Preferences

class wpilib.Preferences

Bases: pybind11_object

The preferences class provides a relatively simple way to save important values to the roboRIO to access the next time the roboRIO is booted.

This class loads and saves from a file inside the roboRIO. The user cannot access the file directly, but may modify values at specific fields which will then be automatically periodically saved to the file by the NetworkTable server.

This class is thread safe.

This will also interact with NetworkTable by creating a table called “Preferences” with all the key-value pairs.

static containsKey(key: str) → bool

Returns whether or not there is a key with the given name.

Parameters:

key – the key

Returns:

if there is a value at the given key

static getBoolean(key: str, defaultValue: bool = False) → bool

Returns the boolean at the given key. If this table does not have a value for that position, then the given defaultValue value will be returned.

Parameters:

  • key – the key

  • defaultValue – the value to return if none exists in the table

Returns:

either the value in the table, or the defaultValue

static getDouble(key: str, defaultValue: float = 0.0) → float

Returns the double at the given key. If this table does not have a value for that position, then the given defaultValue value will be returned.

Parameters:

  • key – the key

  • defaultValue – the value to return if none exists in the table

Returns:

either the value in the table, or the defaultValue

static getFloat(key: str, defaultValue: float = 0.0) → float

Returns the float at the given key. If this table does not have a value for that position, then the given defaultValue value will be returned.

Parameters:

  • key – the key

  • defaultValue – the value to return if none exists in the table

Returns:

either the value in the table, or the defaultValue

static getInt(key: str, defaultValue: int = 0) → int

Returns the int at the given key. If this table does not have a value for that position, then the given defaultValue value will be returned.

Parameters:

  • key – the key

  • defaultValue – the value to return if none exists in the table

Returns:

either the value in the table, or the defaultValue

static getKeys() → List[str]

Returns a vector of all the keys.

Returns:

a vector of the keys

static getLong(key: str, defaultValue: int = 0) → int

Returns the long (int64_t) at the given key. If this table does not have a value for that position, then the given defaultValue value will be returned.

Parameters:

  • key – the key

  • defaultValue – the value to return if none exists in the table

Returns:

either the value in the table, or the defaultValue

static getString(key: str, defaultValue: str = '') → str

Returns the string at the given key. If this table does not have a value for that position, then the given defaultValue will be returned.

Parameters:

  • key – the key

  • defaultValue – the value to return if none exists in the table

Returns:

either the value in the table, or the defaultValue

static initBoolean(key: str, value: bool) → None

Puts the given boolean into the preferences table if it doesn’t already exist.

static initDouble(key: str, value: float) → None

Puts the given double into the preferences table if it doesn’t already exist.

static initFloat(key: str, value: float) → None

Puts the given float into the preferences table if it doesn’t already exist.

static initInt(key: str, value: int) → None

Puts the given int into the preferences table if it doesn’t already exist.

static initLong(key: str, value: int) → None

Puts the given long into the preferences table if it doesn’t already exist.

static initString(key: str, value: str) → None

Puts the given string into the preferences table if it doesn’t already exist.

static remove(key: str) → None

Remove a preference.

Parameters:

key – the key

static removeAll() → None

Remove all preferences.

static setBoolean(key: str, value: bool) → None

Puts the given boolean into the preferences table.

The key may not have any whitespace nor an equals sign.

Parameters:

  • key – the key

  • value – the value

static setDouble(key: str, value: float) → None

Puts the given double into the preferences table.

The key may not have any whitespace nor an equals sign.

Parameters:

  • key – the key

  • value – the value

static setFloat(key: str, value: float) → None

Puts the given float into the preferences table.

The key may not have any whitespace nor an equals sign.

Parameters:

  • key – the key

  • value – the value

static setInt(key: str, value: int) → None

Puts the given int into the preferences table.

The key may not have any whitespace nor an equals sign.

Parameters:

  • key – the key

  • value – the value

static setLong(key: str, value: int) → None

Puts the given long (int64_t) into the preferences table.

The key may not have any whitespace nor an equals sign.

Parameters:

  • key – the key

  • value – the value

static setString(key: str, value: str) → None

Puts the given string into the preferences table.

The value may not have quotation marks, nor may the key have any whitespace nor an equals sign.

Parameters:

  • key – the key

  • value – the value