mirror of https://github.com/python/cpython.git
65 lines
935 B
Python
Executable File
65 lines
935 B
Python
Executable File
# A simple vector class
|
|
|
|
|
|
def vec(*v):
|
|
return apply(Vec, v)
|
|
|
|
|
|
class Vec:
|
|
|
|
def __init__(self, *v):
|
|
self.v = []
|
|
for x in v:
|
|
self.v.append(x)
|
|
|
|
|
|
def fromlist(self, v):
|
|
self.v = []
|
|
if type(v) <> type([]):
|
|
raise TypeError
|
|
self.v = v[:]
|
|
return self
|
|
|
|
|
|
def __repr__(self):
|
|
return 'vec(' + `self.v`[1:-1] + ')'
|
|
|
|
def __len__(self):
|
|
return len(self.v)
|
|
|
|
def __getitem__(self, i):
|
|
return self.v[i]
|
|
|
|
def __add__(a, b):
|
|
# Element-wise addition
|
|
v = []
|
|
for i in range(len(a)):
|
|
v.append(a[i] + b[i])
|
|
return Vec().fromlist(v)
|
|
|
|
def __sub__(a, b):
|
|
# Element-wise subtraction
|
|
v = []
|
|
for i in range(len(a)):
|
|
v.append(a[i] - b[i])
|
|
return Vec().fromlist(v)
|
|
|
|
def __mul__(self, scalar):
|
|
# Multiply by scalar
|
|
v = []
|
|
for i in range(len(self.v)):
|
|
v.append(self.v[i]*scalar)
|
|
return Vec().fromlist(v)
|
|
|
|
|
|
|
|
def test():
|
|
a = vec(1, 2, 3)
|
|
b = vec(3, 2, 1)
|
|
print a
|
|
print b
|
|
print a+b
|
|
print a*3.0
|
|
|
|
test()
|