num = int(input("Enter a number >>>:"))
a = num + 1
for i in range(1,a):
    if i == 1 or i == (a-1):
        print("#\t"*(a-1))
    else:
        print("#"+(" \t" * (a-2))+"#\t")

num = int(input(">>>："))

for i in range(num,0,-1):
    print((num - i)*"#\t"+i*"#\t")

num = int(input(">>>"))

for i in range(num):
    print("#\t"*num)
    print("\t")

2.打印1-100內所有奇數之和：

sum = 0

for i in range(1,101,2):
    sum += i
else:
    print(sum)

sum = 0
i = 0
while sum <= 100:
    if sum % 2 != 0:
        i = sum + i
    sum += 1
else:
    print(i)

打印1-100內所有正整數之和：

sum = 0
i = 0
while sum <= 100:
    i = sum + i
    sum += 1
print(i)

幾道基礎知識練習題