打印三角形图案

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row = int(input('请输入行数: '))
for i in range(row):
    for _ in range(i + 1):
        print('*', end='')
    print()
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*
**
***
****
*****
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for i in range(row):
    for j in range(row):
        if j < row - i - 1:
            print(' ', end='')
        else:
            print('*', end='')
    print()
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    *
   **
  ***
 ****
*****
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for i in range(row):
    for _ in range(row - i - 1):
        print(' ', end='')
    for _ in range(2 * i + 1):
        print('*', end='')
    print()
````

*