checking for negative values in a list

[vimal]

hi all,

i am new to python guys.
hope u will help me with this....

i have a list of numbers

say a = [1,-1,3,-2,4,-6]

how should i check for negative values in the list

 

[Marc 'BlackJack' Rintsch]

i have a list of numbers

say a = [1,-1,3,-2,4,-6]

how should i check for negative values in the list

In [6]: a = [1, -1, 3, -2, 4, -6]

In [7]: any(n < 0 for n in a)
Out[7]: True

Ciao,
Marc 'BlackJack' Rintsch

 

[Tim Chase]

i am new to python guys.

i have a list of numbers

say a = [1,-1,3,-2,4,-6]

how should i check for negative values in the list

I'm not sure if this is a homework problem, as it seems to be a
fairly simple programming problem whether you know Python or not.

If you're using 2.5 or more recent, you should be able to do
something like

if any(x < 0 for x in a):
yep()
else:
nope()

If "a" is small, you could do

if [x for x in a if x < 0]:
yep()
else:
nope()

Or you could write your own function:

def has_negatives(iterable):
for x in iterable:
if x < 0: return True
return False

if has_negatives(a):
yep()
else:
nope()

-tkc

 

[vimal]

thanks for your help Tim and Marc.