Var范围Python [重复]

Question

This question already has an answer here:

• Short description of the scoping rules? 8 answers

In python is every variable defined as a global scope? Can someone explain variable scope for python with the following example? This is for python 2.7 but I wouldn't mind a python 3 explanation

Python

test = [1,2,3]

print test

def fun():
    print test

fun()

Output:

[1, 2, 3] 
[1, 2, 3] 

PHP

<?php

$test = [1,2,3];

var_dump($test);


function fun()
{
   var_dump($test); 
}

fun();
?>

Output:

array(3) {
  [0]=>
  int(1)
  [1]=>
  int(2)
  [2]=>
  int(3)
}
NULL
PHP Notice:  Undefined variable: test in /home/coderpad/solution.php on line 10

EDIT Saw this post Python class scoping rules but I am still confused.

</div>

Answer 1

You defined a global variable test in Python and global variables are accessible in functions. To achieve the same effect in PHP, you would have to write:

<?php

$test = [1,2,3];

var_dump($test);


function fun()
{
   global $test; // <---- add this
   var_dump($test); 
}

fun();

to achieve the same effect. You can find more information about Python variable scope here.