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¶

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)¶

Bases: builtins.list

List with a clear() method.

Warning

Usage of the iterate() function will decrease your performance.

clear()¶: Remove all items from list.

kivy.utils.boundary(value, minvalue, maxvalue)¶: Limit a value between a minvalue and maxvalue.

kivy.utils.deprecated(func=None, msg='')¶: 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.difference(set1, set2)¶: Return the difference between 2 lists.

kivy.utils.escape_markup(text)¶

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)¶

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_color_from_hex(s)¶: Transform a hex string color to a kivy Color.

kivy.utils.get_hex_from_color(color)¶

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)¶

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)¶: 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.intersection(set1, set2)¶: Return the intersection of 2 lists.

kivy.utils.is_color_transparent(c)¶: Return True if the alpha channel is 0.

class kivy.utils.reify(func)¶

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)¶: 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)¶

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)

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Utils¶