如果 3 个连续数字，则为 Pandas 数据框

Question

I have a dataframe df我有一个数据框df

I wanted to make a column which says TRUE if there are 2 positive numbers in a row如果一行中有 2 个正数，我想创建一列表示TRUE

So the output is所以输出是

    Price    output
0    3        FALSE
1    3        TRUE
2    3        TRUE
3    -3       FALSE
4    3        FALSE
5    3        TRUE

Answer 1

Use .shift(1) to look at the value in the previous row:使用.shift(1)查看前一行的值：

df['two_positive'] = (df['Price'] >= 0) & (df['Price'].shift(1) >= 0)

Result:结果：

    Price   two_positive
0   3       False
1   3       True
2   3       True
3   -3      False
4   3       False
5   3       True