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+--- Thread: get positive number from a list if there's the same number but negative (/thread-6129.html)
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RE: get positive number from a list if there's the same number but negative - haye - Nov-07-2017
yes, sorry, i meant : "if m in lis and -m in lis:"
but anyways, you're right, i just need " if -m in lis: "
thanks for help
RE: get positive number from a list if there's the same number but negative - heiner55 - Nov-07-2017
You wrote in your first post:
Is there a simpler way?
What do you mean with simple:
a. less code
b. code should run faster
If b:
Your code runs twice over the list.
I assume there is an algorithm
that runs only once over the list.
RE: get positive number from a list if there's the same number but negative - haye - Nov-07-2017
i wanted a shorter code but doing the same as the one i used firstly which was :
list_one = [-8, 8, 144, 17]
def test(lis):
m = min(lis, key=abs)
if m < 0:
if m and m*-1 in lis:
return m*-1
else:
return m
else:
return m
print test(list_one)now i have:list_one = [-8, 8, 144, 17]
def test(lis):
m = min(lis, key=abs)
if -m in lis:
return abs(m)
else:
return m
print test(list_one)
RE: get positive number from a list if there's the same number but negative - heiner55 - Nov-07-2017
def test(lis): m = min(lis, key=abs) return abs(m) if -m in lis else m
RE: get positive number from a list if there's the same number but negative - ineedastupidusername - Nov-08-2017
code loops through list once and seems to handle all cases (just returns [0] if there's a zero in there etc):a=[-16,4,16,7,-4]
def getzeroclosest(a):
negmax=None
posmin=None
for n in a:
if n==0:
return [0]
elif n<0:
if negmax==None:
negmax=n
if n>negmax:
negmax=n
elif n>0:
if posmin==None:
posmin=n
if n<posmin:
posmin=n
if -negmax==posmin:
return [posmin,negmax]
elif -negmax<posmin:
return [negmax]
else:
return [posmin]
print getzeroclosest(a)Thanks for reading code that I typed with fingers on keyboard. Yeah right, there's no self ownership in this totalitarian world, none of those things are mine, we're all slaves.