Python search and replace in binary file

Question

I am trying to search and replace some of the text (eg 'Smith, John') in this pdf form file (header.fdf, I presumed this is treated as binary file):

'%FDF-1.2\n%\xe2\xe3\xcf\xd3\n1 0 obj\n<</FDF<</Fields[<</V(M)/T(PatientSexLabel)>><</V(24-09-1956  53)/T(PatientDateOfBirth)>><</V(Fisher)/T(PatientLastNameLabel)>><</V(CNSL)/T(PatientConsultant)>><</V(28-01-2010 18:13)/T(PatientAdmission)>><</V(134 Field Street\\rBlackburn BB1 1BB)/T(PatientAddressLabel)>><</V(Smith, John)/T(PatientName)>><</V(24-09-1956)/T(PatientDobLabel)>><</V(0123456)/T(PatientRxr)>><</V(01234567891011)/T(PatientNhsLabel)>><</V(John)/T(PatientFirstNameLabel)>><</V(0123456)/T(PatientRxrLabel)>>]>>>>\nendobj\ntrailer\n<</Root 1 0 R>>\n%%EOF\n'

After

f=open("header.fdf","rb")
s=f.read()
f.close()
s=s.replace(b'PatientName',name)

the following error occurs:

Traceback (most recent call last):
  File "/home/aj/Inkscape/Med/GAD/gad.py", line 56, in <module>
    s=s.replace(b'PatientName',name)
TypeError: expected an object with the buffer interface

How best to do this?

Answer 1

f=open("header.fdf","rb")
s=str(f.read())
f.close()
s=s.replace(b'PatientName',name)

or

f=open("header.fdf","rb")
s=f.read()
f.close()
s=s.replace(b'PatientName',bytes(name))

probably the latter, as I don't think you are going to be able to use unicode names with this type of substitution anyway