pre_4

Given a non-empty list of ints, return a new list containing the elements from the original list that come before the first 4 in the original list. The original list will contain at least one 4. Note that it is valid in java to create a list of length 0.

pre_4([1, 2, 4, 1]) -> [1, 2]
pre_4([3, 1, 4]) -> [3, 1]
pre_4([1, 4, 4]) -> [1]

This exercise was taken from codingbat.com and has been adapted for the Python language. There are many great programming exercises there, but the majority are created for Java.

Starter Code

from typing import List


def pre_4(nums: List[int]) -> List[int]:
    pass


result = pre_4([1, 2, 4, 1])
print(result)

Tests

from main import pre_4


def test_pre_4_1():
    assert pre_4([1, 2, 4, 1]) == [1, 2]


def test_pre_4_2():
    assert pre_4([3, 1, 4]) == [3, 1]


def test_pre_4_3():
    assert pre_4([1, 4, 4]) == [1]


def test_pre_4_4():
    assert pre_4([1, 4, 4, 2]) == [1]


def test_pre_4_5():
    assert pre_4([1, 3, 4, 2, 4]) == [1, 3]


def test_pre_4_6():
    assert pre_4([4, 4]) == []


def test_pre_4_7():
    assert pre_4([3, 3, 4]) == [3, 3]


def test_pre_4_8():
    assert pre_4([1, 2, 1, 4]) == [1, 2, 1]


def test_pre_4_9():
    assert pre_4([2, 1, 4, 2]) == [2, 1]


def test_pre_4_10():
    assert pre_4([2, 1, 2, 1, 4, 2]) == [2, 1, 2, 1]