Question

背景

下面的代码与skipping empty list and continuing with function

略有修改

import pandas as pd
Names =    [list(['Jon', 'Smith', 'jon', 'John']),
               list([]),
               list(['Bob', 'bobby', 'Bobs']),
               list([]),
               list([])]
df = pd.DataFrame({'Text' : ['Jon J Smith is Here and jon John from ', 
                                       'get nothing from here', 
                                       'I like Bob and bobby and also Bobs diner ',
                                        'nothing here too',
                                        'same here'
                            ], 

                          'P_ID': [1,2,3, 4,5], 
                          'P_Name' : Names

                         })

    #rearrange columns
df = df[['Text', 'P_ID', 'P_Name']]
df

                                 Text         P_ID  P_Name
0   Jon J Smith is Here and jon John from       1   [Jon, Smith, jon, John]
1   get nothing from here                       2   []
2   I like Bob and bobby and also Bobs diner    3   [Bob, bobby, Bobs]
3   nothing here too                            4   []
4   same here                                   5   []

工作代码

下面的代码摘自skipping empty list and continuing with function

m = df['P_Name'].str.len().ne(0)
df.loc[m, 'New'] = df.loc[m, 'Text'].replace(df.loc[m].P_Name,'**PHI**',regex=True)

并在New中产生以下df列

            Text   P_ID  P_Name   New
0                                 **PHI** J **PHI** is Here and **PHI** **PHI** ...
1                                 NaN
2                                 I like **PHI** and **PHI** and also **PHI**s d..
3                                 NaN 
4                                 NaN

所需的输出

但是，我想保留原始文本，例如，不保留行NaN，1，3中的4。 get nothing from here，如下所示

            Text   P_ID  P_Name   New
0                                 **PHI** J **PHI** is Here and **PHI** **PHI** ...
1                                 get nothing from here
2                                 I like **PHI** and **PHI** and also **PHI**s d..
3                                 nothing here too 
4                                 same here

问题

如何调整下面的代码以实现所需的输出？

m = df['P_Name'].str.len().ne(0)
df.loc[m, 'New'] = df.loc[m, 'Text'].replace(df.loc[m].P_Name,'**PHI**',regex=True)

Answer 1

只需在fillna的末尾添加此行

['#*OQL[C++]: Extending C++ with an Object Query Capability. #@José A. Blakeley #t1995 #cModern Database Systems #index0',
 '#*Transaction Management in Multidatabase Systems. #@Yuri Breitbart,Hector Garcia-Molina,Abraham Silberschatz #t1995 #cModern Database Systems #index1']

Answer 2

@tawab_shakeel关闭。只需添加：

df['New'].fillna(df['Text'], inplace=True)

fillna将从df['Text']中捕获正确的值。

我还可以使用re模块的正则表达式提出替代解决方案。

def replacing(x):
    if len(x['P_Name']) > 0:
        return re.sub('|'.join(x['P_Name']), '**PHI**', x['Text'])
    else:
        return x['Text']

df['New'] = df.apply(replacing, axis=1)

apply方法将replacing函数应用于每一行，并且替换由re.sub函数完成。

修改跳过空列表并继续执行功能

2 个答案: