python 笔记9

函数

#function neizhi
#abs  jueduizhi  min  duixiaozhi  max duidazhi
def a(x):
    return abs(x)
n=a(-10)
print n
def a(x,y,z):
    return max(x,y,z)
w=a(2,3,4)
print w
b="1qaz2wsx"
#jisuan  changdu
print len(b)
#divmod  quliang  shu  de shang yushu(2,0)
c=divmod(10,5)
print c[0]
print c[1]
d=pow(8,4)
#pow  8*8*8*8
print d
e=round(10)
#fandui  float
print e


#panduan shifou  fuhe   leixing
l=[1,1,2,3,4,4,5,6,7,1,23,1]
t=isinstance(l,list)
k=isinstance(1,int)

print t
print k

 #zifu chuan  bijiao
o=cmp("hello","hello")
print o



m=ord('a')
print m


#hex() 16 jinzhi
#oct() 8jinzhi
#chr() 97 ->a
#ord() 'a' 97

处理字符串：

#    deal string
#function str.capitalize  shou  zimu daxie
# str.replace
#str.split()
s="hello world"
d=str.capitalize(s)
print d

#tihuan
q="hello world"
a=q.replace("hello","good")
print a

#qie ge
ss="192.168.1.123"
b=ss.split(".",3)
print b

处理列表

#xulie  deal function
#filter() xuan  ze
def f(x):
    if x>5:
        return True
l=range(10)
t=filter(f,l)
print t
#zip() duoge  liebiao pi pei


name=['milo','adu','jun']
age=[20,30,40]
tel=['134','152','163']
yy=zip(name,age,tel)
print yy

#map() leisi  zip
zz=map(None,name,age,tel)
print zz
#map shixian xiangcheng
a=[1,3,5]
b=[2,4,6]
def mf(x,y):
    return x*y
ww=map(mf,a,b)
print ww
#reduce()
#reduce()
#1 +2+...+100
l=range(1,101)
def rf(x,y):
    return x+y
qq=reduce(rf,l)
print qq
#shixian 1+...100
print reduce(lambda x,y:x+y,l)

#qu oushu
print filter(lambda x:x%2==0,l)