[Python知识库]万忠教Python的几个程序练习

1、$n!$

a = eval(input("输入一个要计算阶乘的数"))
n = 1
if a == 0:
    n = 0
for i in range(1,a+1):
    n *= i
print("{}!={}".format(a,n))

2、$1!+2!+3!???n!$

k = eval(input("请输入计算阶乘的数值："))
sum1 = 0
if k == 0:
    sum1 = 1
for i in range(1,k+1):
    t = 1
    for j in range(1,i+1):
        t *= j
    sum1 += t
print(sum1)

3、$1+2+3+???+100$

n = 0
for i in range(101):
    n += i
print(n)

4、$1?2+3?4+???99?100$

n = 0
for i in range(101):
    if i%2 == 0:
        n -= i
    else:
        n += i
print(n)

5、$1/2+2/3+3/4+???+99/100$

sum1 = 0
for i in range(1,100):
    sum1 += i/(i+1)
print(sum1)

6、$1/2+1/(2?3)+1/(3?4)+???+1/(99?100)$

sum1 = 0
for i in range(1,100):
    sum1 += 1/(i*(i+1))
print(sum1)

7、$1/2?1/(2?3)+1/(3?4)+???+1/(99?100)?1/(100?101)$

sum1 = 0
for i in range(1,100):
    sum1 += 1/(i*(i+1))*(-1)**(i+1)
print(sum1)

8、在2-100之间寻找素数（质数）

num = []
for i in range(2,100):
    for j in range(2,i):
        if(i%j == 0):
            break
    else:
        num.append(i)
print(num)

9、（*）星号矩阵

for i in range(5):
    for j in range(5):
        print("*",end="")
    print()

10、输出如下内容输出

for i in range(4):
    for i in range(1,5):
        print(i,end="")
    print()

11、输出如下内容输出

for i in range(1,5):
    for j in range(4):
        print(i,end="")
    print()

12、输出如下内容输出

for i in range(1,5):
    n = i
    for j in range(4):
        print(n,end=" ")
        n += 4
    print()

13、输出如下内容输出

for i in range(1,5):
    if i%2==1:
        n = 4*i-3
        for j in range(4):
            print(n,end=" ")
            n += 1
        print()
    else:
        n = i*4
        for j in range(4):
            print(n,end=" ")
            n -= 1
        print()

14、实现如下内容输出

for i in range(1,6):
    n =int(i*(i-1)/2+1)
    for j in range(i):
        print(n,end=" ")
        n += 1
    print()

15、实现如下内容输出

for i in range(1,5):
    n = 1
    for j in range(i):
        print(n,end="")
        n += 1
    print()

16、实现如下内容输出

for i in range(1,5):
    for j in range(i):
        print("*",end="")
    print()

a = eval(input("请输入一个数"))
for i in range(1,a+2):
    if i == 1:
        print("*")
    elif i == a+1:
        print("* "*(a+1),end="")
    else:
        print("*",end="")
        print(" "*(i*2-3),end="")
        print("*")

17、实现如下内容输出

a = eval(input("请输入一个数"))
for i in range(1,a+1):
    for j in range(i-1):
        print(" ",end="")
    for j in range(a-i+1):
        print("*",end="")
    print()

a = eval(input("请输入一个数"))
for i in range(1,a+1):
    for j in range(i-1):
        print(" ",end="")
    if i==1 or i==a or i==a-1:
        for j in range(a-i+1):
            print("*",end="")
    else:
        print("*",end="")
        print(" "*(a-i-1), end="")
        print("*", end="")
    print()

18、实现如下内容输出

for i in range(4,0,-1):
    for j in range(i):
        print("*",end="")
    print()

a = eval(input("请输入一个数"))
for i in range(a,0,-1):
    if i==a or i==1 or i==2:
        print("*"*i,end="")
    else:
        print("*", end="")
        print(" "*(i-2), end="")
        print("*", end="")
    print()

19、实现如下内容输出

for i in range(4,0,-1):
    for j in range(i-1):
        print(" ",end="")
    for j in range(4-i+1):
        print("*",end="")
    print()

a=eval(input("请输入一个数"))
for i in range(a,0,-1):
    for j in range(i-1):
        print(" ",end="")
    if i==a or i==a-1 or i==1:
        print("*"*(a-i+1), end="")
    else:
        print("*", end="")
        print(" "*(a-i-1), end="")
        print("*", end="")
    print()

20、实现如下内容输出

a=eval(input("请输入一个数"))
for i in range(a,0,-1):
    for j in range(i-1):
        print(" ",end="")
    for j in range(2*a-2*i+1):
        print("*",end="")
    print()

a=eval(input("请输入一个数"))
for i in range(a,0,-1):
    for j in range(i-1):
        print(" ",end="")
    if i==a :
        print("*",end="")
    elif i==1:
        print("*"*(2*a-1),end="")
    else:
        print("*", end="")
        print(" "*(a*2-i*2-1), end="")
        print("*", end="")
    print()

21、实现棱形

链接: 实心和空心棱形.