PYTHON empty

is this article helpful?
|
Python replacement for PHP's empty [ edit | history ] 
def empty( variable ):
	if not variable:
		return True
	return False



And if you want to test empty for dictionary with key e.g. dict then- 
def testEmpty(dictionry,key):
	if key in dictionry:
		if dictionry[key]:
			return False
	return True


Example: 
>>> empty( 2 )
False
>>> empty( 0 )
True
>>> empty( [] )
True
>>> empty( True )
False


>>> stud={'name':'ganesh','city':'Pune'}
>>> empty(stud,'name')
False

>>> stud={'name':'ganesh','city':'Pune'}
>>> empty(stud,'Class')
True

PHP empty

PHP original manual for empty [ show | php.net ]

empty

(PHP 4, PHP 5)

empty — Determine whether a variable is empty

Description

bool empty ( mixed $var )

Determine whether a variable is considered to be empty.

Parameters

var

Variable to be checked

Note: empty() only checks variables as anything else will result in a parse error. In other words, the following will not work: empty(trim($name)).

empty() is the opposite of (boolean) var, except that no warning is generated when the variable is not set.

Return Values

Returns FALSE if var has a non-empty and non-zero value.

The following things are considered to be empty:

  • "" (an empty string)
  • 0 (0 as an integer)
  • "0" (0 as a string)
  • NULL
  • FALSE
  • array() (an empty array)
  • var $var; (a variable declared, but without a value in a class)

Changelog

Version Description
PHP 5

As of PHP 5, objects with no properties are no longer considered empty.

PHP 4

As of PHP 4, The string value "0" is considered empty.

Examples

Example #1 A simple empty() / isset() comparison.

<?php
$var = 0;

// Evaluates to true because $var is empty
if (empty($var)) {
    echo '$var is either 0, empty, or not set at all';
}

// Evaluates as true because $var is set
if (isset($var)) {
    echo '$var is set even though it is empty';
}
?>

Notes

Note: Because this is a language construct and not a function, it cannot be called using variable functions

See Also

Variable handling Functions
PHP Manual