[英]pandas dataframe - two column string match and group
I have a pandas dataframe which contains strings in two columns. 我有一个pandas数据帧,其中包含两列中的字符串。 I want to for each of the columns extract all strings which are similar except the numerical digits and add new columns where the similar text is exchanged against a idx value. 我想为每个列提取除数字之外相似的所有字符串,并添加新列,其中类似文本与idx值交换。
From this: 由此:
Id Name1 Name2
0 Alpha 1 Bravo 3
1 Alpha 2 Alpha 2
2 Bravo 3 Alpha 1
To This: 对此:
Id Name1 Name2 NewCol1 NewCol2
0 Alpha 1 Bravo 3 1 2
1 Alpha 2 Zero 2 1 3
2 Bravo 3 Alpha 1 2 1
Is there a simple solution to this without a big iteration loop? 没有大的迭代循环,有没有一个简单的解决方案?
I think need create Series
with MultiIndex
by stack
, remove digit
s and for categories use factorize
, last unstack
and join
to original: 我认为需要通过stack
创建具有MultiIndex
的Series
,删除digit
s,对于类别使用factorize
,last unstack
并join
到original:
s = df.set_index('Id').stack().str.replace('\d+', '')
df = df.join(pd.Series(pd.factorize(s)[0] + 1, index=s.index).unstack().add_prefix('New'))
print (df)
Id Name1 Name2 NewName1 NewName2
0 0 Alpha 1 Bravo 3 1 2
1 1 Alpha 2 Zero 2 1 3
2 2 Bravo 3 Alpha 1 2 1
Details : 细节 :
print (s)
Id
0 Name1 Alpha
Name2 Bravo
1 Name1 Alpha
Name2 Zero
2 Name1 Bravo
Name2 Alpha
dtype: object
print (pd.factorize(s)[0] + 1)
[1 2 1 3 2 1]
You may need to use a loop to iterate over column names. 您可能需要使用循环来迭代列名称。 For rows use pandas.Series.str.replace
对于行,请使用pandas.Series.str.replace
import pandas as pd
df = pd.DataFrame({'Name1' :['Alpha 1', 'Aplha 2', 'Bravo 3'], 'Name2' : ['Bravo 3', 'Alpha 2', 'Alpha 1']})
for name in df.columns.tolist():
df["newCol" + name.replace("Name", "")] = df[name].str.split(expand=True)[1]
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