'''集合'''
s = {3,2,3,5}
print(len(s))
s.add(6)
print(s)
#
'''列表'''
m =[1,3,4,1]
print(len(m))
m.append(7)
print(m)
#
'''字典'''
d = {'dogs':5, 'cats':4}
print(len(d))
print(d["dogs"])
d["pigs"]=7
print(d.keys())
print(d.values())
from numpy import array
'''数组Numpy Arrays'''
a =array([1,2,3,4])
b = a+2
print(a)
print(b)
'''循环loop'''
line = '1,3,3,4,5'
l = sum([int(field) for field in line.split(',')])
print(l)