#51BeginnerVariables & Types· Built-in Types

Data Types Explorer

Everything a user types reaches your program as a string, even when it looks like a number. Before converting it, a program has to decide which Python type the text describes. Write `detect_types(values)` that returns, for each string in `values`, the name of the type it describes. First remove surrounding spaces, then apply the first rule that matches: 1. `True` or `False` (exact spelling) → `"bool"` 2. `None` → `"NoneType"` 3. an optional `+` or `-` followed by one or more digits → `"int"` 4. an optional `+` or `-` followed by digits that contain exactly one `.` and at least one digit (`3.14`, `.5`, `7.`) → `"float"` 5. anything else, including the empty string → `"str"` Spellings such as `true`, `1_000` or `1e3` count as `"str"` here.

Input format

`values`: a list of strings.

Output format

A list of type names, one per input string, in the same order.

Examples

Input: values = ["42","3.14","True","None","hello"]

Output: ["int","float","bool","NoneType","str"]

One value of each kind.

Input: values = [" -7 ","+.5","true",""]

Output: ["int","float","str","str"]

Spaces are removed first. Lower-case `true` is not a bool literal, and an empty string stays a string.

Constraints

0 <= len(values) <= 100
Each string has at most 30 characters

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Variables and Data Types in Python

#python
#data-types
#type-conversion
#strings