Table Of Contents
Utils¶
The Utils module provides a selection of general utility functions and classes that may be useful for various applications. These include maths, color, algebraic and platform functions.
Changed in version 1.6.0: The OrderedDict class has been removed. Use collections.OrderedDict instead.
- class kivy.utils.QueryDict[source]¶
Bases:
builtins.dict
QueryDict is a dict() that can be queried with dot.
d = QueryDict() # create a key named toto, with the value 1 d.toto = 1 # it's the same as d['toto'] = 1
New in version 1.0.4.
- class kivy.utils.SafeList(*args, **kwargs)[source]¶
Bases:
builtins.list
List with a clear() method.
Warning
Usage of the iterate() function will decrease your performance.
- kivy.utils.boundary(value, minvalue, maxvalue)[source]¶
Limit a value between a minvalue and maxvalue.
- kivy.utils.deprecated(func=None, msg='')[source]¶
This is a decorator which can be used to mark functions as deprecated. It will result in a warning being emitted the first time the function is used.
- kivy.utils.escape_markup(text)[source]¶
Escape markup characters found in the text. Intended to be used when markup text is activated on the Label:
untrusted_text = escape_markup('Look at the example [1]') text = '[color=ff0000]' + untrusted_text + '[/color]' w = Label(text=text, markup=True)
New in version 1.3.0.
- kivy.utils.format_bytes_to_human(size, precision=2)[source]¶
Format a byte value to a human readable representation (B, KB, MB…).
New in version 1.0.8.
- Parameters:
- size: int
Number that represents the bytes value
- precision: int, defaults to 2
Precision after the comma
Examples:
>>> format_bytes_to_human(6463) '6.31 KB' >>> format_bytes_to_human(646368746541) '601.98 GB'
- kivy.utils.get_hex_from_color(color)[source]¶
Transform a kivy
Color
to a hex value:>>> get_hex_from_color((0, 1, 0)) '#00ff00' >>> get_hex_from_color((.25, .77, .90, .5)) '#3fc4e57f'
New in version 1.5.0.
- kivy.utils.get_random_color(alpha=1.0)[source]¶
Returns a random color (4 tuple).
- Parameters:
- alpha: float, defaults to 1.0
If alpha == ‘random’, a random alpha value is generated.
- kivy.utils.interpolate(value_from, value_to, step=10)[source]¶
Interpolate between two values, by providing the reciprocal of the proportion between two points.
Deprecated since version 2.3.0: For animations, consider using the AnimationTransition.linear() for a similar purpose.
Warning
These interpolations work only on lists/tuples/doubles with the same dimensions. No test is done to check the dimensions are the same.
- kivy.utils.platform = 'linux'¶
A string identifying the current operating system. It is one of: ‘win’, ‘linux’, ‘android’, ‘macosx’, ‘ios’ or ‘unknown’. You can use it as follows:
from kivy.utils import platform if platform == 'linux': do_linux_things()
New in version 1.3.0.
Changed in version 1.8.0: platform is now a variable instead of a function.
- class kivy.utils.reify(func)[source]¶
Bases:
builtins.object
Put the result of a method which uses this (non-data) descriptor decorator in the instance dict after the first call, effectively replacing the decorator with an instance variable.
It acts like @property, except that the function is only ever called once; after that, the value is cached as a regular attribute. This gives you lazy attribute creation on objects that are meant to be immutable.
Taken from the Pyramid project.
To use this as a decorator:
@reify def lazy(self): ... return hard_to_compute_int first_time = self.lazy # lazy is reify obj, reify.__get__() runs second_time = self.lazy # lazy is hard_to_compute_int
- kivy.utils.rgba(s, *args)[source]¶
Return a Kivy color (4 value from 0-1 range) from either a hex string or a list of 0-255 values.
New in version 1.10.0.
- kivy.utils.strtotuple(s)[source]¶
Convert a tuple string into a tuple with some security checks. Designed to be used with the eval() function:
a = (12, 54, 68) b = str(a) # return '(12, 54, 68)' c = strtotuple(b) # return (12, 54, 68)