在 pandas.DataFrame，添加一行

>df = DataFrame(columns=('lib', 'qty1', 'qty2'))
 for i in range(5):
 df.loc[i] = [randint(-1,1) for n in range(3)]

>print(df)
 lib qty1 qty2
0 0 0 -1
1 -1 -1 1
2 1 -1 1
3 0 0 0
4 1 -1 -1

[5 rows x 3 columns]

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