v = [lambda :x for x in range(10)]
print(v) #[lambda :x,lambda :x....]10个匿名函数
print(v[0]) #lambda :x
print(v[0]()) #9
v = (lambda :x for x in range(10))
print(v) #生成器
# print(v[0]) #报错：生成器不能索引取值
# print(v[0]()) #报错：生成器不能索引取值
print(next(v)) #lambda :x
print(next(v)()) #1
def extendList(val, list=[]):
list.append(val)
return list
list1 = extendList(10)
list2 = extendList(123, [])
list3 = extendList('a')
print('list1=%s' % list1) # list1=[10,'a']
print('list2=%s' % list2) # list2=[123]
print('list3=%s' % list3) # list3=[10,'a']
def add(a, b):
return a + b
def test():
for i in range(4):
yield i
g = test() # 生成器
for n in [2, 10]:
g = (add(n, i) for i in g)# 生成器
print(list(g))#[20,21,22,13]
#n=2：
# 循环体执行时i对应的值 (0,1,2,3)
# 循环体执行之后：g类似于[add(n, 0)，add(n, 1)，add(n, 2)，add(n, 3)]
#n=10时：
# 循环体执行时i 的值 (10,11,12,13)-----对n=2循环之后的g进行取值
# 循环体执行之后：list(g)=（add(n, 10)，add(n, 11)，add(n, 12)，add(n, 13)）
li = [7,-8,5,4,0,-2,-5]
print(sorted(li,key=lambda x:(x<0,abs(x))))
print(5/2)
print(5.0/2)
print(5/2.0)
print(5.0/2.0)
print(5//2)
print(5.0//2)
print(5//2.0)
print(5.0//2.0)
#python3中 2.5 2.5 2.5 2.5 2 2.0 2.0 2.0
#python2中 2 2.5 2.5 2.5 2 2.0 2.0 2.0
dic={x:y for x in ['Male','Female'] for y in ['Red','Black']}
print(dic)
# {'Male':'Black','Female':'Black'}
li=[(x,y) for x in ['Male','Female'] for y in ['Red','Black']]
print(li)
#[('Male','Red'),('Male','Black'),('Female','Red'),('Female','Black')]
li=[[]]*5 #[[], [], [], [], []]
li[0].append(1) #[[1], [1], [1], [1], [1]]
li[3].append(0) #[[1, 0], [1, 0], [1, 0], [1, 0], [1, 0]]
li.append(8) #[[1, 0], [1, 0], [1, 0], [1, 0], [1, 0],8]
print(li)
t=((1,2))*5 #(1, 2, 1, 2, 1, 2, 1, 2, 1, 2)
t1=((1,2),)*5 #((1, 2), (1, 2), (1, 2), (1, 2), (1, 2))
print(t)
print(t1)
for x in range(5):
pass
print(x) #4
def f():
x = 0
for i in range(5):
x += i
f()
print(x)
