练习

1.斐波那契数列

n = 8
n_1 = n_2 = result = 1
for x in range(3,n+1):
    result = n_1 + n_2
    n_2 = n_1
    n_1 = result
print(result)

2.求100~200中间的素数

print('___________________')
sum1 = 0
for x in range(100,201):
    count = 0
    for y in range(2,x):
        if x % y == 0:
            count += 1
            break
    if count == 0:
        print(x)
        sum1 += 1
print('个数',sum1)

4.

fz = 2
fm = 1
for _ in range(20):
    # print('%d/%d'%(fz,fm))
    fz,fm = fz+fm,fz  #fz,fm = 3,2    fz = 3, fm = 2
print('%d/%d'%(fz,fm))

5.

num = 12343543
count = 0
while num != 0:
    count += 1
    print(num%10)
    num //=10
print(count)

day6 - 作业

1.

age = 30
if 0<age<=6:
print('幼儿')
elif 7<age<=12:
print('儿童')
elif 13<age<=24:
print('青年')
elif 25<age<=50:
print('中年')
else:
print('老年')
结果：

1.JPG

2.

print('______________')
num = 1
for x in range(1,6):
    num *= x
print(num)

结果：

2.JPG

3.

print('3———————————————————————')
num = 1
sum1 = 0
for x in range(1,21):
    num *= x
    sum1 += num
print(sum1)

结果

3.JPG

4.

num = 1
sum1 = 0
for x in range(1,21):
    num *= x
    sum1 += 1/num
print(sum1)

结果：

4.JPG

5.

num = input('请输入一个大于0的数字(输入0结束):')
num = int(num)
sum1 = 0
while num != 0:
    sum1 += num
    num = input('请输入一个大于0的数字(输入0结束):')
    num = int(num)
print('输入数字的和为：',sum1)

结果

5.JPG

6.

a = int(input('请输入a的值'))
n = int(input('请输入次数'))
m = 0
num = 0
sum1 = 0
sum2 = 0
while m < n:
    while m < n:
        num = a*10**m
        sum1 += num
        m += 1
        print(sum1)
        sum2 += sum1
    m += 1
print('和：',sum2)

结果：

6.JPG
7.JPG

7.

a = int(input('输入第一个整数：'))
b = int(input('输入第二个整数：'))
c = int(input('输入第三个整数：'))
if a > b:
    t = a
    a = b
    b = t
if b > c:
    t = b
    b = c
    c = t
if a > b:
    t = a
    a = b
    b = t
print(a,b,c)

结果：

8.JPG

8.

a.

n = 5
while n > 0:
    # print('*')
    m = n
    while m > 0:
        print('*',end = '')
        m -= 1
    n -= 1
    print('\n')

结果：

9.JPG

n = 4
while n > 0:
    # print('*')
    m = n
    while m > 0:
        print('*',end = '')
        m -= 1
    n -= 1
    print('\n')

结果

10.JPG

b.