Vermillion Vermillion - 1 month ago 8
Python Question

Test for consecutive numbers in list

I have a list that contains only integers, and I want to check if all the numbers in the list are consecutive (the order of the numbers does not matter).

If there are repeated elements, the function should return False.

Here is my attempt to solve this:

def isconsecutive(lst):
"""
Returns True if all numbers in lst can be ordered consecutively, and False otherwise
"""
if len(set(lst)) == len(lst) and max(lst) - min(lst) == len(lst) - 1:
return True
else:
return False


For example:

l = [-2,-3,-1,0,1,3,2,5,4]

print(isconsecutive(l))

True


Is this the best way to do this?

Answer

Here is another solution:

def is_consecutive(l):
    setl = set(l)
    return len(l) == len(setl) and setl == set(range(min(l), max(l)+1))

However, your solution is probably better as you don't store the whole range in memory.

Note that you can always simplify

if boolean_expression:
    return True
else:
    return False

by

return boolean_expression
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