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POHow to use pprint to print an object using the built-in __str__(self) method?
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copied!<p>I have a Python script which processes a .txt file which contains report usage information. I'd like to find a way to cleanly print the attributes of an object using pprint's pprint(vars(object)) function.</p> <p>The script reads the file and creates instances of a Report class. Here's the class.</p> <pre><code>class Report(object): def __init__(self, line, headers): self.date_added=get_column_by_header(line,headers,"Date Added") self.user=get_column_by_header(line,headers,"Login ID") self.report=get_column_by_header(line,headers,"Search/Report Description") self.price=get_column_by_header(line,headers,"Price") self.retail_price=get_column_by_header(line,headers,"Retail Price") def __str__(self): from pprint import pprint return str(pprint(vars(self))) </code></pre> <p>I'd like to be able to print instances of Report cleanly a-la-pprint.</p> <pre><code>for i,line in enumerate(open(path+file_1,'r')): line=line.strip().split("|") if i==0: headers=line if i==1: record=Report(line,headers) print record </code></pre> <p>When I call</p> <pre><code>print record </code></pre> <p>for a single instance of Report, this is what I get in the shell.</p> <pre><code>{'date_added': '1/3/2012 14:06', 'price': '0', 'report': 'some_report', 'retail_price': '0.25', 'user': 'some_username'} None </code></pre> <p>My question is two-fold.</p> <p>First, is this a good / desired way to print an object's attributes cleanly? Is there a better way to do this with or without pprint?</p> <p>Second, why does </p> <pre><code>None </code></pre> <p>print to the shell at the end? I'm confused where that's coming from.</p> <p>Thanks for any tips.</p>

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