how to collect font list from pdf file

[longbowking]

pdffonts can collect all fonts used in a pdf file, e.g. Link

pdffonts bash-manpage.pdf 

  name                            type          encoding        emb sub uni object ID
  ------------------------------- ------------- --------------- --- --- --- ---------
  Times-Roman                     Type 1        Custom          no  no  no       8  0
  Times-Bold                      Type 1        Standard        no  no  no       9  0
  Helvetica                       Type 1        Custom          no  no  no      11  0
  Helvetica-Bold                  Type 1        Standard        no  no  no      30  0

My question is how to implement this by using pdfminer