Python：在大熊猫的每一行中用大括号替换尖括号和它的字符串

如何解决Python：在大熊猫的每一行中用大括号替换尖括号和它的字符串

这引用了this SO thread。

为了新颖起见，我以很小的更改来再现数据帧：

ID         Static_Text                                           Params
1      Today,<adj1> is quite Sunny. Tomorrow,<adj2>           1-10-2020  
       may be little <adj3>
1      Today,<adj2>           2-10-2020
       may be little <adj3>
1      Today,<adj2>           Cloudy
       may be little <adj3>
2      Let's have a coffee break near <adj1>,if I              Balcony
       don't get any SO reply by <adj2>
2      Let's have a coffee break near <adj1>,if I               30
       don't get any SO reply by <adj2> mins

现在，我想用<adj>替换整个{}，其中第一次出现的<adj1>应该替换为{0}。因此，结果数据帧将如下所示：

ID         Static_Text                                           Params
1      Today,{0} is quite Sunny. Tomorrow,{1}              1-10-2020  
       may be little {2}
1      Today,{1}              2-10-2020
       may be little {2}
1      Today,{1}              Cloudy
       may be little {2}
2      Let's have a coffee break near {0},if I              Balcony
       don't get any SO reply by {1}
2      Let's have a coffee break near {0},if I              30
       don't get any SO reply by {1} mins 

我正在尝试以下操作：

def replace_angular(df):
   if '<' and '>' in df['Static_Text']:
       rep_txt = re.sub(r'\<[^>]*\>',{},df[Static_Text'])
   return rep_txt

df = df.apply(lambda x : replace_angular(x),axis=1)

但是我不太确定上面的代码片段。尤其是如何在{}中引入0,1等。

解决方法

IIUC，您可以在lambda中传递一个str.replace函数作为替换：

df["Static_Text"].str.replace(r"<[A-Za-z]+(\d+)>",lambda m: '{'+f'{int(m.group(1))-1}'+'}')

0                     Today,{0} is quite Sunny. Tomorrow,{1} may be little {2}
1                     Today,{1} may be little {2}
2                     Today,{1} may be little {2}
3         Let's have a coffee break near {0},if I don't get any SO reply by {1}
4    Let's have a coffee break near {0},if I don't get any SO reply by {1} mins

,

如果adj中的数字超过9，则应将“ m.group（0）[-2]”更改为“ m.group（0）[4：-1]”。

print (df["Static_Text"].str.replace(r"<adj(\d)>",lambda m: "{"+f"{int(m.group(0)[4:-1])-1}"+"}"))