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    <p>Pickle is not intended to be nice, but to serialize data to a file such that one can deserialize it efficiently later. Other modules, like the <a href="http://docs.python.org/3.3/library/pprint.html?highlight=prettyprint#module-pprint" rel="nofollow">PrettyPrint</a> module are intended to print out Python data in a nice way. If your goal is however to be able to deserialize the data later, you can have a look at the <a href="https://en.wikipedia.org/wiki/JSON" rel="nofollow">JSON</a> format and its <a href="http://docs.python.org/3.3/library/json.html?highlight=json#module-json" rel="nofollow">Python module</a></p> <pre class="lang-py prettyprint-override"><code>&gt;&gt;&gt; import pprint &gt;&gt;&gt; pp = pprint.PrettyPrinter(indent=4) &gt;&gt;&gt; pp.pprint(myIndex) { '411)': {2173: 1}, 'augmented': {1350: 1}, 'format-free': {720: 1}, 'function,': {485: 1, 831: 1, 1579: 1}, 'incorporating': {2047: 1}, 'understand': {2396: 1}} &gt;&gt;&gt; import json &gt;&gt;&gt; output = json.dumps(myIndex,sort_keys=True,indent=4, separators=(',', ': ')) &gt;&gt;&gt; print(output) { "411)": { "2173": 1 }, "augmented": { "1350": 1 }, "format-free": { "720": 1 }, "function,": { "485": 1, "831": 1, "1579": 1 }, "incorporating": { "2047": 1 }, "understand": { "2396": 1 } } &gt;&gt;&gt; myRecoveredIndex = json.loads(output) &gt;&gt;&gt; list(myRecoveredIndex.keys()) ['format-free', 'incorporating', 'function,', 'understand', 'augmented', '411)'] &gt;&gt;&gt; </code></pre> <p>If the format you suggested does matter, you can then write the file yourself according to your format. Here is a suggestion of how to do it:</p> <pre class="lang-py prettyprint-override"><code>with open("myfile.txt", "w") as fstream: for key, data in myIndex.items(): fstream.write("'{}': {!s}\n".format(key, data)) </code></pre>
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    1. POHow to write an index that I have created to a file in Python
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    1. CODoes indent=4 means the space in front of the word, for example, XXXX"2173": 1?
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    2. COYes: If indent is a non-negative integer or string, then JSON array elements and object members will be pretty-printed with that indent level. An indent level of 0, negative, or "" will only insert newlines. None (the default) selects the most compact representation. Using a positive integer indent indents that many spaces per level. If indent is a string (such as "\t"), that string is used to indent each level. Changed in version 3.2: Allow strings for indent in addition to integers. (So indent="\t" will not work for Python 2.7)
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    3. COThank you for your help. I’m appreciated that :) I have learnt more about PrettyPrinter too.
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