PracticeStrings

Validate a Battle Score Display

Easy/MediumStringstraversalstate trackingcomparison Time not estimated Not started

Context

A game stores score displays as text before showing them on a level board. Accept only nonnegative decimal score text: a nonempty run of digits, optionally followed by a decimal point and one or two digits. Reject signs, spaces, missing integer digits, missing fractional digits, extra separators, and excessive precision.

Problem

Write a function that decides whether score_text follows the game’s score-display format exactly. The text must contain one or more digits for the whole-number portion. It may stop there, or continue with one decimal point followed by exactly one or two digits. No other characters are allowed, and the entire string must conform. Do not convert the text to a numeric value; validate its characters and structure. Return true only for an accepted score display and false otherwise.

Examples

Example 1

Input: score_text = "7"

Output: True

Explanation: The input "7" returns true, and its final traced state has position 1, text length 1, match state 1, and validity_flag true.

Example 2

Input: score_text = "42.5"

Output: True

Explanation: The input "42.5" returns true, and its final traced state has position 4, text length 4, match state 3, and validity_flag true.

Example 3

Input: score_text = "103.25"

Output: True

Explanation: The input "103.25" returns true, and its final traced state has position 6, text length 6, match state 4, and validity_flag true.

Constraints

1 <= len(score_text) <= 40
score_text uses digits only for its numeric portions and may also contain one optional decimal point.
Types: score_text is str; result is bool

Function signature

def is_valid_score_display(score_text: str) -> bool

score_text str: The score display text to validate.
returns bool: True exactly when the complete text is an unsigned decimal score with an optional one- or two-digit fractional part; otherwise false.

Adapted from MBPP problem task_759 (CC BY 4.0). Rewritten, extended and verified by Iksha.

Notes

Validation must preserve the original text and must not rely on numeric conversion.
The decimal point is permitted only between a nonempty integer portion and a nonempty fractional portion.

Code

Saved

Checking environment…Python SandboxLn 1, Col 1

score_text =