Most Digits from List in Python

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def find_longest(xs):
    return max(xs, key=lambda x: len(str(x)))

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def find_longest(arr):
    arr.sort(reverse=True) 
    return arr[0]

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def find_longest(arr):
    max_lenght = 0
    max_index = 0
    for cur_num in arr:
        lenght = len(str(cur_num))
        if lenght > max_lenght:
            max_lenght = lenght
            max_index = arr.index(cur_num)
    return arr[max_index]

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import test
from solution import find_longest

@test.describe("Fixed Tests")
def fixed_tests():
    @test.it('Basic Test Cases')
    def basic_test_cases():
        test.assert_equals(find_longest([1, 10, 100]), 100)
        test.assert_equals(find_longest([9000, 8, 800]), 9000)
        test.assert_equals(find_longest([8, 900, 500]), 900)
        test.assert_equals(find_longest([3, 40000, 100]), 40000)
        test.assert_equals(find_longest([1, 200, 100000]), 100000)

@test.describe("Random tests")
def random_tests():
    
    from random import randint
    from functools import reduce
    
    sol=lambda arr: reduce(lambda a,b: b if len(str(a))<len(str(b)) else a,arr)
    
    for _ in range(40):
        arr=[randint(1,10**randint(1,20)) for q in range(randint(1,50))]
        expected = sol(arr)
        @test.it(f"Testing for find_longest({arr})")
        def _():
            test.assert_equals(find_longest(arr[:]),expected)