Compare Values in a List and create Boolean Python

Question

I have a program in which I'm supposed to create a list of 5 numbers and then compare these items to see if they are all the same. I am supposed to compare the numbers of the list and then return a Boolean if it is true or not. (I'm relatively new to programming and am only allowed to use the random Library and the regular library). If anyone could point me in the right direction, I'd really appreciate it.

I've tried things such as

if aList[0] = aList[1] and aList [2] and... aList[4]: 
   Return = True.

Thanks!

Martijn Pieters · Accepted Answer · 2014-02-24 22:20:34Z

5

Use a set():

def all_the_same(lst):
    # all values in aList are the same.
    return len(set(lst)) == 1

This works for any list of hashable values; strings, integers, booleans, tuples with hashable contents, floats (if they are exactly the same), etc.

answered Feb 24, 2014 at 22:20

Martijn Pieters

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Comments

Hugh Bothwell · Accepted Answer · 2014-02-24 22:22:48Z

1

return all(aList[0] == aList[i] for i in range(1, len(aList))

answered Feb 24, 2014 at 22:22

Hugh Bothwell

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Comments

SingleNegationElimination · Accepted Answer · 2014-02-24 22:23:31Z

-1

Here's a python3 variation that has short circuit behavior:

ix = iter(aList)
iy = iter(aList)
next(iy)
if all(x == y for x, y in zip(ix, iy)):
    do something

answered Feb 24, 2014 at 22:23

SingleNegationElimination

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2 Comments

dckuehn Over a year ago

Not allowed to use outside libraries other than random

SingleNegationElimination Over a year ago

Note, in python 2, zip is eager (returns a list) instead of lazy; you can get the iterator version of zip as itertools.izip in the python standard library.

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