zigzag_letters

Objective

Implement zigzag_letters, a text formatter that alternates letter casing.

Steps

Create zigzag_case.py.
Expose def zigzag_letters(text: str) -> str:.
Return a new string where alphabetic characters alternate between lowercase and uppercase.
The first alphabetic character must be lowercase, the second uppercase, the third lowercase, and so on.
Non-alphabetic characters must stay unchanged.
Non-alphabetic characters do not advance the alternating letter counter.
The alternation does not reset after spaces or punctuation.

examples

$ zigzag_letters("grade")

"gRaDe"

$ zigzag_letters("ab-cd ef")

"aB-cD eF"

Constraints

Expected files

zigzag_case.py

Allowed functions

None. Write every helper yourself.

Tests

Run the tests to grade your code

Build

01Plain word

02Spaces do not reset the alternating sequence

03Digits do not advance the letter counter

04Punctuation is preserved

05Empty string

06Alternation continues after spaces

07Symbols between letters

zigzag_letters

Objective

Implement zigzag_letters, a text formatter that alternates letter casing.

Steps

Create zigzag_case.py.
Expose def zigzag_letters(text: str) -> str:.
Return a new string where alphabetic characters alternate between lowercase and uppercase.
The first alphabetic character must be lowercase, the second uppercase, the third lowercase, and so on.
Non-alphabetic characters must stay unchanged.
Non-alphabetic characters do not advance the alternating letter counter.
The alternation does not reset after spaces or punctuation.

examples

$ zigzag_letters("grade")

"gRaDe"

$ zigzag_letters("ab-cd ef")

"aB-cD eF"

Constraints

Expected files

zigzag_case.py

Allowed functions

None. Write every helper yourself.

zigzag_letters

Objective

Implement zigzag_letters, a text formatter that alternates letter casing.

Steps

Create zigzag_case.py.
Expose def zigzag_letters(text: str) -> str:.
Return a new string where alphabetic characters alternate between lowercase and uppercase.
The first alphabetic character must be lowercase, the second uppercase, the third lowercase, and so on.
Non-alphabetic characters must stay unchanged.
Non-alphabetic characters do not advance the alternating letter counter.
The alternation does not reset after spaces or punctuation.

examples

$ zigzag_letters("grade")

"gRaDe"

$ zigzag_letters("ab-cd ef")

"aB-cD eF"

Constraints

Expected files

zigzag_case.py

Allowed functions

None. Write every helper yourself.

Tests

Run the tests to grade your code

Build

01Plain word

02Spaces do not reset the alternating sequence

03Digits do not advance the letter counter

04Punctuation is preserved

05Empty string

06Alternation continues after spaces

07Symbols between letters