1,print('linking'),print(133)  true
    print('linking'+12332) flase
2True不是true
    True是其他非0的正整数字，flase是0
3python 数组下标
a=range(10)
while a:
    print(a[-2])
    a=a[:len(a)-1]

4python使用缩进实现block，循环后面记得加上：
example_list=[1,23,6,56456,48,564,6354,684,]
for i in example_list:
    print(i)
    print('rilegoule')
print('end!!!!!!!!!!!!!!!!!!!')
5，python的一些常见函数
    range(start,end,step)
    zip(a,b):ab2个list合并
6,python的四种集合
    tuple：a_tuple = (12, 3, 5, 15 , 6)，一连串有顺序的数字
    list：a_list = [12, 3, 67, 7, 82]，列表是一系列有序的数列
        a=[1,2,3,4,2]
        print(a[0])
        print(a[-1])
        print(a[0:3])
        print(a[3:])
        print(a[-3:])
        print(a.index(2))
        print(a.count(2))
        a.sort()
        print(a)
        a.sort(reverse=True)
        print(a)

    dict：key-value.无序
,set
7一个python文件中的结构，class,def，变量在那些地方

8为什么不报错？
x='a'
y=2
z=3
if x<y:
    print('x is less than y')
9python的行内表达式代替三木运算
work=True
result='done' if work else 'not yet'
print(result)
10 函数的默认值
def functionAdd(a='li',b='jun'):
    c=a+b
    print('nidieshi'+c)
functionAdd()
functionAdd('li','jun') 
11,block可以编辑全局变量，
apple=1000
bpple=None
def var():
    a=10
    print(a)
    
    global b
    b=20
    print(b)
    
    #print apple
    print  apple
    global bpple
    bpple='lijun'
    return 'woshinidie'
print(var())
print(apple)
print(bpple)
print(b)
12 python 安装包pip install xxx,更新 pip install -U xxx
13 python文件读取，open('my file.txt','a'/'w'/'r') -->write-->close
    open -->file.read()
14 class与def,none是哪里的
class Classmates:
    name='lijun'
    age='24'
    def add(self,x,y):
        print(self.name)
        result=x+y
        print(result)
    def times(self,x,y):
        print(self.name)
        result=x*y
        print(result)
cal=Classmates()
print(cal.name)
print(cal.add(10,10))import time
print(time.localtime())
import time as t
print(t.localtime())
from time import time,localtime
print(localtime())
print(time())
from time import *
print(localtime())
print(cal.times(10,10))

lijun
lijun
20
None

15
lijun
100
None
15，__init__，初始化对象的，构造函数
class Calculator:
    name='good calculator'
    price=18
    def __init__(self,name,price,hight=10,width=14,a=[1,2,3,4,2]
print(a[0])
print(a[-1])
print(a[0:3])
print(a[3:])
print(a[-3:])
print(a.index(2))
print(a.count(2))
a.sort()
print(a)
a.sort(reverse=True)
print(a)
weight=16): 
        self.name=name
        self.price=price
        self.h=hight
        self.wi=width
        self.we=weight
c=Calculator('bad',18)
print(c.h,c.wi,c.h,c.name,c.price)
16,input读取数据
socre=int(input('plase send me your grade'))
if socre>=90:
    print('a')
if 60<=socre<90:
    print('b')
else:
    print('you are go out')
17，导包的模式
import time
print(time.localtime())
import time as t
print(t.localtime())
from time import time,localtime
print(localtime())
print(time())
from time import *
print(localtime())
18，异常处理
try:
    file=open('eeee.txt','r') 
except Exception as e: 
    print(e)

19,lambda
fun= lambda x,y:x+y
 #这里要定义int整数，否则会默认为字符串
x=int(input('x='))   
y=int(input('y='))
print(fun(x,y))
20.python的深copy与浅copy.
import copy
a=[1,2,3]
id(a)#显示a的内存地址
c=copy.copy(a)#与a内存地址不一样，只是值
d=copy.deepcopy(a)#与a内存地址一样```