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annotate Demo/classes/Vec.py @ 79675:c0a2294de787 2.7

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Issue #16199: Backport 2to3 typo fix from 3.2.
author Chris Jerdonek <chris.jerdonek@gmail.com>
date Thu, 11 Oct 2012 16:15:46 -0700
parents 3355356f1c74
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 class Vec:
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2 """ A simple vector class
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3
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4 Instances of the Vec class can be constructed from numbers
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6 >>> a = Vec(1, 2, 3)
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7 >>> b = Vec(3, 2, 1)
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8
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9 added
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10 >>> a + b
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11 Vec(4, 4, 4)
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13 subtracted
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14 >>> a - b
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15 Vec(-2, 0, 2)
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16
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17 and multiplied by a scalar on the left
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18 >>> 3.0 * a
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19 Vec(3.0, 6.0, 9.0)
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20
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21 or on the right
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22 >>> a * 3.0
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23 Vec(3.0, 6.0, 9.0)
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24 """
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25 def __init__(self, *v):
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26 self.v = list(v)
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28 @classmethod
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29 def fromlist(cls, v):
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30 if not isinstance(v, list):
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31 raise TypeError
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32 inst = cls()
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33 inst.v = v
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34 return inst
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36 def __repr__(self):
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37 args = ', '.join(repr(x) for x in self.v)
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38 return 'Vec({0})'.format(args)
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40 def __len__(self):
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41 return len(self.v)
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42
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43 def __getitem__(self, i):
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44 return self.v[i]
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46 def __add__(self, other):
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47 # Element-wise addition
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48 v = [x + y for x, y in zip(self.v, other.v)]
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49 return Vec.fromlist(v)
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51 def __sub__(self, other):
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52 # Element-wise subtraction
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53 v = [x - y for x, y in zip(self.v, other.v)]
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54 return Vec.fromlist(v)
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56 def __mul__(self, scalar):
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57 # Multiply by scalar
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58 v = [x * scalar for x in self.v]
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59 return Vec.fromlist(v)
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61 __rmul__ = __mul__
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64 def test():
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65 import doctest
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66 doctest.testmod()
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68 test()