Extract 2 specific imagery bands from a list of landsat tar.gz

Question

I Have a list of Landsat scenes. Inside of tar.gz are multiple bands. Like:

File " LC08018051date.tar.gz "

LC08_date_sr_band1.tif
LC08_date_sr_band2.tif
LC08_date_sr_band3.tif
LC08_date_sr_band4.tif
LC08_date_sr_band5.tif
LC08_date_sr_band6.tif
LC08_date_sr_band7.tif

I need to extract only LC08_date_sr_band3.tif and LC08_date_sr_band4.tif to calculate an index.

This code works extracting all "band" from all files.

import tarfile
import os
import glob
files = glob.glob('L*.tar.gz')
for fileName in files:
    tfile = tarfile.open(fileName, 'r:gz')
    membersList = tfile.getmembers()
    namesList = tfile.getnames()
    bandsList = [x for x, y in zip(membersList, namesList) if "sr_band" in y]
    print("extracting...")
    tfile.extractall("Folder/",members=bandsList)
    print ("Done")

The thing is i need extract only sr_band3 and sr_band4

Answer 1

Not the best option but what i do is:

import tarfile
import os
import glob
import re
files = glob.glob('L*.tar.gz')
if not files: 
   raise Exception('No se han encontrado archivos a procesar')
for fileName in files:
    tfile = tarfile.open(fileName, 'r:gz')
    membersList = tfile.getmembers()
    namesList = tfile.getnames()
    bandsList = [x for x, y in zip(membersList, namesList) if "sr_band3" in y]
    print("extracting...")
    tfile.extractall("bands/",members=bandsList)
    print ("Done")
for fileName in files:
    tfile = tarfile.open(fileName, 'r:gz')
    membersList = tfile.getmembers()
    namesList = tfile.getnames()
    bandsList = [x for x, y in zip(membersList, namesList) if "sr_band4" in y]
    print("extracting...")
    tfile.extractall("bands/",members=bandsList)
    print ("Done")

The code enter each time to the file, so is not the fastest way.