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POPython) How to reduce runtime of big datasets parsing
 

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    <p>I'm gonna read, parse and integrate two huge text files as input and then create new file. <br> There are also extra another file which is used for this parsing. <br>Briefly explaining, two text files have about 100 millions of rows and three columns. <br>First, read two different files and write matched two values into new files. <br>If there is no matched value from one of input files, 0.0 will be inserted into the matrix of each row. <br>For boosting the efficiency of this parsing, I made another input file which is union file about 1st column (key) from two text files as follows. <br> I tested this code with small input files (10000 of rows). It worked well. I started running this code with huge big datasets two days before, unfortunately it is still running. <br>How to reduce the running time and parse it efficiently?</p> <p>1st_infile.txt</p> <pre><code>MARCH2_MARCH2 2.3 0.1 MARCH2_MARC2 -0.2 0 MARCH2_MARCH5 -0.3 0.3 MARCH2_MARCH6 -1.4 0 MARCH2_MARCH7 0.1 0 MARCH2_SEPT2 -1.0 0 MARCH2_SEPT4 0.8 0 </code></pre> <p>2nd_infile.txt</p> <pre><code>MARCH2_MARCH2 2.2 0 MARCH2_MARCH2.1 0.2 0 MARCH2_MARCH3 -0.4 0 MARCH2_MARCH5 -0.3 0 MARCH2_MARCH6 -0.6 0 MARCH2_MARCH7 1.2 0 MARCH2_SEPT2 0.2 0 </code></pre> <p>union_file.txt</p> <pre><code>MARCH2_MARCH2 MARCH2_MARCH2.1 MARCH2_MARC2 MARCH2_MARCH5 MARCH2_MARCH6 MARCH2_MARCH7 MARCH2_SEPT2 MARCH2_SEPT4 MARCH2_MARCH3 </code></pre> <p>Outfile.txt </p> <pre><code>MARCH2_MARCH2 2.3 0.1 2.2 0 MARCH2_MARCH2.1 0.0 0.0 0.2 0 MARCH2_MARC2 -0.2 0 0.0 0.0 MARCH2_MARCH5 -0.3 0.3 -0.3 0 MARCH2_MARCH6 -1.4 0 -0.6 0 MARCH2_MARCH7 1.2 0 1.2 0 MARCH2_SEPT2 -1.0 0 0.2 0 MARCH2_SEPT4 0.8 0 0.0 0.0 MARCH2_MARCH3 0.0 0.0 -0.4 0 </code></pre> <p>Python.py</p> <pre><code>def load(filename): ret = {} with open(filename) as f: for lineno, line in enumerate(f, 1): try: name, value1, value2 = line.split() except ValueError: print('Skip invalid line {}:{}L {0!r}'.format(filename, lineno, line)) continue ret[name] = value1, value2 return ret a, b = load('1st_infile.txt'), load('2nd_infile.txt') with open ('Union_file.txt') as f: with open('Outfile.txt', 'w') as fout: for line in f: name = line.strip() fout.write('{0:&lt;20} {1[0]:&gt;5} {1[1]:&gt;5} {2[0]:&gt;5} {2[1]:&gt;5}\n'.format( name, a.get(name, (0, 0)), b.get(name, (0, 0)) )) </code></pre>
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