and Parameter Patterns in Python
Variable Scope
Local variables are defined inside a function and are only accessible within that function's body. Trying to access a local variable from the outside raises a NameError.
def calculate():
result = 42
print(result)
calculate() # prints 42
# print(result) # NameError: name 'result' is not defined
Global variables are de ...
Posted on Sat, 08 Aug 2026 15:59:19 +0000 by glennn3
Understanding Global and Local Variables, Lambda Functions, and Recursive Functions in Python
name1 = 'dfg'
return
def ChangeGlobalVari2():
name1 = 'dfg'
return
print(name1)
When executing ChangeGlobalVari1(), the output will be dfg.
When executing ChangeGlobalVari2(), the output will be ddd.
If a global variable is of mutable type like a list or dictionary, there's no need to declare it as global.
li = [66] # Mutable type; ...
Posted on Sun, 02 Aug 2026 16:22:51 +0000 by bb_xpress
Resolving Multiple Definition Errors for Global Variables in C
The Problem
When multiple source files include a header that defines global variables, the linker reports multiple definition errors. Consider a header file (main.h) that directly defines global arrays:
#ifndef __MAIN_H
#define __MAIN_H
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define max 100
struct studen ...
Posted on Wed, 24 Jun 2026 17:37:45 +0000 by Scooby08
Global Variables in PHP 7 Internals
In PHP, variables declared outside of functions or classes are considered global. These reside in the main script scope and can be accessed within functions or methods using the global keyword.
function incrementId() {
global $counter;
$counter++;
}
$counter = 1;
incrementId();
echo $counter; // outputs 2
Initialization of Global Vari ...
Posted on Fri, 15 May 2026 22:31:09 +0000 by mcovalt