O.rka O.rka - 7 months ago 15
Python Question

Check if all values in list are greater than a certain number

my_list1 = [30,34,56]
my_list2 = [29,500,43]


How to I check if all values in list are >= 30?
my_list1
should work and
my_list2
should not.

The only thing I could think of doing was:

boolean = 0
def func(ls):
for k in ls:
if k >= 30:
boolean = boolean + 1
else:
boolean = 0
if boolean > 0:
print 'Continue'
elif boolean = 0:
pass


Update 2016:



In hindsight, after dealing with bigger datasets where speed actually matters and utilizing
numpy
...I would do this:

>>> my_list1 = [30,34,56]
>>> my_list2 = [29,500,43]

>>> import numpy as np
>>> A_1 = np.array(my_list1)
>>> A_2 = np.array(my_list2)

>>> A_1 >= 30
array([ True, True, True], dtype=bool)
>>> A_2 >= 30
array([False, True, True], dtype=bool)

>>> ((A_1 >= 30).sum() == A_1.size).astype(np.int)
1
>>> ((A_2 >= 30).sum() == A_2.size).astype(np.int)
0

Answer

Use the all() function with a generator expression:

>>> my_list1 = [30, 34, 56]
>>> my_list2 = [29, 500, 43]
>>> all(i >= 30 for i in my_list1)
True
>>> all(i >= 30 for i in my_list2)
False

Note that this tests for greater than or equal to 30, otherwise my_list1 would not pass the test either.

If you wanted to do this in a function, you'd use:

def all_30_or_up(ls):
    for i in ls:
        if i < 30:
            return False
    return True

e.g. as soon as you find a value that proves that there is a value below 30, you return False, and return True if you found no evidence to the contrary.