xyz_there¶

Requirements:

substrings and slicing
if, else
loop through a string (while)

Output True if the given string contains an appearance of "xyz" where the xyz is not directly preceeded by a period (.). So "xxyz" counts but "x.xyz" does not.

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:

'abcxyz'

Output:

True

Test 2¶

Input:

'abc.xyz'

Output:

False

Test 3¶

Input:

'xyz.abc'

Output:

True

Test 4¶

Input:

'abcxy'

Output:

False

Test 5¶

Input:

'xyz'

Output:

True

Test 6¶

Input:

'xy'

Output:

False

Test 7¶

Input:

'x'

Output:

False

Test 8¶

Input:

''

Output:

False

Test 9¶

Input:

'abc.xyzxyz'

Output:

True

Test 10¶

Input:

'abc.xxyz'

Output:

True

Test 11¶

Input:

'.xyz'

Output:

False

Test 12¶

Input:

'12.xyz'

Output:

False

Test 13¶

Input:

'12xyz'

Output:

True

Test 14¶

Input:

'1.xyz.xyz2.xyz'

Output:

False