python基础知识,python必背内容,一、python的基


一、python的基础

1、简单写一行python代码:

print(‘hello,world’)print(‘你好,北京’)

2、变量:

name="刘梦雅"print(name)

程序交互:

name=input“请输入你的名字”print(name)

3、数据类型

(1)int,long类型:

a=2*20print(a,type(a))

(2)字符串类型str:

name=input(‘请输入你的名字‘)print(name,type(name))()

(3)布尔类型:

print(true,type(true))

4、if语句

choice=input(‘请输入你猜的数字’)if  choice==‘2’   print(‘我请你吃饭’)else print(‘你请我吃饭’)

5、while语句

flag = true;count =1;while flag:    print(count);

6、break语句:

count=1while  true:    print(count)   count=count+1 if count==101  break

7、continue语句

count=0 while count<10;  count =count +1if count ==7;continue ;print(count )

8、in not in的用法:

comment =input(‘请输入你的评论’)    if  ‘傻子’ in  comment:        print (‘您输入的为敏感词汇,请重新输入’)

9、while else

技术分享图片
count = 1while True:    print (count )    if count == 3:break        count +=1else     print(‘循环正常‘)
技术分享图片

输出 1

   2

3

技术分享图片
count =1flag = Truewhile flag :    print (count)    if count == 3:        flag=False     count+=1else :     print (‘循环正常完毕‘)
技术分享图片

输出:1

   2

   3

循环正常完毕

10、格式化输出:

1)第一种

name=input(‘请输入你的名字:’)age  =input(‘请输入你的年龄:’)hobby=input(‘请输入你的爱好:’)ms =‘我叫%s,今年%d,爱好是%s’ % (name,int(age),hobby)print(ms)

2)第二种

dic = {‘name’:‘oldboy‘,‘age‘:15,‘hobby‘:‘踢足球‘}msg=‘我叫%(name)s,今年%(age)d,爱好是%(hobby)s’ % dicprint(msg)

3)第三种

再格式化输出中单纯的显示% 用%%解决

name=input(‘请输入你的名字:’)age  =input(‘请输入你的年龄:’)msg=‘我叫%s,今年%d,学习进度为1%%’ % (name,int(age))print(msg)

11、运算符

print(int(True))print (int(False))           输出:1  0   Trueprint(bool(100))

and or not

print (1   or    3)                          输出   1print  (1  and 3 )                                  3print (0   or  2)                                    2print(0  and 2)                                     0print  (1>2 or 3 and  4)                       4

python基础知识

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