Mercurial > cpython-lru_cache-weakref

annotate Demo/classes/Vec.py @ 54294:dba767bc3155 legacy-trunk

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remove mention of old ctypes version
author Benjamin Peterson <benjamin@python.org>
date Sat, 23 May 2009 20:59:09 +0000
parents b8737a31050c
children 7d16b42fcdbd 3355356f1c74
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1 # A simple vector class
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3
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4 def vec(*v):
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5 return Vec(*v)
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7
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8 class Vec:
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9
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10 def __init__(self, *v):
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11 self.v = list(v)
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12
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13 def fromlist(self, v):
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14 if not isinstance(v, list):
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15 raise TypeError
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16 self.v = v[:]
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17 return self
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19 def __repr__(self):
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20 return 'vec(' + repr(self.v)[1:-1] + ')'
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21
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22 def __len__(self):
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23 return len(self.v)
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25 def __getitem__(self, i):
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26 return self.v[i]
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28 def __add__(self, other):
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29 # Element-wise addition
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30 v = map(lambda x, y: x+y, self, other)
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31 return Vec().fromlist(v)
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32
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33 def __sub__(self, other):
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34 # Element-wise subtraction
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35 v = map(lambda x, y: x-y, self, other)
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36 return Vec().fromlist(v)
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38 def __mul__(self, scalar):
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39 # Multiply by scalar
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40 v = map(lambda x: x*scalar, self.v)
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41 return Vec().fromlist(v)
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45 def test():
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46 a = vec(1, 2, 3)
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47 b = vec(3, 2, 1)
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48 print a
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49 print b
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50 print a+b
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51 print a-b
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52 print a*3.0
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54 test()