Strange error with text file editing in Python -


i'm using text file store weight of neural network i'm making, i'm having serious trouble editing weights stored in text field. essentially, making file regular format: word + \t + weight + \n, use follow code run through text file , grab parts:

with open(neuron_file, 'r+') original_neurons:             neuron in original_neurons:                 word_stem = re.sub(r'^([a-z-]*)([\t]?)([0-9.]*)(\n)$', r'\1', neuron)                 weight = float(re.sub(r'^([a-z-]*)([\t]?)([0-9.]*)(\n)$', r'\3', neuron))

which working, able change value of weight, , write same text file in same place. have managed create new file modified in way like, having strange problem writing original file. using below code it: 

def replace(new_file, old_file):     line in open(new_file):         open(old_file, 'w').write(str(line))

but reason function breaks @ point in file. first 80% transfers fine, cuts file off @ seemingly random point in middle of line. ideas? know there other questions on similar topics, none of them seem applicable situation, , can't find mention of error 1 i'm getting.

problem navigable, primary interest in origin of error was. i've never seen , intrigued me, had no idea going on, hoping on here have more of idea.

with open('input.txt') in_file:     open('output.txt', 'w') out_file:         line in in_file.readlines():             word, weight = line.split()[:2]             out_file.write('%s\t%s' % (word, float(weight) * 2))

with-block automaticaly closes opened files


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