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pandas选择数据df[] python切片
![选择数据 - df[] - python切片](/_next/image?url=https%3A%2F%2Fbookchips.com%2Fchips%2F6850eb130b9569655f1202fe%2F%E9%80%89%E6%8B%A9%E6%95%B0%E6%8D%AE-df%5B%5D-python%E5%88%87%E7%89%87.png&w=3840&q=85)
python 切片 pd.DataFrame
import numpy as npimport pandas as pddf = pd.DataFrame(data=[{"A":"1", "B":"3"}, {"A":"3", "B":"2"}, {"A":"2", "B":"1"}])df = pd.DataFrame(data=[{"A":1, "B":3}, {"A":3, "B":2}, {"A":2, "B":1}])
| A | B | |
|---|---|---|
| 0 | 1 | 3 |
| 1 | 3 | 2 |
| 2 | 2 | 1 |
把df看作列表df的索引看作list的索引在这步之前你可能需要获得df索引，看获得数据值索引df[index_1:index_2]
df2 = df[0:1]print(df2)
| A | B | |
|---|---|---|
| 0 | 1 | 3 |
df2 = df[0:2]print(df2)
| A | B | |
|---|---|---|
| 0 | 1 | 3 |
| 1 | 3 | 2 |
