python - Better debugging: expected a character buffer object -


i trying pass string section the python function below uncertain why seeing error. understanding of is not getting string, expected. have tried casting, not working either. how can solve or more debug info?

section = str('[log]') some_var = 'filename ='  edit_ini('./bench_config.ini', section, some_var, 'logs/ops_log_1')

the function causing error

def edit_ini(filename, section, some_var, value):      section = false      flist = open(filename, 'r').readlines()      f = open(filename+'test', 'w')      line in flist:             line = str(line)             print line             if line.startswith(section):                     section = true                     if( section == true ):                             if( line.startswith(some_var) ):                                     modified = "%s = $s", variable, value                                     print >> f, modified                             section = false             else:                     print >> f, line     f.close()

however see error:

traceback (most recent call last):   file "bench.py", line 89, in <module>     edit_ini('./config.ini', section, some_var, 'logs/log_1')   file "bench.py", line 68, in edit_ini     if line.startswith(section): typeerror: expected character buffer object

you overwrite passed-in section section=false. error because cannot call string.startswith( false ).

a way debug python use pdb. have helped find problem here. should read spec, heres quick guide on how use pdb. 

import pdb # code ... pdb.set_trace() # put right before line.startswith(section)

then when run code, execute right before failure. can print section in pdb, , see false, , try figure out why false.


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