no_14¶

Given a list of ints, return true if it contains no 1’s or it contains no 4’s.

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, 2, 3]

Output:

True

Test 2¶

Input:

[1, 2, 3, 4]

Output:

False

Test 3¶

Input:

[2, 3, 4]

Output:

True

Test 4¶

Input:

[1, 1, 4, 4]

Output:

False

Test 5¶

Input:

[2, 2, 4, 4]

Output:

True

Test 6¶

Input:

[2, 3, 4, 1]

Output:

False

Test 7¶

Input:

[2, 1, 1]

Output:

True

Test 8¶

Input:

[1, 4]

Output:

False

Test 9¶

Input:

[2]

Output:

True

Test 10¶

Input:

[2, 1]

Output:

True

Test 11¶

Input:

[1]

Output:

True

Test 12¶

Input:

[4]

Output:

True

Test 13¶

Input:

[]

Output:

True

Test 14¶

Input:

[1, 1, 1, 1]

Output:

True

Test 15¶

Input:

[9, 4, 4, 1]

Output:

False

Test 16¶

Input:

[4, 2, 3, 1]

Output:

False

Test 17¶

Input:

[4, 2, 3, 5]

Output:

True

Test 18¶

Input:

[4, 4, 2]

Output:

True

Test 19¶

Input:

[1, 4, 4]

Output:

False