mirror of
https://github.com/python/cpython.git
synced 2025-11-04 03:44:55 +00:00
54 lines
1,000 B
Python
Executable file
54 lines
1,000 B
Python
Executable file
# A simple vector class
|
|
|
|
|
|
def vec(*v):
|
|
return Vec(*v)
|
|
|
|
|
|
class Vec:
|
|
|
|
def __init__(self, *v):
|
|
self.v = list(v)
|
|
|
|
def fromlist(self, v):
|
|
if not isinstance(v, list):
|
|
raise TypeError
|
|
self.v = v[:]
|
|
return self
|
|
|
|
def __repr__(self):
|
|
return 'vec(' + repr(self.v)[1:-1] + ')'
|
|
|
|
def __len__(self):
|
|
return len(self.v)
|
|
|
|
def __getitem__(self, i):
|
|
return self.v[i]
|
|
|
|
def __add__(self, other):
|
|
# Element-wise addition
|
|
v = map(lambda x, y: x+y, self, other)
|
|
return Vec().fromlist(v)
|
|
|
|
def __sub__(self, other):
|
|
# Element-wise subtraction
|
|
v = map(lambda x, y: x-y, self, other)
|
|
return Vec().fromlist(v)
|
|
|
|
def __mul__(self, scalar):
|
|
# Multiply by scalar
|
|
v = map(lambda x: x*scalar, self.v)
|
|
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-b
|
|
print a*3.0
|
|
|
|
test()
|