在Pandas中使用衍射SequenceMatcher比率进行合并

Question

我试图找出是否有一种方法来做模糊合并的字符串在潘达基于衍射SequenceMatcher率。基本上，我有两个数据处理程序如下所示：

df_a
company    address        merged
Apple     PO Box 3435       1

df_b
company     address
Apple Inc   PO Box 343

我想像这样合并：

df_c = pd.merge(df_a, df_b, how = 'left', on = (difflib.SequenceMatcher(None, df_a['company'], df_b['company']).ratio() > .6) and (difflib.SequenceMatcher(None, df_a['address'], df_b['address']).ratio() > .6)

有几个帖子是接近我正在寻找的，但没有一个与我想做的工作。对于如何用衍射库进行这种模糊合并，有什么建议吗？

Answer 1

可能有用的内容:测试列值的所有组合的部分匹配。如果有匹配，则为df_b分配一个键以进行合并

df_a['merge_comp'] = df_a['company'] # we will use these as the merge keys
df_a['merge_addr'] = df_a['address']

for comp_a, addr_a in df_a[['company','address']].values:
    for ixb, (comp_b, addr_b) in enumerate(df_b[['company','address']].values)
        if difflib.SequenceMatcher(None,comp_a,comp_b).ratio() > .6:
            df_b.ix[ixb,'merge_comp'] = comp_a # creates a merge key in df_b
        if difflib.SequenceMatcher(None,addr_a, addr_b).ratio() > .6:
            df_b.ix[ixb,'merge_addr'] = addr_a # creates a merge key in df_b

现在你可以合并了

merged_df = pandas.merge(df_a,df_b,on=['merge_addr','merge_comp'],how='inner')