这是大二和大三的时候学习python做的笔记

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def fun(a,b):
    return (a*b),(a/b)
cc,dd= fun(4,4) #同时接收两个值
print(cc)
print(dd)
def fun(a,b):
    return a+b
print(fun(3,4))
-----------------------------------------------------------------
def fun(*args):  #不定个数
    sum = 0
    for i in args:
        sum += i
    return sum
print(fun(3,4,5,7))
# ______________________100以下素数
def sushu(a):# 素数
    for i in range(2,a):
        if a%2==0:
            return False
    return True
def fun(num):
    bb=[]
    for j in range(2,num):
        if sushu(j):
            bb.append(j)
    return bb


a= int(input("输入一个数："))
cc=fun(a)
for h in cc:
    print(h,end=",")
-----------------------------------------------------------------
import math
def fun(a):
    a=a.lower()
    if a=='长方形':
        re()
    elif a=='圆形':
        cy()
    else:
        print("请输入长方形或圆形：")
def re():
    length=float(input("长："))
    width=float(input("宽："))
    area=length*width
    print("长方形的面积为：%.3f"% area)

def cy(): #求圆形面积函数


    banjing=float (input("半径："))
    area  = math.pi*math.pow(banjing,2)#POW幂
    print("{:.2f}".format(area))
shape_type = input("输入图形：\n")
fun(shape_type)

-------------------------------------------------------------------------------
alist = ["a","b","c"]
macat= {'name':'a','color':'b','size':'c'}#字典  (没有顺序)
print(macat['name'])
print(alist[0])
print()
macat['city']='chongqing'
print(macat)
print()
macat["color"]='abc'
print(macat)
print()
print(macat.values() )
print()
print(macat.keys() )  #字典的建

print()
print(macat.items() ) #字典项目

print('city' in macat)# 返回布尔值

print('abc' in macat.values() )# 返回布尔值

print(macat.get('name','none'))
print(macat.get('hah','none'))

#Python 字典(Dictionary) get() 函数
#返回指定键的值，如果值不在字典中返回默认值None。
dict.get(key, default=None)
#例子
dict = {'Name': 'Zara', 'Age': 27}
print "Value : %s" %  dict.get('Age')
print "Value : %s" %  dict.get('Sex', "Never")
#Value : 27
#Value : Never


del macat['city'] #删除
print(macat)
macat.clear() #全部清除


aaa = {'alppe':'5','cup':'15'}
aaa['abc']='8'
print(aaa)
aaa.setdefault('sa',0)
print(aaa)

aaa.setdefault('alppe',3)
print(aaa)

print("alppe is {} and {} eggs".format(aaa.get('alppe',0),aaa.setdefault(get("eggs",0))) )

------------------------------------------------------------------------------
a={'s':'1','d':'2','f':'3'}
print(a)
while True:
    shuzi = input()
    if shuzi == "":
        break
    elif shuzi in a:
        print("{} is the shuzi of {}".format(a[shuzi],shuzi) )

------------------------------------------------------------------------------
input().split
input() 接收多个用户输入需要与split()结合使用
print
a,b,c= input("请输入a,b,c并用- 分隔：").split("-")    # 注意input()的返回类型是str
print(a,b,c)
----------------------------------------------------------------------------
custmers= []
while True:
    aa=input("yes/no :")
    aa=aa[0].lower()  #把第一个字母变为小写
    if aa=='n':
        break
    else:
        aname,bname,gender= input().split()
        print(aname,bname,gender)
        custmers.append({"aname":aname,'bname':bname,'gender':gender})
for i in custmers :
    if  i['gender']=='m':
        title = 'Mr'+i['bname']
    else:
        title = 'Ms' + i['bname']
    print(''' Dear {},
    ai ni ha ha……
    '''.format(title))
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a=input("输入：")
b=''
for i in a:
    if i.isalpha():
        b+=str(ord(i)-23)
    elif i.isspace():
        b+=str(ord(i))
print("解密信息",b)
c=""
for j in range(0,len(b)-1,2):
    d=b[j]+b[j+1]
    if d!="32":
        c+=chr(int(d)+23)
    else:
        c+=chr(int(d))

print(c)
-------------------------------------------------------------------
a =input("输入密文")
b= input("偏移位数")
b=int(b)
c=""
for i in a:
    if i.isalpha():
        d=ord(i)+b
        if i.isupper():
            if d>ord("Z"):
                d-=26
            if d<ord("A") :
                d+=26
        if i.islower():
            if d>ord("z"):
                d-=26
            if d<ord("a") :
                d+=26
        c+=chr(d)
    else:
        c+=i
print(c)
b=-b
u=""
for i in c:
    if i.isalpha():
        d=ord(i)+b
        if i.isupper():
            if d>ord("Z"):
                d-=26
            if d<ord("A") :
                d+=26
        if i.islower():
            if d>ord("z"):
                d-=26
            if d<ord("a") :
                d+=26
        u+=chr(d)
    else:
        u+=i
print(u)
-----------------------------------------------------------------


a=list(range(10))
print(a)

help(type )

----------------------------------------------------------------------
import random#倒入模块“random工具箱”
import random
num1 = []
N = 10
for i in range(N):
  num1.append(random.randrange(1,10))#产生一个随机数1-10
print("原始列表",num1)
aa=len(num1)-1
while aa>0:
  j = 0
  while j<aa:
      if num1[j]>num1[j+1]:
          num1[j],num1[j+1] = num1[j+1],num1[j]  #交换
          j+=1
  for k in num1:
      print(k,end=",")
  print()
  aa-=1
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