DataFrame 數據去重

df.head()
>>>
Price	Seqno	Symbol	time
0	1623.0	0.0	APPL	1473411962
1	1623.0	0.0	APPL	1473411962
2	1623.0	0.0	APPL	1473411963
3	1623.0	0.0	APPL	1473411963
4	1649.0	1.0	APPL	1473411963

df.drop_duplicates(["Seqno"],keep="last").head()
>>>
	Price	Seqno	Symbol	time
3	1623.0	0.0	APPL	1473411963
7	1649.0	1.0	APPL	1473411964
11	1642.0	2.0	APPL	1473411965
15	1636.0	3.0	APPL	1473411966
19	1669.0	4.0	APPL	1473411967

df.drop_duplicates(subset=None, keep='first', inplace=False)

1 data.drop_duplicates()#data中一行元素全部相同時才去除

2 data.drop_duplicates(['a','b'])#data根據’a','b'組合列刪除重復項，默認保留第一個出現的值組合。傳入參數keep='last'則保留最后一個