一、数据类型
数字类型：
整型int
用来表示：等级，年龄，×××号，学号，id号
level=10
print(type(level),id(level),level)
<class 'int'> 1993698608 10
#浮点型float
#用来表示：身高，体重，薪资
salary=3.1
height=1.80
print(id(salary),type(height),salary)
2996881593040 <class 'float'> 3.1
# 字符串str：包含在引号（单引号，双引号，三引号）内的一串字符
# 用来表示：名字，家庭住址，描述性的数据
name='egon'
sex="woman"
des="""hobby:man,play,read"""
print(name,sex,des,type(name),type(sex),type(des))
egon woman hobby:man,play,read <class 'str'> <class 'str'> <class 'str'>
#字符串拼接：+，*
# s1='hello '
# s2="word"
# print(s1+s2)
hello word
# s3="""s_jun """
# print(s3*3)
s_jun s_jun s_jun
#列表：定义在[]中括号内，用逗号分隔开多个值，值可以是任意类型
#用来存放多个值：多个爱好，多个人名
stu_names=['egon','hobby','age']
print(id(stu_names),type(stu_names),stu_names,stu_names[1])
2389078272136 <class 'list'> ['egon', 'hobby', 'age'] hobby
user_info=['egon',18,['read','music','play','dancing']]
print(user_info[2][1])
music
#字典：定义{}内用逗号分隔开，每一个元素都是key:value的形式，其中value可以是任意类型，而key一定要是不可变类型
user_info={'name':'egon','age':18,'hobbies':['read','music','dancing','play']}
print(type(user_info),user_info['name'],id(user_info),user_info['hobbies'][3])
<class 'dict'> egon 2025116757160 playinfo={
'name':'egon',
'hobbies':['play','sleep'],
'company_info':{
'name':'Oldboy',
'type':'education',
'emp_num':40,
}
}
print(info['company_info']['name'])
Oldboystudents=[
{'name':'alex','age':38,'hobbies':['play','sleep']},
{'name':'egon','age':18,'hobbies':['read','sleep']},
{'name':'wupeiqi','age':58,'hobbies':['music','read','sleep']},
]
print(students[1]['hobbies'][0])students={
'alex':{
'age':84,
'hobbies':['play','sleep']
},
'egon':{
'age':18,
'hobbies':['play',]
}
}
print(students['egon']['age'])
18#布尔类型bool：True，False
#用途：判断
age_of_oldboy=18
inp_age=input('your age: ')
inp_age=int(inp_age)
if inp_age > age_of_oldboy:
print('猜大了')
elif inp_age < age_of_oldboy:
print('猜小了')
else:
print('猜对了')# 布尔类型的重点知识！！！：所有数据类型，自带布尔值
#只有三种类型的值为False
# 0
# None
# 空:'',[],{}
if '':
print('0===>')
if []:
print('[]')
if {}:
print('{}')
if None:
print('0===>None')
if 0:
print('00')#其余全部为真
if ['',]:
print('1====>')
if {'':'',}:
print('2===?')
if True:
print('3===>?')# 可变类型与不可变类型
# 可变：在id不变的情况，值可以改变
×××：
x=1
print(id(x),type(x),x)
x=2
print(id(x),type(x),x)
-----------------------------------
1993698320 <class 'int'> 1
1993698352 <class 'int'> 2
列表：
x=['a','b','c']
print(id(x),type(x),x)
x[2]=10
print(x)
print(id(x),type(x),x)
---------------------------------
2467516409224 <class 'list'> ['a', 'b', 'c']
['a', 'b', 10]
2467516409224 <class 'list'> ['a', 'b', 10]
字典：
dic={'x':1,'y':2}
print(id(dic),type(dic),dic)
dic['x']=111111111
print(id(dic),type(dic),dic)# 不可变类型：数字，字符串
# 可变类型：列表,字典
# dic={[1,2,3]:'a'}
二、格式化输出
name="s_jun"
age=20
print('my name is %s my age is %s' %(name,age))
my name is s_jun my age is 20print('my name is %s my age is %s'%('egon',18))
print('my name is %s my age is %d'%('egon',18))
x='my name is %s my age is %d' %('egon',18)
print(x)
-----------------------------------
my name is egon my age is 18
my name is egon my age is 18
my name is egon my age is 18name="s_jun"
msg="""
------------ info of %s -----------
Name : %s
------------- end -----------------
"""%(name,name)
print(msg)
------------------------------------------------------------------------
------------ info of s_jun -----------
Name : s_jun
------------- end -----------------
age=20
A=' %s '%(age)
print(A)
-------------------------------------
20
三、基本运算符
print(10/3)
print(10//3)
print(10%3)
print(3**3)
-----------------------
3.3333333333333335
3
1
27
增量赋值
age=18
age+=2 # age=age+2
print(age)
age-=10 #age=age-10
print(age)
-----------------------
20
10
#逻辑运算
#and:逻辑与,and用于连接左右两个条件,只有在两个条件判断的结果都为True的情况下,and运算最终的结果才为True
print(1 > 2 and 3 > 4)
print(2 > 1 and 3 > 4)
print(True and True and True and False)
-------------------------------------------
False
False
False
#or:逻辑或,有一个为真结果就为真
print(True or False)
print(True or False and False)
print((True or False) and False)
print(not 1 > 2)
------------------------------------
True
True
False
True
四、流程控制之if
sex='female'
age=20
is_beutiful=True
if sex == 'female' and age > 18 and age < 26 and is_beutiful:
print('表白....')
--------------
表白....sex='female'
age=20
is_beutiful=True
if sex == 'female' and age > 18 and age < 26 and is_beutiful:
print('表白....')
else:
print('阿姨好')
-------------------------------
表白....age_of_oldboy=18
inp_age=input('your age: ')
inp_age=int(inp_age)
if inp_age > age_of_oldboy:
print('猜大了')
elif inp_age < age_of_oldboy:
print('猜小了')
else:
print('猜对了')username='s_jun'
password='123'
inp_name=input('name>>: ')
inp_pwd=input('password>>: ')
if inp_name == username and inp_pwd == password:
print('login successfull')
else:
print('user or password not vaild')sex='female'
age=20
is_beutiful=True
is_successful=False
if sex == 'female' and age > 18 and age < 26 and is_beutiful:
print('表白....')
if is_successful:
print('在一起')
else:
print('对不起,我也不喜欢你,我逗你玩呢...')
else:
print('阿姨好')
------------------------------------------
表白....
对不起,我也不喜欢你,我逗你玩呢...'''
如果：成绩>=90，那么：优秀
如果成绩>=80且<90,那么：良好
如果成绩>=70且<80,那么：普通
其他情况：很差
'''
score=89
if score >= 90:
print('优秀')
elif score >= 80:
print('良好')
elif score >= 70:
print('普通')
else:
print('很差')
-----------------------
良好五、流程控制之while
while:条件循环
import time
count=1
while count < 3:
print('=====>',count)
time.sleep(0.1)count=1
while count <= 3:
print('=====>',count)
count+=1#break:跳出本层循环
age_of_oldboy=18
while 1:
inp_age=input('your age: ')
inp_age=int(inp_age)
if inp_age > age_of_oldboy:
print('猜大了')
elif inp_age < age_of_oldboy:
print('猜小了')
else:
print('猜对了')
breakage_of_oldboy=18
count=0
while count < 3:
inp_age=input('your age: ')
inp_age=int(inp_age)
if inp_age > age_of_oldboy:
print('猜大了')
elif inp_age < age_of_oldboy:
print('猜小了')
else:
print('猜对了')
break
count+=1
print('猜的次数',count)age_of_oldboy=18
count=0
while True:
if count == 3:
print('try too many times')
break
inp_age=input('your age: ')
inp_age=int(inp_age)
if inp_age > age_of_oldboy:
print('猜大了')
elif inp_age < age_of_oldboy:
print('猜小了')
else:
print('猜对了')
break
count+=1
print('猜的次数',count)#continue:跳过本次循环,进入下一次循环
count=1
while count < 5: #3
if count == 3:
count += 1
continue
print(count)
count+=1
while True:
print('=========>')
continue
print('=========>')
print('=========>')
print('=========>')while True:
inp_name=input('name>>: ')
inp_pwd=input('password>>: ')
if inp_name == "s_jun" and inp_pwd == "123":
print('login successfull')
while True:
cmd=input('cmd>>>: ')
if cmd == 'quit':
break
print('%s 命令正在执行...' %cmd)
break
else:
print('user or password not vaild')tag=True
while tag:
inp_name=input('name>>: ')
inp_pwd=input('password>>: ')
if inp_name == "s_jun" and inp_pwd == "123":
print('login successfull')
while tag:
cmd=input('cmd>>>: ')
if cmd == 'quit':
tag=False
continue
# break
print('%s 命令正在执行...' %cmd)
else:
print('user or password not vaild')