匿名函数

# 匿名函数:简化函数的定义
# 格式：lambda 参数1，参数2，参数3...:运算部分
'''s = lambda a,b : a+b
print(s) # <function <lambda> at 0x0399B808> 返回了一个内存空间，这是一个函数（function)
rusult = s(1,2)
print(rusult)'''
# 匿名函数作为参数
from functools import reduce

'''def func(x,y,func):
    print(x,y)
    print(func)
    s = func(x,y)
    print(s)


func(1,2,lambda a,b : a+b)'''

# 匿名函数和内置函数的应用
'''list1 = [1,2,3,4,56,7,89,51,231]
m = max(list1)
print(m)
list2 = [{'1':2,'2':3,'3':4},{'1':21,'2':31,'3':41},{'1':22,'2':32,'3':42},{'1':23,'2':33,'3':43}]
max(list2,key=lambda x:x['a'])'''
# map函数   Make an iterator that computes the function using arguments from
#     each of the iterables.  Stops when the shortest iterable is exhausted.
'''list1 = [1, 2, 3, 5, 6, 9, 7, 411, 22]
result = map(lambda x: x + 2, list1)
print(list(result))

result = lambda x: x if x % 2 == 0 else x + 1
r = result(5)
print(r)

cc = map(lambda x: x if x % 2 == 0 else x + 1,list1)
print(list(cc))
'''

# reduce函数 对列表进行加减乘除运算的一个函数
'''tuple = (3,5,7,9,11)
a = reduce(lambda x,y : x+y , tuple)
print(a)
'''
# filter是一个过滤属性的函数
'''
list1 = [1,2,3,4545,4,56,123,15,465,423,1]
a = filter(lambda x : x>10 , list1)
print(list(a))
'''

#找出大于18岁的同学
'''
student =[ {'name': 'zzh1', 'age':19},
    {'name': 'zzh2', 'age':18},
    {'name': 'zzh3', 'age':118},
    {'name': 'zzh4', 'age':1118},
    {'name': 'zzh5', 'age':11118},
    {'name': 'zzh6', 'age':8}]
a = filter(lambda  x : x  ['age'] > 18 ,student)
print(list(a))



#年龄从小到大排序
student = sorted(student,key=lambda x:x['age'],reverse=True)
print(student)'''

'''
max()：最大值
min()：最小值
sorted():排序
map()：对列表中每个元素进行操作
reduce()：对列表累加
filter():对列表进行过滤
'''