error原因inconsistent use of tabs and spaces in indentation

请问这个错误是什么问题

import time

start_time = time.time()

x = 99
list1 = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9']

q = 0
for i in range(0, x+1, 1):
    print(' ' * (x - i), end='')
    for j in range(i):
        if q > 9:
            q = 0
        if j == i-1:
            print(q, end='')
        else:
            print(q, end=' ')
        q = q + 1
    print()

for k in range(0, x-1, 1):
    print(' ' * (k+1), end='')
    for j in range(x-j-1):
        if q > 9:
            q = 0
        if j == i-1:
            print(q, end='')
        else:
            print(q, end=' ')
        q = q + 1
    print()

end_time = time.time()
print(end_time - start_time)

import time

start_time = time.time()
x = 9
list1 = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9']
q = 0
for i in range(0, x + 1, 1):
    print(' ' * (x - i), end='')
    for j in range(i):
        if q > 9:
            q = 0
        if j == i - 1:
            print(q, end='')
        else:
            print(q, end=' ')
        q = q + 1
    print()
for i in range(0, x - 1, 1):
    print(' ' * (i + 1), end='')
    for j in range(x - i - 1):
        if q > 9:
            q = 0
        if j == x - i - 1:
            print(q, end='')
        else:
            print(q, end=' ')
        q = q + 1
    print()
end_time = time.time()
print(end_time - start_time)

你同时使用了tab键和空格键来控制缩进导致的。