xyz_middle¶

Requirements:

mathematical operations
substrings and slicing
loop with a counter variable

Given a string, does "xyz" appear in the middle of the string? To define middle, we’ll say that the number of chars to the left and right of the "xyz" must differ by at most one. This problem is harder than it looks.

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:

'AAxyzBB'

Output:

True

Test 2¶

Input:

'AxyzBB'

Output:

True

Test 3¶

Input:

'AxyzBBB'

Output:

False

Test 4¶

Input:

'AxyzBBBB'

Output:

False

Test 5¶

Input:

'AAAxyzB'

Output:

False

Test 6¶

Input:

'AAAxyzBB'

Output:

True

Test 7¶

Input:

'AAAAxyzBB'

Output:

False

Test 8¶

Input:

'AAAAAxyzBBB'

Output:

False

Test 9¶

Input:

'1x345xyz12x4'

Output:

True

Test 10¶

Input:

'xyzAxyzBBB'

Output:

True

Test 11¶

Input:

'xyzAxyzBxyz'

Output:

True

Test 12¶

Input:

'xyzxyzAxyzBxyzxyz'

Output:

True

Test 13¶

Input:

'xyzxyzxyzBxyzxyz'

Output:

True

Test 14¶

Input:

'xyzxyzAxyzxyzxyz'

Output:

True

Test 15¶

Input:

'xyzxyzAxyzxyzxy'

Output:

False

Test 16¶

Input:

'AxyzxyzBB'

Output:

False

Test 17¶

Input:

''

Output:

False

Test 18¶

Input:

'x'

Output:

False

Test 19¶

Input:

'xy'

Output:

False

Test 20¶

Input:

'xyz'

Output:

True

Test 21¶

Input:

'xyzz'

Output:

True