Python-100道练习题答案

题目链接：http://www.runoob.com/python/python-100-examples.html

#5.

# def find_max():

#     a=int(input("输入:"))

#     b = int(input("输入:"))

#     c = int(input("输入:"))

#     list_=[a,b,c]

#     print(list_)

#     list_.sort()

# find_max()

#6.

# def f(a):

#     if a==1 or a==2:

#         flag=-1

#         return 1

#     else:

#         return f(a-2)+f(a-1)

# print(f(12))

# for i in range(1,13):

#     print(f(i))

#

# a=[1,2,3,5,4,3,32,2]

# b=a[:]

# print(b)

#

# for i in range(1,10):

#     for j in range(1,i+1):

#         print("%d * %d = %d "%(i,j,j*i),end="")

#     print()

#

# import time

# time.sleep(1)

# print("s")

#

# import time

# print(time.strftime("%Y-%m-%d %H:%M:%S",time.localtime(time.time())))

# time.sleep(1)

# print(time.strftime("%Y-%m-%d %H:%M:%S",time.localtime(time.time())))

#

# def f(a):

#     if a==1 or a==2:

#         return 1

#     else:

#         return f(a-1)+f(a-2)

# print(f(11))

#

# import math

# def sushu():

#     a=[x for x in range(100,201)]

#     for i in a:

#         flag = 1

#         b=int(math.sqrt(i // 2 + 1))+1

#         for j in range(2,b):

#             if i%j==0:

#                 flag=-1

#                 break

#         if flag==1:

#             print(i)

# sushu()

#

# def f():

#     for i in range(100,1000):

#         b=i//100

#         s=i//10%10

#         g=i%10

#         if b**3+s**3+g**3==i:

#             print(i)

# f()

#

# import math

# def f(a):

#     print("{}=".format(a),end="")

#     c=[]

#     i=2

#     while i <=a:

#         if a%i==0:

#             c.append(i)

#             a=a/i

#             print("{}*".format(i),end="")

#             i=2

#         else:

#             i+=1

# f(100)

#

# def f():

#     a=float(input("输入成绩:"))

#     if 90<=a<=100:

#         print("成绩是:A")

#     elif 70<=a<90:

#         print("成绩是:B")

#     else:

#         print("成绩是:C")

# f()

#

# import time

# a=time.strftime("%Y-%m-%d %H:%M:%S",time.localtime(time.time()))

# print(a)

#

# def f():

#     space=0

#     digit=0

#     alpha=0

#     other=0

#     a=input("输入任意内容")

#     a=list(a)

#     for i in a:

#         if i.isspace():

#             space+=1

#         elif i.isalpha():

#             alpha+=1

#         elif i.isdigit():

#             digit+=1

#         else:

#             other+=1

#     print("字母是%d个,数字是%d个,空格是%d个,其他是%d个"%(alpha,digit,space,other))

# f()

#

# def f(a,num):

#     sum_a_num=0

#     if num==0:

#         print("0")

#     else:

#         for i in range(num):

#             for j in range(-1,i):

#                 print(a,end="")

#             print()

#     print(sum_a_num)

# f(2,5)

# def f(a,num):

#     c=[]

#     t=0

#     if num==0:

#         print("0")

#     else:

#         for i in range(num):

#             t=t+a

#             a=a*10

#             print(t)

#             c.append(t)

#     print(sum(c))

# f(2,5)

#

# def f():

#     for i in range(2,1001):

#         c = []

#         for j in range(1,i//2+1):

#             if i%j==0:

#                 c.append(j)

#         if sum(c)==i:

#             for k in c:

#                 print(k,end=",")

#             print()

#             print(i)

# f()

#

# def high(n):

#     h=100

#     n_high=100/(2**(n))

#     print(n_high)

# high(10)

#

# num=1

# for i in range(1,10):

#     num=2*(num+1)

# print(num)

#

# def f():

#     jia="abc"

#     yi="xyz"

#     for i in jia:

#         for j in yi:

#             if (i=="a" and  j=="x")  or (i=="c" and  j=="x" )or (i=="c" and  j=="z" ):

#                 print(i,j)

# f()

# #23

# for i in range(1,4):

#     for j in range(1,4-i):

#         print(" ",end="")

#     for k in range(1,2*i+1-1):

#         print("*",end="")

#     print()

# for i in range(1,3):

#     for j in range(1,i+1):

#         print(" ",end="")

#     for k in range(1,2*(3-i)+1-1):

#         print("*",end="")

#     print()

#

# def f():

#     i=2

#     j=1

#     a=0

#     for x in range(10):

#         a = i / j

#         b=j

#         j = i

#         i = i + b

#         # a+=a

#         print(a)

# f()

#

# def f():

#     sum_=0

#     for i in range(1,21):

#         s=1

#         for j in range(1,i+1):

#             s=s*j

#         sum_+=s

#     print(sum_)

# f()

#

# def f(n):

#     if n==1:

#         return 1

#     else:

#         return n*f(n-1)

# print(f(5))

#

# def f(a,b):

#     if b>=1:

#         print(a[b-1],end="")

#         return f(a,b-1)

#     else:

#         exit()

# str_=input("字符串:")

# len_str=len(str_)

# f(str_,len_str)

#

# def f(n):

#     if n==1:

#         return 10

#     else:

#         return 2+f(n-1)

# print(f(5))

#

# def f():

#     a=int(input("输入数字"))

#     b=str(a)

#     len_a=len(b)

#     print("长度是:",len_a)

#     for i in range(len_a):

#         print(b[len_a-i-1],end="")

# f()

#

# def f():

#     a=input("输入:")

#     len_a=len(a)

#     len_a2=len(a)//2

#     for i in range(len_a2):

#         flag = 1

#         if a[len_a-i-1]!=a[i]:

#             print("不是回文")

#             flag=-1

#             break

#     if flag==1:

#         print("回文")

# f()

#

# def f():

#     a=input("输入:")

#     if a[0].lower()=="w":

#         print("星期三")

#     elif a[0].lower()=="m":

#         print("星期一")

#     elif a[0].lower()=="f":

#         print("星期五")

#     elif a[0].lower()=="t":

#         if a[1].lower()=="h":

#             print("星期四")

#         else:

#             print("星期二")

#     elif a[0].lower()=="s":

#         if a[1].lower()=="a":

#             print("星期六")

#         else:

#             print("星期日")

# f()

#

# def f():

#     a=input("输入:")

#     a=list(a)

#     lena=len(a)

#     len_a=len(a)-1

#     for i in range(lena):

#         print(a[len_a-i],end="")

# f()

#

# a=[1,2,3]

# print("_".join(str(x) for x in a))

#

# def func1():

#     print("这是函数1")

# def func2():

#     func1()

#     print("这是函数2")

# func2()

#

#

# import math

# def f():

#     a=[i for i in range(1,101)]

#     print(a)

#     for k in range(4,101):

#         b=int(math.sqrt(k))+1

#         print(b)

#         for j in range(2,b):

#             if k%j==0:

#                 a.remove(k)

#                 break

#     print(a)

# f()

#

# def f():

#     a=list(input("输入数字:"))

#     print(a)

#     len_a=len(a)

#     for i in range(len_a):

#         for j in range(i+1,len_a):

#             if a[i]<=a[j]:

#                 k=a[i]

#                 a[i]=a[j]

#                 a[j]=k

#     print(" ".join(a))

# f()

#

# a=[]

# for i in range(0,4):

#     b=[]

#     for j in range(1,5):

#         b.append(i+j)

#     a.append(b)

# print(a)

# len_a=len(a)

# len_a_=len(a[0])

# sum_=0

# for i in range(len_a):

#     for j in range(len_a_):

#         if i==j:

#             sum_+=a[i][j]

# print(sum_)

#

# def f():

#     a=list(input("输入:"))

#     len_a=len(a)

#     for i in range(len_a):

#         for j in range(i+1,len_a):

#             if a[i]<=a[j]:

#                 k=a[i]

#                 a[i]=a[j]

#                 a[j]=k

#     print(a)

#     print(" ".join(a))

#     b=input("输入一个数:")

#     for i in range(len_a):

#         if int(b)>=int(a[i]):

#             a.insert(i,b)

#             break

#     print(" ".join(a))

# f()

#

# def f():

#     a=tuple(input("输入:"))

#     len_a=len(a)

#     for i in range(len_a):

#         print(a[len_a-1-i],end="")

# f()

#

# def f():

#     var=0

#     print("var是:",var)

#     var+=1

# for i in range(3):

#     f()

# class A():

#     var=0

#     def f(self):

#         self.var+=1

#         print("var是:",self.var)

# a=A()

# for i in range(3):

#     a.f()

#

# num=2

# def f():

#     num=1

#     print("局域:",num)

#     num+=1

# for i in range(3):

#     f()

#     num+=1

#     print("全局",num)

#

# class A():

#     var=1

#     def f(self):

#         self.var+=1

#         print("属性是:",self.var)

# a=A()

# var1=9

# for i in range(3):

#     var1 += 1

#     print("变量是:",var1)

#     a.f()

#

# x = [[12,7,3],

#     [4 ,5,6],

#     [7 ,8,9]]

#

# y= [[5,8,1],

#     [6,7,3],

#     [4,5,9]]

# c=[]

# for i in range(3):

#     b=[]

#     for j in range(3):

#         b.append(x[i][j]+y[i][j])

#     c.append(b)

# print(c)

#

# a=[i for i in range(1,101)]

# print(sum(a))

# def f(n):

#     print((n*(n+1)/2))

# f(100)

#

# while True:

#     a=int(input("输入某数:"))

#     if a**2<=50:

#         break

#     else:

#         print("和:",a**2)

#

# def f():

#     a=input("一:")

#     b=input("二:")

#     c=a

#     a=b

#     b=c

#     print("一:",a)

#     print("二:",b)

# f()

#

# def f():

#     a=int(input("一:"))

#     b=int(input("二:"))

#     if a==b:

#         print("%d=%d"%(a,b))

#     elif a>b:

#         print("%d>%d"%(a,b))

#     else:

#         print("%d<%d"%(a,b))

# f()

#

# a=[lambda:[x for x in range(10)]]

# b=[x for x in range(10)]

# list2=[1,4,6,-3,-9,-2]

# print(sorted(c,key=lambda x:abs(x)))

# print(list(map(lambda x:x+1,c)))

# print(list(filter(lambda x: x%2==0,c)))

# print(sorted(c,key=lambda x:x["time"]))

# def f(a,b):

#     return lambda x:a*x+b

# z=f(3,3)

# print(z(4))

#

# import random

# a_rand=random.randint(0,19)

# print(a_rand)

#

#位运算符，按照二进制进行计算

#

#

#

#

#

#

#

#

# def f():

#     for i in range(100,1000):

#         i_3=i//100

#         i_2=i//10%10

#         i_1=i%10

#         print("{},{},{}".format(i_3,i_2,i_1))

# f()

#

# def f():

#     k=0

#     str_=input("输入:")

#     print(len(str_))

#     for i in str_:

#         k+=1

#     print(k)

# f()

#

# b=[[1],]

# for i in range(0,5):

#     c=[]

#     for j in range(0,i+1):

#         if j==0:

#             c.append(b[i][j])

#         if j<=i-1:

#             c.append(b[i][j]+b[i][j+1])

#     c.append(1)

#     b.append(c)

# print(b)

# for i in b:

#     for k in i:

#         print(k,end=" ")

#     print()

# print(b)

# b=[]

# for i in range(0,5):

#     c=[]

#     for j in range(0,i):

#         if j==0:

#             c.append(b[i-1][j])

#         if j<=i-2:

#             c.append(b[i-1][j]+b[i-1][j+1])

#     c.append(1)

#     b.append(c)

# print(b)

# for i in b:

#     for k in i:

#         print(k,end=" ")

#     print()

# print(b)

#

# def f():

#     a=input("字符串1:")

#     b=input("字符串2:")

#     print(a.find(b))

# f()

#

#

#

#

# def f():

#     d=[]

#     a=int(input("a:"))

#     b=int(input("b:"))

#     c=int(input("c:"))

#     d.extend([a,b,c])

#     d.sort(reverse=True)

#     print(d)

# f()

#

# def f():

#     c=[]

#     for i in range(6):

#         a=int(input("输入数字:"))

#         c.append(a)

#     c1 = c

#     print(c)

#     for i_1 in range(6):

#         for i_2 in range(i_1,6):

#             if c1[i_1]<=c1[i_2]:

#                 k=c1[i_1]

#                 c1[i_1]=c1[i_2]

#                 c1[i_2]=k

#     max_=c.index(c1[0])

#     min_=c.index(c1[5])

#     max_1=c[0]

#     c[0]=c[max_]

#     c[max_]=max_1

#

#     min_1 = c[5]

#     c[5] = c[min_]

#     c[min_] = min_1

#     print(c)

# f()

#

# def f(m,n):

#     c=[]

#     b=[]

#     for i in range(m):

#         a=input("输入:")

#         c.append(a)

#     for i in range(n,m):

#         b.append(c[i])

#     for i in range(n):

#         b.append(c[i])

#     print(b)

# f(8,4)

#

# def people_3(a):

#     j=0

#     list_a=[x for x in range(1,a+1)]

#     i=0

#     while i<len(list_a):

#         j+=1

#         if j==3:

#             list_a.remove(list_a[i])

#             j=0

#             i-=1

#         if i==len(list_a)-1:

#             i=-1

#         i+=1

#         if len(list_a)==1:

#             print(list_a)

#             break

# people_3(4)

#

# if __name__=="__main__":

#     a=input("输入:")

#     print(len(a))

#

# d = {}

# def write():

#     print(type(d))

#     for i in range(5-len(d)):

#         a=input("输入键名:")

#         if a == "0":

#             break

#         b=input("输入键值:")

#         # d.update({a:b})

#         d.update([(a,b)])

#     print(d)

# def read():

#     a = input("输入键名:")

#     for key,value in d.items():

#         if a==key:

#             print(key,":",value)

# write()

# read()

# a={"q":1,"w":"2"}

# for key,value in a.items():

#     if "w"==key:

#         print(key,":",value)

#

# def f():

#     c=[]

#     for i in range(3):

#         a=int(input("输入:"))

#         c.append(a)

#     print(c)

# f()

#

# def f():

#     a=input("输入")

#     len_a=len(a)

#     for i in range(len_a):

#         print(a[len_a-i-1],end="")

# f()

#

# def f():

#     a=list(input("输入:"))

#     b=list(input("输入:"))

#     a.sort()

#     b.sort()

#     print(a+b)

# f()

#

# for i in range(5):

#     n = 0

#     if i != 1: n += 1

#     if i == 3: n += 1

#     if i == 4: n += 1

#     if i != 4: n += 1

#     if n == 3: print(64 + i)

#

# def f(a):

#     sum_a=0

#     if a%2==0:

#         for i in range(1,a//2+1):

#             sum_a+=(1/(2*i))

#     else:

#         for i in range(1,a//2+1):

#             sum_a+=1/2*i+1

#     print(sum_a)

# f(6)

#

# def f():

#     a=list(input())

#     for i in a:

#         print(i,end="")

# f()

#

# def f():

#     dic={'a':1,'f':2,'c':3,'h':0}

#     sorted(dic.items(),key=lambda x:x[1])

#     print(dic)

# f()

# a={"001":{"name":"张三","age":12},

#         "002":{"name":"李四","age":22},

#         "003": {"name": "王二", "age": 19}}

#

# def f():

#     a=input("")

#     b=input("")

#     c=input("")

#     if a>b :  a,b=b,a

#     if a>c:   a,c=c,a

#     if b>c:   b,c=c,b

#     print(a,b,c)

# f()

#

# def f():

#     for i in range(3120,4000):

#         flag = 1

#         k=i

#         for j in range(5):

#             if i%5==1:

#                 i=(i//5)*4

#             else:

#                 flag=-1

#                 break

#         if flag==1:

#             print(k)

# f()

#81:

# def f():

#     a=809

#     for i in range(10,100):

#         if (a*i==800*i+9*i) and (9000<a*i<10000):

#             print(a*i)

# f()

#

# def f(a):

#     c=[]

#     while True:

#         x1=a//8

#         x2=a%8

#         c.append(x2)

#         a=x1

#         if x1<8:

#             c.append(x1)

#             break

#     for i in range(len(c)):

#         print(c[len(c)-i-1],end="")

# f(28)

#

# def f():

#     for i in range(0,7):

#         if i==0:

#             print("4")

#         elif i == 1:

#             print("28")

#         else:

#             print(7*(8**(i-1))*4)

# f()

#

# def f(a):

#     c=[]

#     for i in range(a):

#         b=input("")

#         c.append(b)

#     print("--".join(c))

# f(3)

#

# def f():

#     a=int(input("输入奇数:"))

#     for i in range(1,10):

#         z = 0

#         for j in range(0,i):

#             z+=9*(10**j)

#         # print(z)

#         if z%a==0:

#             print(z)

#             break

# f()

#

# def f():

#     a=input("字符串:")

#     b = input("字符串:")

#     print("{}-{}".format(a,b))

#     print(a+b)

#     print("-".join(a))

# f()

#

# class A():

#     var=1

#     var2="a"

#     def f(self,c):

#         c.var=3

#         c.var2="c"

# a=A()

# a.var=10

# a.var2="asd"

# a.f(a)

# print(a.var)

# print(a.var2)

#

# a=int(input("一:"))

# print(a*"*")

#

# def f():

#     a=input("")

#     a=list(a)

#     c=[]

#     for i in a:

#         i=(int(i)+5)%10

#         c.append(i)

#     print(c)

#     c[0],c[3]=c[3],c[0]

#     c[1],c[2]=c[2],c[1]

#     print(c)

# f()

#

# list.append()

# list.extend([])

# list.insert(index,num)

# list.remove()

# list.pop()

# del list()

# list.index()

# list.count()

# list.sort()

# sorted(list,lambda x:)

#

#time模块

#

# import time

# def f():

#     start=time.time()

#     time.sleep(1)

#     end=time.time()

#     print(end-start)

# f()

#

#

#

#

# def f():

#     a=input()

#     b=input()

#     print(a.count(b))

# f()

#

# def f():

#     a=input()

#     for i in a:

#         if i!="#":

#             print(i,end="")

#         else:

#             break

# f()

#

# def f():

#     a=input()

#     a=a.upper()

#     with open(r"C:\Users\Administrator\Desktop\1.txt","w") as f:

#         f.write(a)

# f()

#

# with open (r"C:\Users\Administrator\Desktop\1.txt","r") as f1:

#     cont1=f1.read()

# with open(r"C:\Users\Administrator\Desktop\2.txt", "r") as f2:

#     cont2=f2.read()

#     l=list(cont1+cont2)

#     l.sort()

#     print(l)

#     s="-".join(l)

#     print(s)

# with open(r"C:\Users\Administrator\Desktop\3.txt", "w") as f3:

#     f3.write(str(s))

#

# def f():

#     a=list(input())

#     b=list(input())

#     c=dict(zip(a,b))

#     print(c)

# f()

# i = ['a', 'b']

# l = [1, 2]

# a=dict([i,l])

# print (a)

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