def isPDBFile(pathFileName):
#This method check if the file is a PDB file or not. if the file contains ATOM, REMARK and SEQRES, this file is a PDB. Otherwise,
# this file is not a PDB file.
path,name = os.path.split(pathFileName)
fcfrpFile = FcfrpFile(path,name)
#if fcfrpFile.find("ATOM") == -1 and fcfrpFile.find("REMARK") == -1 and fcfrpFile.find("SEQRES") and -1:
if fcfrpFile.find("ATOM") == -1 and fcfrpFile.find("SEQRES") == -1:
mensage = "The %s file is not a PDB File. Please, check it." % pathFileName
raise Exception(mensage)
