only_14¶

Given a list of ints, return true if every element is a 1 or a 4.

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.

Test 1¶

Input:

[1, 4, 1, 4]

Output:

True

Test 2¶

Input:

[1, 4, 2, 4]

Output:

False

Test 3¶

Input:

[1, 1]

Output:

True

Test 4¶

Input:

[4, 1]

Output:

True

Test 5¶

Input:

[2]

Output:

False

Test 6¶

Input:

[]

Output:

True

Test 7¶

Input:

[1, 4, 1, 3]

Output:

False

Test 8¶

Input:

[3, 1, 3]

Output:

False

Test 9¶

Input:

[1]

Output:

True

Test 10¶

Input:

[4]

Output:

True

Test 11¶

Input:

[3, 4]

Output:

False

Test 12¶

Input:

[1, 3, 4]

Output:

False

Test 13¶

Input:

[1, 1, 1]

Output:

True

Test 14¶

Input:

[1, 1, 1, 5]

Output:

False

Test 15¶

Input:

[4, 1, 4, 1]

Output:

True