Retrieve a file from the RCSB.

def retrieve_file_from_EBI(resource, silent = True):
    '''Retrieve a file from the RCSB.'''
    #import sys
    #import traceback
    #print(resource)
    #print('\n'.join(traceback.format_stack()))
    #sys.exit(0)
    if not silent:
        colortext.printf("Retrieving %s from EBI" % os.path.split(resource)[1], color = "aqua")
    attempts = 10
    while attempts > 0:
        try:
            return get_insecure_resource("ftp.ebi.ac.uk", resource)
        except:
            print('FAILED, RETRYING')
            attempts -= 1
            time.sleep(3)