is_everywhere¶

We’ll say that a value is “everywhere” in a list if for every pair of adjacent elements in the list, at least one of the pair is that value. Return true if the given value is everywhere in the list.

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, 1, 3]
1

Output:

True

Test 2¶

Input:

[1, 2, 1, 3]
2

Output:

False

Test 3¶

Input:

[1, 2, 1, 3, 4]
1

Output:

False

Test 4¶

Input:

[2, 1, 2, 1]
1

Output:

True

Test 5¶

Input:

[2, 1, 2, 1]
2

Output:

True

Test 6¶

Input:

[2, 1, 2, 3, 1]
2

Output:

False

Test 7¶

Input:

[3, 1]
3

Output:

True

Test 8¶

Input:

[3, 1]
2

Output:

False

Test 9¶

Input:

[3]
1

Output:

True

Test 10¶

Input:

[]
1

Output:

True

Test 11¶

Input:

[1, 2, 1, 2, 3, 2, 5]
2

Output:

True

Test 12¶

Input:

[1, 2, 1, 1, 1, 2]
2

Output:

False

Test 13¶

Input:

[2, 1, 2, 1, 1, 2]
2

Output:

False

Test 14¶

Input:

[2, 1, 2, 2, 2, 1, 1, 2]
2

Output:

False

Test 15¶

Input:

[2, 1, 2, 2, 2, 1, 2, 1]
2

Output:

True

Test 16¶

Input:

[2, 1, 2, 1, 2]
2

Output:

True