loop 10 question answer

第一題

result = ''

for i in range(9):
    for j in range(9):
        if i == j:
            result += "＊"
        else:
            result += "．"
    result += '\n'

print(result)

第二題

result = ''

for i in range(9):
    for j in range(9):
        if i in (0, 8) or j in (0, 8):
            result += "＊"
        else:
            result += "．"
    result += '\n'

print(result)

第三題

result = ''

for i in range(9):
    for j in range(9):
        if i == 4 or j == 4:
            result += "＊"
        else:
            result += "．"
    result += '\n'

print(result)

第四題

for i in range(9):
    for j in range(9):
        if i < 5:
            print('＊',end='')
        else:
            print('．',end='')

    print()

第五題

result = ''

for i in range(9):
    for j in range(9):
        if i < 5 and j < 5:
            result += "＊"
        else:
            result += "．"
    result += '\n'

print(result)

第六題

result = ''

for i in range(8,-1,-1):
    for j in range(9):
        if i == j:
            result += "＊"
        else:
            result += "．"
    result += '\n'

print(result)

第七題

result = ''

for i in range(9):
    for j in range(9):
        if (i + j) % 2 == 0:
            result += "＊"
        else:
            result += "．"
    result += '\n'

print(result)

第八題

for i in range(9):
    for j in range(9):
        if (i + j) % 4 == 0:
            print('＊', end='')
        else:
            print('．', end='')
    print()

第九題

result = ''

for i in range(8,-1,-1):
    for j in range(9):
        if (i + j) % 4 == 0:
            result += "＊"
        else:
            result += "．"
    result += '\n'

print(result)

第十題

result = ''

for i in range(9):
    for j in range(9):
        if i <= j:
            result += "＊"
        else:
            result += "．"
    result += '\n'

print(result)