Python reading file? Only reads up to the targeted line. Why? -

my problem program read past targeted line. when new name score input. e.g. txt file contains:

ana,3,6,1,

joe,1,3,

bob,1,

jack,1,1,7,

 line in txt file:      if name not in line:          empty_list.append(lines)    #append lines dont have same name      elif name in line:      s=line.split(',')      n= name      sc=s[-1]       open txt file 'w'  #so gets erased , new file updated name can written.      write(empty_list)      write(n)      write(sc) 

if input bob , score, want be:

ana,3,6,1,

joe,1,3,

bob,1,2

jack,1,1,7,

but comes out before bob , name updated :( like:

ana,3,6,1,

joe,1,3,

bob,1,2

so jack gets erased.

this should achieve want, given name "bob" , score of 10 be added.

txt_file = "scores.txt" lines = open(txt_file, 'r').readlines()  name = "bob" score = 10  open(txt_file, 'w') f:     line in lines:          if name not in line:             f.write(line)          #split line, insert new score second last         #(the last element '\n') , rejoin string         #with commas after casting integers string         elif name in line:             strings = line.split(',')             strings.insert(-1,score)             output = ",".join(str(s) s in strings)             f.write(output) 

in actuality suppose want read information dynamically, sys.argv friend here.

i think reason code fails (or rather original , not thing posted here) because you're writing empty_list when there hit, , never again. when reach target line write name , previous one, no new additions empty_list ever written.

it's not idea write file reading it. if file sufficiently small it's better store data in memory while manipulating it. doing open(txt_file, 'w') erase old contents of file.