pyrhon3 Day1

（一）基本数据类型：

str 字符串    int  整数

数字： 不加  '' （引号）默认是数字类型

int      整数   不加''默认是数字类型

          type（...） 查看数据类型

                            python3里所有的整数都按 int  类处理

其他语言中必须在声明变量前先定义好其类型。强类型

python  弱类型

float   浮点数~小数

字符串：

定义

name = "qiangzi"   #有引号就是字符串

''(单引号）""(双引号）''' ''''(三引号段落）"i'm qiangzi"

拼接

>>> s1="床前明月光"
>>> s2="疑是地上霜"
>>> print(s1+s2)
床前明月光疑是地上霜

>>> s1="我是强子。"
>>> s1*3
'我是强子。我是强子。我是强子。'

段落

 name ='''

    qiangzi

... xiaofang
... gouzi
... '''
 print(name)
qiangzi
xiaofang
gouzi

（二）bppl  布尔类型

a=3

b=5

a<b  正确的|成立的     真   Ture

>>> a=3
>>> b=5
>>> a<b
True

a>b 错误的|不成立的  假f   False

>>> a=3
>>> b=5
>>> a>b
False

猜年龄游戏：

age_of_qiangzi = 25
count = 0
while count<3:
    guess_age = int(input("age_of_qiangzi:"))
    if guess_age == age_of_qiangzi:
        print("yes,you got it!")
        break
    elif guess_age < age_of_qiangzi:
        print("think bigger!")
    else:
        print("think smaller!")
    count += 1
    if count == 3:
        countine_confirm = input("do you want to mang times..?")
        if countine_confirm != 'n':
            count = 0
else:
    print("GAME OVER!!")

（三）列表

#列表、数据
#元素名：      qiangzi  longzong  xifeng  xiaofang  shijia
#下标（索引）：     0       1        2        3        4

["",""]  列表格式

names = ["qiangzi","longzong","xifneg","xiaofang","shjia"]
#"qiangzi"  叫元素

增
   插入  .insert

names = ["qiangzi","longong","xifeng","xiaofnag","shijia"]
>>> #.insert(x,"")插入
... names.insert(4,"daqiang")
>>> print(names)
['qiangzi', 'longong', 'xifeng', 'xiaofnag', 'daqiang', 'shijia']

           追加 .append    元素插入在列表最后

>>> names = ["qiangzi","longong","xifeng","xiaofnag","shijia"]
>>> #.append("")追加
... names.append("xiaoqiang")
>>> print(names)
['qiangzi', 'longong', 'xifeng', 'xiaofnag', 'shijia', 'xiaoqiang']

    删   del[x]

names = ["qiangzi","longong","xifeng","xiaofnag","shijia"]
>>> #del[x]删除
... del(names[1])
>>> del(names[-1])
>>> print(names)
['qiangzi', 'xifeng', 'xiaofnag']

   改

>>> names = ["qiangzi","longong","xifeng","xiaofnag","shijia"]

>>> #直接赋值 names[x] = ""
... names[-1] = "事假"
>>> print(names)
['qiangzi', 'longong', 'xifeng', 'xiaofnag', '事假']

查

>>> names = ["qiangzi","longong","xifeng","xiaofnag","shijia"]
>>> print(names[0])
qiangzi
>>> #查询元素是否在列表里
... print("qiangzi" in names)
True
>>> #.index 查询列表里元素的下标（索引）
... del(names[names.index("qiangzi")]) #命令嵌套
>>> print(names)
['longong', 'xifeng', 'xiaofnag', 'shijia']

（四）读取格式化输入、入库、查询

#信息格式化输入、存库、查找 源码
names = ["longzong","liye","wangcong"]
Names = input("姓名:",)
Pressional = input("专业：")
Class_and_grade = input("班级：")
Student_number = int(input("学号："))
msg ='''
-----------学生信息----------
姓名：%s    
专业：%s
班级：%s
学号：%d
-------------end------------
'''    %(Names,Pressional,Class_and_grade,Student_number)
print(msg)
names.append(Names)#追加元素
print(names)
print(Names in names)
print(names[-1])

E:\python\venv\Scripts\python.exe E:/python/匹配成绩的小游戏.py
姓名:强子
专业：电气工程及其自动化
班级：电气17-3班
学号：20170584

-----------学生信息----------
姓名：强子
专业：电气工程及其自动化
班级：电气17-3班
学号：20170584
-------------end------------

['longzong', 'liye', 'wangcong', '强子']
True
强子

Process finished with exit code 0

基本计算符

计算机可以进行的运算有很多种，可不只加减乘除这么简单，运算按种类可分为算数运算、比较运算、逻辑运算、赋值运算、成员运算、身份运算、位运算，今天我们暂只学习算数运算、比较运算、逻辑运算、赋值运算

算数运算

以下假设变量：a=10，b=20

比较运算

以下假设变量：a=10，b=20

赋值运算

以下假设变量：a=10，b=20

逻辑运算

流程控制
if...else...
单分支
the weather = "randy"
    if the weather == "randy":
         print("带伞”）

双分支

'''_username = "qiangzi"
_password = "zj521."
username = input("username:")
password = input("password:")
if _username == username and _password == password:
    print("Welcome user {name} loading...!".format(name = username))
else:
    print("Inlated username and password!")





age_of_qiangzi = 25
count = 0
while count<3:
    guess_age = int(input("guess_age:"))

    if guess_age == age_of_qiangzi:
        print("Yes,you got it!")
        break
    elif guess_age > age_of_qiangzi:
        print("Think smaller!")
    else:
        print("Think bigger!")
    count +=1
    if count == 3:
        countine_confirm =  input("do you want to keep guessing...?")
        if countine_confirm != "n":
            count = 0
#else:
   # print("you have tried too many times..fuck off")





age_of_qiangzi = 25
count = 0
while count<3:
    guess_age = int(input("age_of_qiangzi:"))
    if guess_age == age_of_qiangzi:
        print("yes,you got it!")
        break
    elif guess_age < age_of_qiangzi:
        print("think bigger!")
    else:
        print("think smaller!")
    count += 1
    if count == 3:
        countine_confirm = input("do you want to mang times..?")
        if countine_confirm != 'n':
            count = 0
else:
    print("GAME OVER!!")




多分支
age_of_qiangzi = 25
count = 0
while count< 3:
     guess_age = int(input("age_of_qiangzi:"))
     if guess_age == age_of_qiangzi:
       print("yes, you got it!!")
       break
     elif guess_age < age_of_qiangzi:
       #break
 #   elif guess_age < age_of_qiangzi
       print("think bigger!!")
     else:
#    else:
       print("think  smaller!")
     count +=1
     if count == 3:
       countine_confirm = input("do you want to keep guessing...?")
       if countine_confirm != "n":
        count = 0
else:
    print("GAME OVER!")'''

#打印0到100偶数
count = 0
while count < 100:
    if count % 2 == 0:
        print("fuck you!",count)
    count += 1