prefix_again¶

Requirements:

mathematical operations
substrings and slicing
loop with a counter variable
if, else
break

Get a string and a prefix length n from the user. Does a prefix of size n appear somewhere else in the string? Output True if it does, and False if not. Assume that string is not empty and that n is in the range 1..len(string).

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:

'abXYabc'
1

Output:

True

Test 2¶

Input:

'abXYabc'
2

Output:

True

Test 3¶

Input:

'abXYabc'
3

Output:

False

Test 4¶

Input:

'xyzxyxyxy'
2

Output:

True

Test 5¶

Input:

'xyzxyxyxy'
3

Output:

False

Test 6¶

Input:

'Hi12345Hi6789Hi10'
1

Output:

True

Test 7¶

Input:

'Hi12345Hi6789Hi10'
2

Output:

True

Test 8¶

Input:

'Hi12345Hi6789Hi10'
3

Output:

True

Test 9¶

Input:

'Hi12345Hi6789Hi10'
4

Output:

False

Test 10¶

Input:

'a'
1

Output:

False

Test 11¶

Input:

'aa'
1

Output:

True

Test 12¶

Input:

'ab'
1

Output:

False