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POPython generator objects and .join
 

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  1. POPython generator objects and .join
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    <p>Just a fundamental question regarding python and .join() method:</p> <pre><code>file1 = open(f1,"r") file2 = open(f2,"r") file3 = open("results","w") diff = difflib.Differ() result = diff.compare(file1.read(),file2.read()) file3.write("".join(result)), </code></pre> <p>The above snippet of code yields a nice output stored in a file called "results", in string format, showing the differences between the two files line-by-line. However I notice that if I just print "result" <strong><em>without</em></strong> using .join(), the compiler returns a message that includes a memory address. After trying to write the result to the file <strong><em>without</em></strong> using .join(), I was informed by the compiler that only strings and character buffers may be used in the .join() method, and not generator objects. So based off of all the evidence that I have adduced, please correct me if I am wrong:</p> <ol> <li><p><code>result = diff.compare(file1.read(),file2.read())</code> &lt;---- result is a generator object?</p></li> <li><p><code>result</code> is a list of strings, with <code>result</code> itself being the reference to the first string?</p></li> <li><p><code>.join()</code> takes a memory address and points to the first, and then iterates over the rest of the addresses of strings in that structure?</p></li> <li><p>A generator object is an object that returns a pointer?</p></li> </ol> <p>I apologize if my questions are unclear, but I basically wanted to ask the python veterans if my deductions were correct. My question is less about the observable results, and more so about the inner workings of python. I appreciate all of your help.</p>
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    1. USeazar001
    1. USeazar001
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    1. COWhat's the message?
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      1. USMarcin
    2. COYou don't have a memory address; python gives you a representation of an object, and the default for custom objects is to show the type and memory address of the object. There is still an object there.
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      1. USMartijn Pieters
 

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