Python> diese werden alle als falsch betrachtet:

@ Introducing Python: Modern Computing in Simple Packages by Bill Lubanovic (No. 2045 / 12833)

A false value doesn't necessarily need to explicitly be False. For example, these are all considered False:


boolean	False
null	None
zero integer	0
zero float	0.0
empty string	''
empty list	[]
empty tuple	()
empty dict	{}
empty set	set()

Anything else is considered True.

Ich habe es versucht.

http://ideone.com/fTS6kQ

def check_empty(something):
	if something:
		print('Not Empty')
	else:
		print('Is Empty')
	
alist = []
check_empty(alist)
alist.append('7of9')
check_empty(alist)

aint = 0
check_empty(aint)
aint = 314
check_empty(alist)

`Ergebnis`


Success	time: 0 memory: 23304 signal:0
Is Empty
Not Empty
Is Empty
Not Empty