练习记录总结~

"""给一个半径，求周长面积"""

pi = 3.14
radii = int(input('>>>'))
print('周长:',2 * pi * radii)
print('面积:',(pi * radii)**2)

 

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"""输入两个数，比较大小，升序打印"""

first = int(input('>>>'))
second = int(input('>>>'))
if first < second:
    print(first,second)
else:
    print(second,first)

 

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"""输入若干个数，打印最大值，如果为空则退出"""

number = 0
while True:
    numbers = input('>>>')
    if numbers:
        numbers = int(numbers)
        if numbers > number:
            number = numbers
    else:
        break
print(number)

 

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"""输入若干个数，求每次输入后的平均数"""

count = 0
num = 0
while True:
    number = input('>>>')
    if number:
        num += int(number)
        count +=1
        print(num / count)
    else:
        break

 

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"""打印一个边长为N的正方形"""

n = int(input('>>>'))
for i in range(n):
    if i==0 or i == (n-1):
        print('* ' * n)
    else:      
        print('*' + ' '* (n*2-3)+ '*')

 

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"""求100以内所有奇数的和（2500）"""

num = 0
for i in range(1,100,2):
    num += i
print(num)

 

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"""判断成绩"""

num = int(input('>>>'))
if num >= 80:
    if num >=90:
        print('A')
    else:
        print('B')
else:
    if num >= 70:
        print('C')
    elif num >= 60:
        print('D')
    else:
        print('E')

 

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"""求1到5的乘阶之和"""

num = 1
sum = 0
# for i in range(1,2):
for j in range(1,6): 
    num *= j 
    sum += num
print(sum)
print('--------------')

 

 

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"""判断素数"""

n = int(input(">>>"))
for i in range(2,n):
    if  n % i == 0:
        print('不是')
        break
    else:
        print('是')
        break

 

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"""打印九九乘法表"""

for i in range(1,10):
    for j in range(1,i+1):
        print(str(j) + ' * '+ str(i),'=',j*i,end='\t')
    print()

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"""打印菱形"""

for i in range(-3,4):
if i <= 0:
　　print(' ' * -i +'*' * (7+i*2)) # 1 3 5 7 5 3 1
else: #3 -2 -1 0 1 2 3
　　print(' ' * i + '*' * (7-i*2)) #4 5 6 7 6 5 4

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"""打印100以内的斐波那契数列"""

a = 0
b = 1
for i in range(101):
    c = a + b
    a,b = b,c
print(a)

 

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"""输入三个数，用if判断大小"""

a = input('>>>')
b = input('>>>')
c = input('>>>')

if a > b:
    if b > c:
        print(a,b,c)
    else:  #c > b
        if a > c:
            print(a,c,b)
        else:
            print(c,a,b)
else:
    if a > c:
        print(b,a,c)
    else:
        if b > c:
            print(b,c,a)
        else:
            print(c,b,a)

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"""冒泡排序法"""

nums = [3,5,7,9,8,2,1,4,6]

length = len(nums)

for i in range(length - 1):
    flag = False
    for j in range(length -i -1):
        if nums[j] > nums[j+1]:
            nums[j], nums[j+1] = nums[j+1],nums[j]
            flag = True
    if not flag:
        break
print(nums)

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"""九九乘法表"""
for i in range(1,10):
    line = ''
    for j in range(1,i+1):
        line += '{} * {} = {:<{}}'.format(j,i,i*j)
    print(line)

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for i in range(1,10):
    for j in range(1,i+1):
        print('{} * {} = {:<{}}'.format(j,i,i*j,5 if j == 1 else 6),end= '\n' if i == j else '')  

for i in range(1,10):
    line = ''
    for j in range(i,10):
        line += ('{} * {} = {:<3} '.format(i,j,i*j))
    print('{:>110}'.format(line))

for i in range(1,10):
    line = ''
    print('\n' + '\t'* (i-1),end='')
    for j in range(i,10):    
        print('{}*{}={}\t'.format(j,i,i*j),end='')

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"""对顶三角形"""
for i in range(-3,4):
    print(' '* (3-abs(i)) + (abs(i)*2+1) * '*')
    

 

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"""打印闪电"""

n = 7
e = 7 // 2
for i in range(-e,e+1):
    if i < 0:
        print(' '* (-i) + (4 + i) * '*')
    elif i == 0:
        print('*' * n)
    else:
        print(' ' * e + (4-i)*'*')

 

 

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"""猴子吃桃问题"""
a = 1
for i in range(9):
    a = (a+1)*2
print(a)

 

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"""求十万以内的素数"""
import datetime
count = 1
start = datetime.datetime.now()
for i in range(3,100000,2):
    if i > 5 and i % 5 == 0: continue
    for j in range(3,int(i**0.5+1),2):      
        if i % j== 0:
            break
    else:
        #print(i)
        count += 1
delta = (datetime.datetime.now()-start).total_seconds()
print(delta,count)

 

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# """杨辉三角"""
nums = [[1],[1,1]]
for i in range(1,5):
    nums.append([1])
    for j in range(i):
        nums[i+1].append(nums[i][j] + nums[i][j+1])
    nums[i+1].append(1)
print(nums)