巴斯卡三角形 in Python

Source Code

def print_pascal(row_cnt):
    pascal = []
    for row in range(row_cnt):
        cols = []
        for col in range(row+1):
            if row == 0:
                cols.append(1)
            elif col == 0 or col == row:
                cols.append(1)
            else:
                val = pascal[row-1][col-1]+pascal[row-1][col];
                cols.append(val)
        pascal.append(cols)
    for row in pascal:
        for i in range(row_cnt-len(row)):
            print('%5s' %'',end='')
        for col in row:
            print('%5d' %col,end='%5s' %'')
        print()

Usage

>>> print_pascal(6)
                             1     
                        1         1     
                   1         2         1     
              1         3         3         1     
         1         4         6         4         1     
    1         5        10        10         5         1