def is_color(c):
"""
Checks whether a value represents a color.
As with Turtles, colors may be colormodel objects or strings. They may also be
sequences of 3 or 4 elements. In the case of the latter, the elements of the
sequence must all be in the range 0..1.
:return: True if c represents a color
:rtype: ``bool``
:param c: The value to test
:type c: any
"""
import introcs
if type(c) in [introcs.RGB, introcs.HSV]:
return True
if type(c) in [tuple, list] and 3 <= len(c) <= 4:
from functools import reduce
#print(reduce(lambda x, y: x and y, map(lambda z: type(z) in [int, float] and 0 <= z <= 1, c)))
return reduce(
lambda x, y: x and y,
map(lambda z: type(z) in [int, float] and 0 <= z <= 1, c))
return type(c) == str and (introcs.is_tkcolor(c) or introcs.is_webcolor(c))
def is_valid_color(c):
"""
Returns: True c is a valid turtle color; False otherwise
Parameter c: the value to check
Precondition: NONE (c can be any value)
"""
return (type(c) == introcs.RGB or type(c) == introcs.HSV or
(type(c) == str and (introcs.is_tkcolor(c) or \
introcs.is_webcolor(c))))