选择数据 - df[] - python切片

python 切片 pd.DataFrame

import numpy as np
import pandas as pd
df = 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}])

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)

df2 = df[0:2]
print(df2)