異なる列の値に基づいてデータフレームの列に値を割り当てる

Question

レジストリ編集.regファイルから変換されたCSVがあります。以下のようなデータフレーム：

Path,Key,Type,Value,date_time 
HKEY_LOCAL_MACHINE\SYSTEM\Setup\Upgrade\NsiMigrationRoot\7\1,Key,hex(0),0000000180000600,1487463163.916084 
HKEY_LOCAL_MACHINE\SYSTEM\Setup\Upgrade\NsiMigrationRoot\7\1,KeyLength,dword,00000008,1487463163.916084 
HKEY_LOCAL_MACHINE\SYSTEM\Setup\Upgrade\NsiMigrationRoot\7\1,Rw,hex(0),ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff000000000000000000000000ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff00000000ffffffffffffffffffffffffffffffffffffffffffffffffffffffff00ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff00000000ffffffffffffffffffffffff,1487463163.916084 
HKEY_LOCAL_MACHINE\SYSTEM\Setup\Upgrade\NsiMigrationRoot\7\1,RwLength,dword,000000e8,1487463163.916084 
HKEY_LOCAL_MACHINE\SYSTEM\Setup\Upgrade\NsiMigrationRoot\7\1,RwMask,hex(0),ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff,1487463163.916084 
HKEY_LOCAL_MACHINE\SYSTEM\Setup\Upgrade\NsiMigrationRoot\7\2,Key,hex(0),0000000080000600,1487463163.916084 
HKEY_LOCAL_MACHINE\SYSTEM\Setup\Upgrade\NsiMigrationRoot\7\2,KeyLength,dword,00000008,1487463163.916084 
HKEY_LOCAL_MACHINE\SYSTEM\Setup\Upgrade\NsiMigrationRoot\7\2,Rw,hex(0),ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff000000000000000000000000ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff00000000ffffffffffffffffffffffff0000000000000000000000000000000000ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff00000000ffffffffffffffffffffffff,1487463163.916084 
HKEY_LOCAL_MACHINE\SYSTEM\Setup\Upgrade\NsiMigrationRoot\7\2,RwLength,dword,000000e8,1487463163.916084 
HKEY_LOCAL_MACHINE\SYSTEM\Setup\Upgrade\NsiMigrationRoot\7\2,RwMask,hex(0),ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff,1487463163.916084 
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.bmp,@,NONE,Paint.Picture,1487463163.916084 
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.bmp,Content Type,NONE,image/bmp,1487463163.916084 
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.bmp,PerceivedType,NONE,image,1487463163.916084 
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.bmp\OpenWithList,NONE,NONE,NONE,1487463163.916084 
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.bmp\OpenWithList\MSPaint.exe,@,NONE,,1487463163.916084 
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.bmp\OpenWithProgids,Paint.Picture,NONE,,1487463163.916084 
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.bmp\PersistentHandler,@,NONE,{098f2470-bae0-11cd-b579-08002b30bfeb},1487463163.916084 
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.bmp\ShellNew,ItemName,hex(2),40002500730079007300740065006d0072006f006f00740025005c00730079007300740065006d00330032005c006d0073007000610069006e0074002e006500780065002c002d00350039003400310034000000,1487463163.916084 
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.bmp\ShellNew,NullFile,NONE,,1487463163.916084 

私は種類の六角（7）と六角（2）以下のような文字をASCIIに変換するCSVファイルにエクスポートする前に、私は右を呼び出す機能があります。

def fn(foo): 
    if "NONE" in foo: 
     return foo 
    else: 
     try: 
      x = re.sub(' |\n|\t|00', '', foo) 
      return "".join(binascii.unhexlify(x).decode()) 
     except: 
      binascii.Error 

を私はこの機能が有効であることを確認しました。

df['Value'] = df[df['Type'].str.contains('hex\\(2\\)')]['Value'].apply(lambda x: fn("".join(x))) 

これはASCIIに私のタイプの六角（2）に変換しますが、他の種類の残りの値を削除します。

私の問題は、私は以下のように変換するときにということです。

df[df['Type'].str.contains('hex\\(2\\)')]['Value'] = df[df['Type'].str.contains('hex\\(2\\)')]['Value'].apply(lambda x: fn("".join(x))) 

がどのように私はちょうど進（7）と六角（2）の値を参照し、唯一の私のデータフレームにそれらの値を交換し、一人で残りの値を残すことができます：

は、私はまた、以下のような何かをしようとしましたか？ご協力いただきありがとうございます。

Answer 1

これを試す：

In [229]: df.loc[df.Type.str.contains('hex\((?:2|7)\)'), 'Value'] = \ 
       df.loc[df.Type.str.contains('hex\((?:2|7)\)'), 'Value'].map(fn) 

In [230]: df 
Out[230]: 
             Path   Key Type         Value  date_time 
0 HKEY_LOCAL_MACHINE\SYSTEM\Setup\Upgr...   Key hex(0)       0000000180000600 1.487463e+09 
1 HKEY_LOCAL_MACHINE\SYSTEM\Setup\Upgr...  KeyLength dword         00000008 1.487463e+09 
2 HKEY_LOCAL_MACHINE\SYSTEM\Setup\Upgr...    Rw hex(0) ffffffffffffffffffffffffffffffffffff... 1.487463e+09 
3 HKEY_LOCAL_MACHINE\SYSTEM\Setup\Upgr...  RwLength dword         000000e8 1.487463e+09 
4 HKEY_LOCAL_MACHINE\SYSTEM\Setup\Upgr...   RwMask hex(0) ffffffffffffffffffffffffffffffffffff... 1.487463e+09 
5 HKEY_LOCAL_MACHINE\SYSTEM\Setup\Upgr...   Key hex(0)       0000000080000600 1.487463e+09 
6 HKEY_LOCAL_MACHINE\SYSTEM\Setup\Upgr...  KeyLength dword         00000008 1.487463e+09 
..          ...   ...  ...          ...   ... 
12 HKEY_LOCAL_MACHINE\SOFTWARE\Classes\... PerceivedType NONE         image 1.487463e+09 
13 HKEY_LOCAL_MACHINE\SOFTWARE\Classes\...   NONE NONE          NONE 1.487463e+09 
14 HKEY_LOCAL_MACHINE\SOFTWARE\Classes\...    @ NONE          NaN 1.487463e+09 
15 HKEY_LOCAL_MACHINE\SOFTWARE\Classes\... Paint.Picture NONE          NaN 1.487463e+09 
16 HKEY_LOCAL_MACHINE\SOFTWARE\Classes\...    @ NONE {098f2470-bae0-11cd-b579-08002b30bfeb} 1.487463e+09 
17 HKEY_LOCAL_MACHINE\SOFTWARE\Classes\...  ItemName hex(2) @%systemroot%\system32\mspaint.exe,-... 1.487463e+09 
18 HKEY_LOCAL_MACHINE\SOFTWARE\Classes\...  NullFile NONE          NaN 1.487463e+09 

[19 rows x 5 columns]