filter every 24 days file (considering file name)

[RolanRoll]

Hi
I have a folder that contains many eof extension files name I want to sort them in ordinary way with python code (as you can see in my example the name of all my files contain a date like:20190729_20190731 and they are just satellite orbital information files, then select and filtered 1th,24th,47th and.... (index ) of files and delete others because I need every 24 days information files( ex.V20190822T225942_20190824T005942) not all days information .for facility I select and chose these information files from first day I need so the first file is found then I should select 24 days after from first then 47 from first or 24 days after second file and so on. I exactly need to keep my desire files as I said and delete other files in my EOF source folder my desire files are like these

S1A_OPER_AUX_POEORB_OPOD_20190819T120911_V20190729T225942_20190731T005942.EOF
S1A_OPER_AUX_POEORB_OPOD_20190912T120638_V20190822T225942_20190824T005942.EOF
.
.
.
thank you

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from importlib.metadata import files import pprint   items = os.listdir("C:/Users/m/Desktop/EOF")   eof_files = [] for item in items:         if item.lower().endswith('.eof'):         eof_files.append(item)   eof_files.sort(key=lambda fname : fname.split('_')[6]) #keeping itemes count=0 for eof_file in eof_files:  if fname.split('_')[6]==fname.split('_')[6]+24      print(f"Keeping: [eof_file]")

[Gribouillis]

then select and filtered 1th,24th,47th and.... (index ) of files and delete others because I need every 24 days information files( ex.V20190822T225942_20190824T005942) not all days information .for facility I select and chose these information files from first day I need so the first file is found then I should select 24 days after from first then 47 from first or 24 days after second file and so on.

These selection criteria are cryptic to me. I hope someone understands them.

[ibreeden]

For calculating with dates you need the datetime module. I assume there is only one file each day and we should only rely on the date and not the time.
As I don't have your files I cannot test my program but I think you need something like this.

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from importlib.metadata import files import pprint from datetime import datetime, timedelta   def extract_date(filename: str) -> str:     """ Extract the date from the name of a *.EOF file. """     isotimepart = filename.split('_')[6]     datepart = isotimepart[1:9]     return datepart   twentyfourdays = timedelta(days=24) eof_files = []   items = os.listdir("C:/Users/m/Desktop/EOF") for item in items:     if item.lower().endswith('.eof'):         eof_files.append(item)   eof_files.sort(key=lambda fname: fname.split('_')[6]) # Keeping items. # Choose the first file to keep. nextdate = extract_date(eof_files[0]) for eof_file in eof_files:     if extract_date(eof_file) == nextdate:         print(f"Keeping: {eof_file}")         # Create datetime object for date arithmetic.         dateobj = datetime.strptime(nextdate, "%Y%m%d")         nextobj = dateobj + twentyfourdays         nextdate = nextobj.strftime("%Y%m%d")

Please let us know if this works for you.

[RolanRoll]

hi again i faced with problem : from importlib.metadata import files
ImportError: No module named metadat
i use python2.7
[/quote]

[deanhystad]

importlib.metadata was introduced in Python 3.8. It does not exist in Python 2.7. If you look at the python docs you can see this.

https://docs.python.org/3/library/import...adata.html

Using importlib.metadata
New in version 3.8.

Changed in version 3.10: importlib.metadata is no longer provisional.

[RolanRoll]

hi again i have installed python 3.8 as you said and i got result but i want to select keeping files from code and delete other files in folder not just showing the desired files and if it is possible move them to another folder