MiheiSV

import random
import numpy as np

RANGE = 1000
data = np.ones(RANGE)
data[random.randint(0, RANGE)] = random.choice([1, 42])
data = list(data)

def check_ones1():
    result = True
    for im in data:
        if im != 1:
            result = False
            break
    return result

def check_ones2():
    return all(map(lambda x:x==1, data))

def check_ones3():
    return data.count(1) == len(data)

assert check_ones1() == check_ones2() == check_ones3()

print(check_ones1())

# False

%timeit check_ones1()
69.6 µs ± 779 ns per loop (mean ± std. dev. of 7 runs, 10,000 loops each)
%timeit check_ones2()
94 µs ± 936 ns per loop (mean ± std. dev. of 7 runs, 10,000 loops each)
%timeit check_ones3()
87.7 µs ± 633 ns per loop (mean ± std. dev. of 7 runs, 10,000 loops each)

# True

%timeit check_ones1()
93.5 µs ± 776 ns per loop (mean ± std. dev. of 7 runs, 10,000 loops each)
%timeit check_ones2()
124 µs ± 374 ns per loop (mean ± std. dev. of 7 runs, 10,000 loops each)
%timeit check_ones3()
86.9 µs ± 566 ns per loop (mean ± std. dev. of 7 runs, 10,000 loops each)

arr = [....]
sorted(arr)
if arr[0] == 1 and arr[-1] == 1:
    ...

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