Python：每日一题 202

冬雪雪冬 · 发表于 2018-8-23 20:34:06

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本帖最后由冬雪雪冬于 2018-8-26 20:55 编辑

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题目：
随机生成一个由8位的数字组成的字符串，要求各位数字之和等于40。
例如：
54735781
01496488
27392296
......
======================================
本题主要是考察程序的执行效率，如果直接生成8个数字，再看是否之和为40，会做很多无用功。

凌九霄 · 发表于 2018-8-23 20:53:46

本帖最后由凌九霄于 2018-8-27 16:47 编辑

import random
while True:
nums = [ random.randint(0, 9) for i in range(8) ]
if sum(nums) == 40:
print(''.join(map(str, nums)), sum(nums))
break

复制代码

import random
while True:
nums = random.sample('0123456789' * 8, 8)
if sum(map(int, nums))== 40:
print(''.join(nums))
break

复制代码

稍改下，来个效率高的

import random
nums = [ random.randint(5, 9) for i in range(8) ]
if sum(nums) >= 40:
x = sum(nums) - 40
while x:
i = random.randint(0, 7)
if nums[ i ] > 0:
nums[ i ] -= 1
x -= 1
print(''.join(map(str, nums)), sum(nums))

复制代码

塔利班 · 发表于 2018-8-23 21:43:36

本帖最后由塔利班于 2018-8-23 21:44 编辑

from random import *
def fun202():
a=[0]*8
s=40
while s:
for i in range(8):
if s>9-a[i]:
t=randint(0,9-a[i])
else:
t=randint(0,s)
s-=t
a[i]+=t
return ''.join(map(str,a))

复制代码

JessiFly · 发表于 2018-8-23 22:56:08

import random as r
def fun202(length=8,total=40):
while True:
list1 = []
totals = 0
for i in range(length):
temp = r.randint(0,9)
totals += temp
list1.append(str(temp))
if totals == total:
return ''.join(list1)
if __name__ == '__main__':
print(fun202())

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天圆突破 · 发表于 2018-8-23 23:04:21

本帖最后由天圆突破于 2018-8-24 14:59 编辑

from random import randint
from functools import reduce
class Func201:
def __init__(self,n):
self.n = n
def __iter__(self):
return self
def __next__(self):
while True:
lst = [randint(0, 9) for i in range(self.n)]
if reduce(lambda x, y: x + y, lst) == 40 and int(''.join(map(lambda x: str(x), lst))) > 9999999:
return int(''.join(map(lambda x: str(x), lst)))
if __name__ == '__main__':
f = Func201(8)
while True:
print(next(f))
input(">>: press any key to continue")

复制代码

ErTian · 发表于 2018-8-24 01:04:19

import random

def test202():
temp = [0,0,0,0,0,0,0,0]
while sum(temp)/8 != 5:
      for j in range(8):
         temp[j]=random.randint(0,9)
for m in range(8):
      temp[m]=str(temp[m])
return ''.join(temp)

chongchuigu · 发表于 2018-8-24 09:31:34

本帖最后由 chongchuigu 于 2018-8-24 09:32 编辑

import random
n=random.randint(10000000,99993999)
j=0
for i in range(n,99994001):
s=i
while s:
j+=s%10
s=s//10
if j==40:
print(str(i))
break
j=0

复制代码

大头目 · 发表于 2018-8-24 09:57:30

import random
def output40():
a1 = random.randint(0,9)
a2 = random.randint(0,9)
a3 = random.randint(0,9)
a4 = random.randint(0,9)
a5 = random.randint(0,9)
a6 = random.randint(0,9)
a7 = random.randint(0,9)
a8 = random.randint(0,9)
while a1+a2+a3+a4+a5+a6+a7+a8 != 40:
a1 = random.randint(0,9)
a2 = random.randint(0,9)
a3 = random.randint(0,9)
a4 = random.randint(0,9)
a5 = random.randint(0,9)
a6 = random.randint(0,9)
a7 = random.randint(0,9)
a8 = random.randint(0,9)
z = str(a1)+str(a2)+str(a3)+str(a4)+str(a5)+str(a6)+str(a7)+str(a8)
print(z)
for i in range(10):
output40()
#感觉自己的程序越来越粗糙了……

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llok4 · 发表于 2018-8-24 10:16:47

import random
running=True
while running:
num=random.randint(10000000,99999999)
str_num=str(num)
list_num=[]
for each in str_num:
each=int(each)
list_num.append(each)
if sum(list_num)==40:
running=False
print(num)

复制代码

zhou995287902 · 发表于 2018-8-24 10:47:30

import random
while True:
result=''
num=0
for i in range(8):
i=random.randint(0,9)
num+=i
result+=str(i)
if num==40:
print(result)

复制代码

晓屁屁 · 发表于 2018-8-24 10:48:21

import random,sys
while 1:
a = random.randint(10000000, 99999999)
b = 0
for i in str(a):
b += int(i)
if b == 40:
print(a)
sys.exit()

复制代码

graceasyi · 发表于 2018-8-24 10:49:38

本帖最后由 graceasyi 于 2018-8-24 11:30 编辑

此方法有局限。

import random
def fun202():
d8 = random.choices(range(0, 10), k=8)
while sum(d8) != 40:
d8 = random.choices(range(0, 10), k=8)
return ''.join([str(d) for d in d8])
print(fun202())

复制代码

a641743376 · 发表于 2018-8-24 11:08:04

本帖最后由 a641743376 于 2018-8-24 11:09 编辑

import random

while True:
list1=['0','1','2','3','4','5','6','7','8','9']
strings=''
nums=0
for i in range(8):
      strings+=random.choice(list1)
for j in strings:
      nums+=int(j)
if nums==40:
      print(strings)
      break

lan3580884 · 发表于 2018-8-24 11:10:44

from random import *
def creat_num() :
flag = True
while flag:
      k = randint(10000000,99999999)
      a = list(str(k))
      b = [int(i) for i in a]
      if sum(b)== 40:
         print (k)
         flag = False
if __name__ == '__main__':
creat_num()

祥哥威武 · 发表于 2018-8-24 11:46:54

import random
def getNumber():
list0 = []
for i in range(8):
num0 = random.randint(0,9)
list0.append(str(num0))
if eval("+".join(list0)) != 40:
getNumber()
else:
print("".join(list0))
getNumber()

复制代码

拉了盏灯 · 发表于 2018-8-24 11:49:51

本帖最后由拉了盏灯于 2018-8-24 15:48 编辑

def fun202():
l = []
for i in range(4):
num =random.randint(5,9)
l.append(num)
while len(l) < 8:
num = random.randint(0,9)
if sum(l)+num <= 40 and len(l) < 8:
if 40 - sum(l) > num and 40 - sum(l) < (7-len(l))*9+num:
l.append(num)
random.shuffle(l)
else:
l.append(40-sum(l))
return ''.join(map(str,l)

复制代码

子沙 · 发表于 2018-8-24 12:58:36

本帖最后由子沙于 2018-8-24 13:01 编辑

import random
def fun_202(times):
i=1
a=[0]*8
while i<=times:
while True:
for j in range(0,7):
a[j]=random.randrange(0,10)
if sum(a[:7])>30 and sum(a[:7])<=40:
a[7]=40-sum(a[:7])
string=''
for k in range(8):
string+=str(a[k])
print(string)
break
i+=1
fun_202(10)

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xyl20180824 · 发表于 2018-8-24 12:59:20

本帖最后由 xyl20180824 于 2018-8-24 13:02 编辑

import random
def  result():
res = ''
numres = 0
for num in range(9):
      i = int(10*random.random())
      numres += i
      num = str(i)
      res += num
if(numres == 40):
      print(res)
else:
      result()

if __name__ == '__main__':
result()

骨傲天 · 发表于 2018-8-24 13:24:23

import random
while 1:
x=0
z=''
for i in range(8):
      y=random.randint(0,9)
      z+=str(y)
      x+=y

if x==40:
      print(int(z))
      break

Wangzy1025 · 发表于 2018-8-24 14:28:34

本帖最后由 Wangzy1025 于 2018-8-24 14:34 编辑

import random as r
def fun202():
while True:
n = r.randint(10000000, 99999999)
if sum([int(x) for x in str(n)]) == 40:
return str(n)
def fun202_2():
while True:
temp_list = []
for i in range(7):
if sum(temp_list) <= 40:
temp_list.append(r.randint(0, 9))
else:
temp_list = []
break
if 30 < sum(temp_list) <= 40:
temp_list.append(40 - sum(temp_list))
return ''.join([str(x) for x in temp_list])
else:
continue
print(fun202())
print(fun202_2())

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