For example with pyfasta:

pyfasta extract -help
Usage: extract some sequences from a fasta file. e.g.:
               pyfasta extract --fasta some.fasta --header at2g26540 at3g45640

Options:
  -h, --help     show this help message and exit
  --fasta=FASTA  path to the fasta file
  --header       include headers
  --exclude      extract all sequences EXCEPT those listed
  --file         if this flag is used, the sequences to extract are read from
                 the file specified in args
  --space        use the fasta identifier only up to the space as the key