yapp-prompt 0.1.1

YAPP (Yet Another Prompt Package) is a lightweight Python library that provides a robust, typed, and configurable way to handle interactive user input.

🧩 YAPP — Yet Another Prompt Package

YAPP is a lightweight Python library that provides a robust, typed, and configurable way to handle interactive user input.

It provides a unique prompt function capable of handling:

• default value
• custom validation
• type conversion (cast)
• predefined choices
• attempt limit management
• masked input (e.g., passwords, tokens, etc.) [secret]
• advanced typing via typing.overload

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🚀 Installation

pip install yapp-prompt

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✨ Features

• ✅ Default value management
• ✅ Support for nullable inputs
• ✅ Custom validation
• ✅ Automatic type conversion
• ✅ Support for user selections
• ✅ Secure input (getpass)
• ✅ Limit on the number of attempts
• ✅ Explicit typing with typing.overload

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📦 Base usage

from yapp_prompt import prompt
name = prompt("What is your name?")
print(name)

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🎯 Default value

age = prompt("Your age", default=18, cast=int)
print(age, type(age))

👉 If the user presses Enter, 18 will be returned.

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🔁 Nullable

value = prompt("Optional value", nullable=True)

👉 Return None if the user presses Enter.

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🔒 Hidden input (passwords, tokens, etc.)

password = prompt("Password", secret=True)

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🔢 Type conversion (cast)

age = prompt("Your age", cast=int)

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✔️ Custom validation

def is_valid(value: str) -> bool:
    return value.isdigit()

age = prompt("Age", verification=is_valid, cast=int)

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📋 Preset options

def verify(choices, value):
    return value in choices

color = prompt(
    "Choose a color",
    choices=["red", "blue", "green"],
    verification=verify
)

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🎨 Custom formatter

def formatter(choices):
    return "\nAvailable: " + ", ".join(choices)

color = prompt(
    "Color",
    choices=["red", "blue"],
    formatter=formatter
)

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🔁 Number of attempts

value = prompt("Enter value", max_attempt=3)

Infinite mode

value = prompt("Enter value", max_attempt="infinite")

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⚙️ Paramètres

Parameters	Type	Description	Special value
message	str	Message displayed
choices	Choices | None	List of option
default	T | None	Default value
nullable	bool	Allows None
formatter	Callable	Format of the options
verification	Callable	Validation function
cast	Callable	Type conversion
secret	bool	Masque la saisie
max_attempt	int	Max number of attempts	"infinite"
console	rich.console.Console	Console used

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🧠 Advanced typing

YAPP uses typing.overload to provide accurate typing based on:

• default
• nullable
• max_attempt 👉 Example :

value: int = prompt("Number", cast=int, default=0)

value: int | None = prompt("Number", cast=int, nullable=True)

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⚠️ Important information

Empty value ("")

• If default exist -> return default
• Else if nullable=True -> return None
• Else -> requests another seizure until attempt maximum attempt.

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🐞 Error Handling

• If verification fails -> try again
• If cast fails -> try again
• If max_attempts is reaching -> return default if exist else None

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🧪 Tests

Use pytest with monkeypatch to mock input :

pytest -v

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⚠️ Dependencies

• rich for console output

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💡 Use cases

• Interactive CLIs
• Automation scripts
• Command-line tools

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📄 License

MIT

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👨‍💻 Auteur

BonjourBenjamin