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vector2d examples updated after chapter 9 split

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This commit is contained in:
Luciano Ramalho
2014-10-20 09:30:33 -02:00
parent 9da839023e
commit 812d416c15
6 changed files with 94 additions and 98 deletions
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40
classes/vector2d_v3_slots.py
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@@ -2,26 +2,28 @@
A 2-dimensional vector class
>>> v1 = Vector2d(3, 4)
>>> x, y = v1 #<1>
>>> print(v1.x, v1.y)
3.0 4.0
>>> x, y = v1
>>> x, y
(3.0, 4.0)
>>> v1 #<2>
>>> v1
Vector2d(3.0, 4.0)
>>> v1_clone = eval(repr(v1)) #<3>
>>> v1_clone = eval(repr(v1))
>>> v1 == v1_clone
True
>>> print(v1) #<4>
>>> print(v1)
(3.0, 4.0)
>>> octets = bytes(v1) #<5>
>>> octets = bytes(v1)
>>> octets
b'\\x00\\x00\\x00\\x00\\x00\\x00\\x08@\\x00\\x00\\x00\\x00\\x00\\x00\\x10@'
>>> abs(v1) #<6>
b'd\\x00\\x00\\x00\\x00\\x00\\x00\\x08@\\x00\\x00\\x00\\x00\\x00\\x00\\x10@'
>>> abs(v1)
5.0
>>> bool(v1), bool(Vector2d(0, 0)) #<7>
>>> bool(v1), bool(Vector2d(0, 0))
(True, False)
Test of .frombytes() class method:
Test of ``.frombytes()`` class method:
>>> v1_clone = Vector2d.frombytes(bytes(v1))
>>> v1_clone
@@ -62,8 +64,8 @@ Tests of ``format()`` with polar coordinates:
>>> format(Vector2d(1, 1), '0.5fp')
'<1.41421, 0.78540>'
# BEGIN VECTOR2D_V3_DEMO
Test of `x` and `y` read-only properties:
Tests of `x` and `y` read-only properties:
>>> v1.x, v1.y
(3.0, 4.0)
@@ -72,9 +74,7 @@ Test of `x` and `y` read-only properties:
...
AttributeError: can't set attribute
# END VECTOR2D_V3_HASH_DEMO
# BEGIN VECTOR2D_V3_HASH_DEMO
Tests of hashing:
>>> v1 = Vector2d(3, 4)
>>> v2 = Vector2d(3.1, 4.2)
@@ -85,7 +85,6 @@ Test of `x` and `y` read-only properties:
# END VECTOR2D_V3_DEMO
"""
from array import array
@@ -116,21 +115,21 @@ class Vector2d:
return (i for i in (self.x, self.y))
def __repr__(self):
return 'Vector2d({!r}, {!r})'.format(*self)
class_name = type(self).__name__
return '{}({!r}, {!r})'.format(class_name, *self)
def __str__(self):
return str(tuple(self))
def __bytes__(self):
return bytes(array(Vector2d.typecode, self))
return (bytes([ord(self.typecode)]) +
bytes(array(self.typecode, self)))
def __eq__(self, other):
return tuple(self) == tuple(other)
# BEGIN VECTOR2D_V3_HASH
def __hash__(self):
return hash(self.x) ^ hash(self.y)
# END VECTOR2D_V3_HASH
def __abs__(self):
return math.hypot(self.x, self.y)
@@ -154,5 +153,6 @@ class Vector2d:
@classmethod
def frombytes(cls, octets):
memv = memoryview(octets).cast(cls.typecode)
typecode = chr(octets[0])
memv = memoryview(octets[1:]).cast(typecode)
return cls(*memv)