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I have the following list of elements named 'files_temp':

['CDS_SPREAD_AA1EUNBCBM', 'CDS_SPREAD_AA1EUNCCBM', 'CDS_SPREAD_AA1USNBCBM', 'CDS_SPREAD_AA1USNCCBM', 'CDS_SPREAD_AALLN1EUNECBM', 'CDS_SPREAD_AALLN1USNECBM', 'CDS_SPREAD_ABB3EUNECBM', 'CDS_SPREAD_ABB3USNECBM', 'CDS_SPREAD_ABX1EUNCCBM', 'CDS_SPREAD_ABX1USNCCBM', 'CDS_SPREAD_ACAFP1EUBECBM', 'CDS_SPREAD_ACAFP1EUNECBM', 'CDS_SPREAD_ACOM1JPNACBM', 'CDS_SPREAD_ACOM1USNACBM', 'CDS_SPREAD_AEGON1EUBACBM', 'CDS_SPREAD_AEGON1EUNECBM', 'CDS_SPREAD_AEGON1JPBACBM', 'CDS_SPREAD_AEGON1USBACBM', 'CDS_SPREAD_AEGON1USNECBM', 'CDS_SPREAD_AEP1USNBCBM' ...]

I would like to keep only the alphanumeric codes, removing the CDS_SPREAD_ part and tried the following code:

files_temp=[elem.strip('CDS_SPREAD_') for elem in files_temp]

However, besides the CDS_SPREAD_ part it is also removing a part of the alphanumeric code:

['1EUNBCBM', '1EUNCCBM', '1USNBCBM', '1USNCCBM', 'LLN1EUNECBM', 'LLN1USNECBM', 'BB3EUNECBM', 'BB3USNECBM', 'BX1EUNCCBM', 'BX1USNCCBM', 'FP1EUBECBM', 'FP1EUNECBM', 'OM1JPNACBM', 'OM1USNACBM', 'GON1EUBACBM', 'GON1EUNECBM', 'GON1JPBACBM', 'GON1USBACBM', 'GON1USNECBM', '1USNBCBM', '1USNCCBM', 'T1EUNCCBM', 'T1USNBCBM' ...]

For instance, for the first element, in theory I should get AA1EUNBCBM instead of 1EUNBCBM. Would you know why this is happening? I would highly appreciate an alternative to solve the issue as well.

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  • Have you tried using replace method? Commented Feb 7, 2023 at 9:05
  • What about using elem[len("CDS_SPREAD_"):] (although not very efficient) instead of strip? Commented Feb 7, 2023 at 9:06

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The strip() function removes all the characters you are providing as the parameters. For your case, you should use replace() function.

files_temp=[elem.replace('CDS_SPREAD_', '') for elem in files_temp]
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