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note about print tuple

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rasbt 2014-05-25 11:31:31 -04:00
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tutorials/key_differences_between_python_2_and_3.html
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@ -1848,7 +1848,7 @@ generators
2.3
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<a class="pep reference external" href="http://www.python.org/dev/peps/pep-0255"><strong>PEP 255</strong></a>: <em>Simple Generators</em>
<a href="http://www.python.org/dev/peps/pep-0255"><strong>PEP 255</strong></a>: <em>Simple Generators</em>
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@ -1861,7 +1861,7 @@ division
3.0
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&lt;<a class="pep reference external" href="http://www.python.org/dev/peps/pep-0238"><strong>PEP 238</strong></a>: <em>Changing the Division Operator</em>
<a href="http://www.python.org/dev/peps/pep-0238"><strong>PEP 238</strong></a>: <em>Changing the Division Operator</em>
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<p>Very trivial, and the change in the print-syntax is probably the most widely known change, but still it is worth mentioning: Python 2's print function doesn't require the parantheses for invoking the print function (it wouldn't choke on them).<br />In contrast, Python 3 would raise a <code>SyntaxError</code> if we called the print function the Python 2-way without the parentheses.</p>
<p>I think this change in Python 3 makes sense in terms of consistency, since it is the common way in Python to invoke function calls with its parentheses.</p>
<p>Very trivial, and the change in the print-syntax is probably the most widely known change, but still it is worth mentioning: Python 2's print statement has been replaced by the <code>print()</code> function, meaning that we have to wrap the object that we want to print in parantheses.</p>
<p>Python 2 doesn't have a problem with additional parantheses, but in contrast, Python 3 would raise a <code>SyntaxError</code> if we called the print function the Python 2-way without the parentheses.</p>
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<p><strong>Note:</strong></p>
<p>Printing &quot;Hello, World&quot; above via Python 2 looked quite &quot;normal&quot;. However, if we have multiple objects inside the parantheses, we will create a tuple, since <code>print</code> is a &quot;statement&quot; in Python 2, not a function call.</p>
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<div class="highlight"><pre><span class="k">print</span> <span class="s">&#39;Python&#39;</span><span class="p">,</span> <span class="n">python_version</span><span class="p">()</span>
<span class="k">print</span><span class="p">(</span><span class="s">&#39;a&#39;</span><span class="p">,</span> <span class="s">&#39;b&#39;</span><span class="p">)</span>
<span class="k">print</span> <span class="s">&#39;a&#39;</span><span class="p">,</span> <span class="s">&#39;b&#39;</span>
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Python 2.7.6
(&apos;a&apos;, &apos;b&apos;)
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