.duplicated / .replace
1--# 去重复
X.duplicated()
布尔型索引:X[X.duplicated()== False ]
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2--# 去重复方法2
s.drop_duplicates()
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3--# Dataframe中使用duplicated
df [ 'v1' ].drop_duplicates()
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3--!!!!!# 替换 .replace
.replace( 'a' , 'xxxxx') 1个原值 替换成 1个值
.replace( [ 'a', 'b' ],'xxxx' ) n个原值 替换成 1个值
.replace({ ‘a’ : 'x1x1x1' , 'b' : 'x2x2x2'}) n个原值 替换成 n个值
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