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python经典练习题之九九乘法表、打印菱形、打印对顶三角形、斐波拉契数列、素数

  • 2026-02-06 12:18:14
python经典练习题之九九乘法表、打印菱形、打印对顶三角形、斐波拉契数列、素数

学学习简单的练习,学到后面会有越来越多的解法来写!

作业的目的是为了让大家熟悉程序语言,锻炼将思路转换成程序逻辑。

九九乘法表

help(print)

先思考能不能打印出方阵

# 1 方阵

# 1 方阵for i inrange(110):    line =''for j inrange(110):        line +=str(i) +'*'+str(j) +'='+str(i*j) +' 'print(line)print('-'*30)

# 2 九九乘法表

for i inrange(110):for j inrange(110):if i >= j:print(str(j) +'*'+str(i) +'='+str(i*j), end=' ')print()print('-'*30)

# 条件合并

for i inrange(110):for j inrange(1, i+1):print(str(j) +'*'+str(i) +'='+str(i*j), end=' ')print()print('-'*30)

# 3 九九乘法表 对齐

for i inrange(110):for j inrange(1, i+1):        product = i * j        product =str(product) +' 'if j >1and product <10elsestr(product)  #这里用表达式(python推荐用)print(str(j) +'*'+str(i) +'='+ product, end=' ')print()print('-'*30)

# 4 九九乘法表 制表符对齐

for i inrange(110):for j inrange(1, i+1):print(str(j) +'*'+str(i) +'='+str(i*j), end='\t')print()print('-'*30)

# 5 使用字符串format方法

for i inrange(110):    line =''for j inrange(1, i+1):        line +='{0}*{1}={2} '.format(j, i, i*j)print(line)print('-'*30)

# 5 对齐

for i inrange(110):    line =''for j inrange(1, i+1):        line +='{0}*{1}={2:<2} '.format(j, i, i*j)print(line)print('-'*30)
  • {2:<2}对应i*j,:<2冒号是分割符号,<表示左对齐,2表示宽度

# 5 对齐改进

for i inrange(110):    line =''for j inrange(1, i+1):        product = i * j        line +='{}*{}={}{}'.format(j, i, product, ' 'if j >1and product <10else' ')print(line)print('-'*30)

# 其它对齐

for i inrange(110): # rowfor j inrange(1, i+1): # column [1, i+1) 1 <= j <= iprint({}*{}={}{}.format(j, i, i*j, ' 'if j==2and i<5else''),            end='\n'if i == j else' ')

扩展题:

1*1=1  1*2=2  1*3=3  1*4=4  1*5=5  1*6=6  1*7=7  1*8=8  1*9=9       2*2=4  2*3=6  2*4=8  2*5=10 2*6=12 2*7=14 2*8=16 2*9=18              3*3=9  3*4=12 3*5=15 3*6=18 3*7=21 3*8=24 3*9=27                     4*4=16 4*5=20 4*6=24 4*7=28 4*8=32 4*9=36                            5*5=25 5*6=30 5*7=35 5*8=40 5*9=45                                   6*6=36 6*7=42 6*8=48 6*9=54                                          7*7=49 7*8=56 7*9=63                                                 8*8=64 8*9=72                                                        9*9=81请打印成上面的形式

# 打印九九乘法表方阵的上半部分

for i inrange(110):    line =''print(' '*7*(i-1), end=''# 前置空格for j inrange(i, 10):        product = i * j        line +='{}*{}={}{}'.format(i, j, product, ' 'if product <10else' ')print(line)

下面采用右对齐方式,且分割均匀

for i inrange(110):    line =''for j inrange(i, 10):        line +='{}*{}={:<{}}'.format(i, j, i * j, 2if j <4else3)print('{:>66}'.format(line))

打印如下菱形

   *  *** ************ *****  ***   *

思路:

看到规律了吗?

for i inrange(-3,4):if i<0:        prespace =-ielse:        prespace = iprint(' '*prespace +'*'*(7-prespace*2))

把if语句改成三元表达式的样子,也可以使用abs(),内建绝对值函数

for i inrange(-34):print(' '*abs(i) +'*'* (7-2*abs(i)))

居中打印

for i inrange(-34):print({:^7}.format('*'*(7-2*abs(i))))

当然菱形也可以居中打印,请自行完成

打印闪电

    *   **  ***********    ***    **    *

分析如下:

行号  *个数  前空格  后空格数  总空格数  数据1       1      3        3         6       -32       2      2        3         5       -23       3      1        3         4       -14       7      0        0         0        05       3      3        1         4        16       2      3        2         5        27       1      3        3         6        3

代码:

for i inrange(-34):if i <0:print(' '* (-i) +'*'* (4+ i))elif i >0:print(' '*3+'*'* (4- i))else:print('*'*7)#延时扩展=9= n //2= n - efor i inrange(-e, x):if i <0:print(' '*-+ (x + i) *'*')elif i >0:print(' '* e + (x - i) *'*')else# i == 0print('*'* n)

斐波那契数列,100以内

斐波那契数列_百度百科

斐波那契数列:1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, ...

如果设F(n)为该数列的第n项(n∈N*),那么这句话可以写成如下形式::F(n)=F(n-1)+F(n-2)

F(0)=0,F(1)=1, F(n)=F(n-1)+F(n-2)

这是一个线性递推数列

print(0)print(1)=0=1whileTrue :    c = a + bif c >100 : break    a = b    b = cprint(c)

求斐波那契数列第101项

=1=1print('index={}, fib={}'.format(00))print('index={}, fib={}'.format(1, a))print('index={}, fib={}'.format(2, b))index =2whileTrue:    c = a + b    index +=1print('index={}, fib={}'.format(index, c))if index ==101break    a = b    b = c# index=101, fib=573147844013817084101

求10万内的所有素数

此题的目的是为了让大家注意效率问题

for x inrange(2,100):for i inrange(2,x):if x % i ==0:breakelse:print(x)

为什么到一个数的“一半”就可以了

for x inrange(2,100000):for i inrange(2,int(x **0.5)+1):if x % i ==0:breakelse:print(x)

下面这段代码是错误代码,用x=4测试,因为内层循环缺少2,那么偶数就出了问题

for x inrange(2,100000):for i inrange(3,int(x **0.5)+1,2):if x % i ==0:breakelse:print(x)

修改为

for x in range(3,100000,2): # 舍弃掉所有偶数    for i in range(3, int(x ** 0.5) + 1, 2): # 为什么从3开始,且step为2?        if x % i == 0:            break        else:            print(x)

为什么从3开始,且step为2?

既然没有偶数,就不用和2取模了。

奇数%偶数能整除吗

利用素数性质:所有大于10的质数中,个位数只有1,3,7,9。

count = 1for x in range(3, 100000, 2): # 舍弃掉所有偶数    if x > 10 and x % 10 == 5: # 所有大于10的质数中,个位数只有1,3,7,9。意思就是大于5,结尾是5就能被5整除了        continue    for i in range(3, int(x ** 0.5) + 1, 2):        if x % i == 0:            break        else:            count += 1            print(x, count) # 9592

如何计算时间,import datetime

count =0for x inrange(2,100000):for i inrange(2,x):if x % i ==0:breakelse:             count +=1print(count)# 9592
count =0for x inrange(2,100000):for i inrange(2,int(x **0.5)+1):if x % i ==0:breakelse:             count +=1print(count)# 9592

应用在密码学领域,都要使用大素数。

# 两种算法的对比的完整代码

importdatetimeupper_limit =100000delta = [0,0]counts = [0,0]start = datetime.datetime.now()for _ inrange(10):    counts[0=0for x inrange(2,upper_limit):for i inrange(2,int(x **0.5)+1):if x % i ==0:breakelse:#print(x)            counts[0+=1delta[0= (datetime.datetime.now() - start).total_seconds()start = datetime.datetime.now()for _ inrange(10):    counts[1=1#print(2)for x inrange(3,upper_limit,2):for i inrange(3,int(x **0.5)+1,2):if x % i ==0:breakelse:#print(x)                counts[1+=1delta[1= (datetime.datetime.now() - start).total_seconds()print(delta, sep=\t)print(counts, sep=\t)

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  1. CONNECT:[ UseTime:0.001090s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001561s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000654s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000637s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001253s ]
  6. SELECT * FROM `set` [ RunTime:0.000522s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001638s ]
  8. SELECT * FROM `article` WHERE `id` = 473902 LIMIT 1 [ RunTime:0.001052s ]
  9. UPDATE `article` SET `lasttime` = 1770442413 WHERE `id` = 473902 [ RunTime:0.017455s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000239s ]
  11. SELECT * FROM `article` WHERE `id` < 473902 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000437s ]
  12. SELECT * FROM `article` WHERE `id` > 473902 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004287s ]
  13. SELECT * FROM `article` WHERE `id` < 473902 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000825s ]
  14. SELECT * FROM `article` WHERE `id` < 473902 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001880s ]
  15. SELECT * FROM `article` WHERE `id` < 473902 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001380s ]
0.190638s