函数和作用域

#作用域
#匿名函数
def isodd(x):
    return x%2

a=isodd(10)
print(a)

isodd = lambda x: x%2
#无参数
#func= lambda:3,14
#func()
#print(a)
myadd = lambda x,y:x+y
A=myadd(1,2)
print(A)

mysum= lambda x,y,*args:x+y+sum(args)
mysum(1,2,3,4,5)

dlist=[{'name':'sun','age':10},{'name':'li','age':13},{'name':'zhao','age':12}]
sorted(dlist,key=lambda item:item.get('age'))

#函数式编程
l=['1','2','3']
[int(val)for val in l]
r=map(int,l)
list(r)

r1= [90,80,40]
r2=[88,92,77]
r=map(lambda x,y:x+y,r1,r2)
print(list(r))

#消费统计
bill=['Apple 20','Pear 5','Banana 10']
r=map(lambda x:x.split()[-1],bill)
value = list(r)
print(value)
print(sum(map(int,value)))

#reduce
from functools import reduce

#1~10阶乘
reduce(lambda x,y:x*y,range(1,11))



#filter
#1.循环调用function
#2.保留被function处理的结果为True元素

#过滤偶数
l=[1,2,3,4,5,6]
list(filter(lambda x:x%2==0,l))

#过滤成绩
report=[[90,80],[50,70],[50,45]]
r=filter(lambda item:sum(item)/len(item) >=60,report)
print(list(r))



#闭包函数内部定义函数,内部函数使用外部变量，称之为闭包
def loginfo(msg,*args,**kwargs):
    print('info:',msg)

def debug(msg,*args,**kwargs):
    print('debug:',msg)

def logerror(msg,*args,**kwargs):
    print('error:',msg)

def warning(msg,*args,**kwargs):
    print('warning:',msg)

def logfunc():
    level='info'
    def logmsg(msg,*args,**kwargs):
        print(f"{level}{msg}")
    return logmsg
f=logfunc()

#函数当参数
def str2int(value):
    print('in str2inf')
    return int(value)

def pdeal(f):
    def deal(value):
        v = value.strip()
        return f(v)
    return deal

func=pdeal(str2int)
func('100')