索引操作
- 需要注意的是,pandas对应的Dataframe对象不符合ndarray中的 先行再列 进行元素的获取,而是遵循先列后行
- 但可以使用df.loc(字符索引)和df.iloc(下标索引)进行df的索引操作
数据集:
语文 | 数学 | 英语 | |
---|---|---|---|
小明 | 48 | 80 | 40 |
小红 | 93 | 84 | 48 |
小王 | 73 | 88 | 78 |
小张 | 92 | 47 | 77 |
小李 | 68 | 60 | 82 |
字符索引(遵循先列后行)
单个元素索引
score['语文']['小明']
>>>
48
切片索引(闭区间,":" 两边都包括)
score.loc['小明':'小王',"语文":"数学"]
>>>
语文 数学
小明 48 80
小红 93 84
小王 73 88
下标索引
score.iloc[0:3,0:2]
>>>
语文 数学
小明 48 80
小红 93 84
小王 73 88
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