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added input() section

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rasbt 2014-05-24 20:40:01 -04:00
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121
tutorials/key_differences_between_python_2_and_3.html
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@ -1761,6 +1761,7 @@ document.write('<a h'+'ref'+'="ma'+'ilto'+':'+e+'">'+'email'+'<\/'+'a'+'>');
<li><p><a href="#The-next-function-and-next-method">The next() function and .next() method</a></p></li> <li><p><a href="#The-next-function-and-next-method">The next() function and .next() method</a></p></li>
<li><p><a href="#For-loop-variables-and-the-global-namespace-leak">For-loop variables and the global namespace leak</a></p></li> <li><p><a href="#For-loop-variables-and-the-global-namespace-leak">For-loop variables and the global namespace leak</a></p></li>
<li><p><a href="#Comparing-unorderable-types">Comparing unorderable types</a></p></li> <li><p><a href="#Comparing-unorderable-types">Comparing unorderable types</a></p></li>
<li><p><a href="#Parsing-user-inputs-via-input">Parsing user inputs via input()</a></p></li>
<li><p><a href="#More-articles-about-Python-2-and-Python-3">More articles about Python 2 and Python 3</a></p></li> <li><p><a href="#More-articles-about-Python-2-and-Python-3">More articles about Python 2 and Python 3</a></p></li>
</ul> </ul>
</div> </div>
@ -1926,7 +1927,7 @@ unicode_literals
<div class="cell border-box-sizing code_cell rendered"> <div class="cell border-box-sizing code_cell rendered">
<div class="input"> <div class="input">
<div class="prompt input_prompt"> <div class="prompt input_prompt">
In&nbsp;[1]: In&nbsp;[3]:
</div> </div>
<div class="inner_cell"> <div class="inner_cell">
<div class="input_area"> <div class="input_area">
@ -3714,6 +3715,124 @@ Python 3.4.1
</div> </div>
</div> </div>
</div>
<div class="cell border-box-sizing text_cell rendered">
<div class="prompt input_prompt">
</div>
<div class="inner_cell">
<div class="text_cell_render border-box-sizing rendered_html">
<p><br> <br></p>
</div>
</div>
</div>
<div class="cell border-box-sizing text_cell rendered">
<div class="prompt input_prompt">
</div>
<div class="inner_cell">
<div class="text_cell_render border-box-sizing rendered_html">
<p><a id='Parsing-user-inputs-via-input'></a></p>
</div>
</div>
</div>
<div class="cell border-box-sizing text_cell rendered">
<div class="prompt input_prompt">
</div>
<div class="inner_cell">
<div class="text_cell_render border-box-sizing rendered_html">
<h2 id="Parsing-user-inputs-via-input()">Parsing user inputs via input()<a class="anchor-link" href="#Parsing-user-inputs-via-input()">&#182;</a></h2>
</div>
</div>
</div>
<div class="cell border-box-sizing text_cell rendered">
<div class="prompt input_prompt">
</div>
<div class="inner_cell">
<div class="text_cell_render border-box-sizing rendered_html">
<p>[<a href="#Sections">back to the section-overview</a>]</p>
</div>
</div>
</div>
<div class="cell border-box-sizing text_cell rendered">
<div class="prompt input_prompt">
</div>
<div class="inner_cell">
<div class="text_cell_render border-box-sizing rendered_html">
<p>Fortunately, the <code>input()</code> function was fixed in Python 3 so that it always stores the user inputs as <code>str</code> objects. In order to avoid the dangerous behavior in Python 2 to read in other types than <code>strings</code>, we have to use <code>raw_input()</code> instead.</p>
</div>
</div>
</div>
<div class="cell border-box-sizing text_cell rendered">
<div class="prompt input_prompt">
</div>
<div class="inner_cell">
<div class="text_cell_render border-box-sizing rendered_html">
<h4 id="python-2">Python 2</h4>
</div>
</div>
</div>
<div class="cell border-box-sizing text_cell rendered">
<div class="prompt input_prompt">
</div>
<div class="inner_cell">
<div class="text_cell_render border-box-sizing rendered_html">
<div style="background: #ffffff; overflow:auto;width:auto;border:solid gray;border-width:.1em .1em .1em .8em;padding:.2em .6em;"><pre style="margin: 0; line-height: 125%">Python <span style="color: #6600EE; font-weight: bold">2.7</span><span style="color: #333333">.</span><span style="color: #0000DD; font-weight: bold">6</span>
[GCC <span style="color: #6600EE; font-weight: bold">4.0</span><span style="color: #333333">.</span><span style="color: #0000DD; font-weight: bold">1</span> (Apple Inc<span style="color: #333333">.</span> build <span style="color: #0000DD; font-weight: bold">5493</span>)] on darwin
Type <span style="background-color: #fff0f0">&quot;help&quot;</span>, <span style="background-color: #fff0f0">&quot;copyright&quot;</span>, <span style="background-color: #fff0f0">&quot;credits&quot;</span> <span style="color: #000000; font-weight: bold">or</span> <span style="background-color: #fff0f0">&quot;license&quot;</span> <span style="color: #008800; font-weight: bold">for</span> more information<span style="color: #333333">.</span>
<span style="color: #333333">&gt;&gt;&gt;</span> my_input <span style="color: #333333">=</span> <span style="color: #007020">input</span>(<span style="background-color: #fff0f0">&#39;enter a number: &#39;</span>)
enter a number: <span style="color: #0000DD; font-weight: bold">123</span>
<span style="color: #333333">&gt;&gt;&gt;</span> <span style="color: #007020">type</span>(my_input)
<span style="color: #333333">&lt;</span><span style="color: #007020">type</span> <span style="background-color: #fff0f0">&#39;int&#39;</span><span style="color: #333333">&gt;</span>
<span style="color: #333333">&gt;&gt;&gt;</span> my_input <span style="color: #333333">=</span> raw_input(<span style="background-color: #fff0f0">&#39;enter a number: &#39;</span>)
enter a number: <span style="color: #0000DD; font-weight: bold">123</span>
<span style="color: #333333">&gt;&gt;&gt;</span> <span style="color: #007020">type</span>(my_input)
<span style="color: #333333">&lt;</span><span style="color: #007020">type</span> <span style="background-color: #fff0f0">&#39;str&#39;</span><span style="color: #333333">&gt;</span>
</pre></div>
</div>
</div>
</div>
<div class="cell border-box-sizing text_cell rendered">
<div class="prompt input_prompt">
</div>
<div class="inner_cell">
<div class="text_cell_render border-box-sizing rendered_html">
<p><br></p>
</div>
</div>
</div>
<div class="cell border-box-sizing text_cell rendered">
<div class="prompt input_prompt">
</div>
<div class="inner_cell">
<div class="text_cell_render border-box-sizing rendered_html">
<h4 id="python-3">Python 3</h4>
</div>
</div>
</div>
<div class="cell border-box-sizing text_cell rendered">
<div class="prompt input_prompt">
</div>
<div class="inner_cell">
<div class="text_cell_render border-box-sizing rendered_html">
<!-- HTML generated using hilite.me --><div style="background: #ffffff; overflow:auto;width:auto;border:solid gray;border-width:.1em .1em .1em .8em;padding:.2em .6em;"><pre style="margin: 0; line-height: 125%">Python <span style="color: #6600EE; font-weight: bold">3.4</span><span style="color: #333333">.</span><span style="color: #0000DD; font-weight: bold">1</span>
[GCC <span style="color: #6600EE; font-weight: bold">4.2</span><span style="color: #333333">.</span><span style="color: #0000DD; font-weight: bold">1</span> (Apple Inc<span style="color: #333333">.</span> build <span style="color: #0000DD; font-weight: bold">5577</span>)] on darwin
Type <span style="background-color: #fff0f0">&quot;help&quot;</span>, <span style="background-color: #fff0f0">&quot;copyright&quot;</span>, <span style="background-color: #fff0f0">&quot;credits&quot;</span> <span style="color: #000000; font-weight: bold">or</span> <span style="background-color: #fff0f0">&quot;license&quot;</span> <span style="color: #008800; font-weight: bold">for</span> more information<span style="color: #333333">.</span>
<span style="color: #333333">&gt;&gt;&gt;</span> my_input <span style="color: #333333">=</span> <span style="color: #007020">input</span>(<span style="background-color: #fff0f0">&#39;enter a number: &#39;</span>)
enter a number: <span style="color: #0000DD; font-weight: bold">123</span>
<span style="color: #333333">&gt;&gt;&gt;</span> <span style="color: #007020">type</span>(my_input)
<span style="color: #333333">&lt;</span><span style="color: #008800; font-weight: bold">class</span> <span style="color: #FF0000; background-color: #FFAAAA">&#39;</span><span style="color: #BB0066; font-weight: bold">str</span><span style="background-color: #fff0f0">&#39;&gt;</span>
</pre></div>
</div>
</div>
</div> </div>
<div class="cell border-box-sizing text_cell rendered"> <div class="cell border-box-sizing text_cell rendered">
<div class="prompt input_prompt"> <div class="prompt input_prompt">

105
tutorials/key_differences_between_python_2_and_3.ipynb
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@ -1,7 +1,7 @@
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@ -93,6 +93,8 @@
"\n", "\n",
"- [Comparing unorderable types](#Comparing-unorderable-types)\n", "- [Comparing unorderable types](#Comparing-unorderable-types)\n",
"\n", "\n",
"- [Parsing user inputs via input()](#Parsing-user-inputs-via-input)\n",
"\n",
"- [More articles about Python 2 and Python 3](#More-articles-about-Python-2-and-Python-3)" "- [More articles about Python 2 and Python 3](#More-articles-about-Python-2-and-Python-3)"
] ]
}, },
@ -196,7 +198,7 @@
"language": "python", "language": "python",
"metadata": {}, "metadata": {},
"outputs": [], "outputs": [],
"prompt_number": 1 "prompt_number": 3
}, },
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@ -1495,6 +1497,105 @@
"<br>" "<br>"
] ]
}, },
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<a id='Parsing-user-inputs-via-input'></a>"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Parsing user inputs via input()"
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{
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"source": [
"[[back to the section-overview](#Sections)]"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"Fortunately, the `input()` function was fixed in Python 3 so that it always stores the user inputs as `str` objects. In order to avoid the dangerous behavior in Python 2 to read in other types than `strings`, we have to use `raw_input()` instead."
]
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{
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"source": [
"#### Python 2"
]
},
{
"cell_type": "markdown",
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"source": [
"<div style=\"background: #ffffff; overflow:auto;width:auto;border:solid gray;border-width:.1em .1em .1em .8em;padding:.2em .6em;\"><pre style=\"margin: 0; line-height: 125%\">Python <span style=\"color: #6600EE; font-weight: bold\">2.7</span><span style=\"color: #333333\">.</span><span style=\"color: #0000DD; font-weight: bold\">6</span> \n",
"[GCC <span style=\"color: #6600EE; font-weight: bold\">4.0</span><span style=\"color: #333333\">.</span><span style=\"color: #0000DD; font-weight: bold\">1</span> (Apple Inc<span style=\"color: #333333\">.</span> build <span style=\"color: #0000DD; font-weight: bold\">5493</span>)] on darwin\n",
"Type <span style=\"background-color: #fff0f0\">&quot;help&quot;</span>, <span style=\"background-color: #fff0f0\">&quot;copyright&quot;</span>, <span style=\"background-color: #fff0f0\">&quot;credits&quot;</span> <span style=\"color: #000000; font-weight: bold\">or</span> <span style=\"background-color: #fff0f0\">&quot;license&quot;</span> <span style=\"color: #008800; font-weight: bold\">for</span> more information<span style=\"color: #333333\">.</span>\n",
"\n",
"<span style=\"color: #333333\">&gt;&gt;&gt;</span> my_input <span style=\"color: #333333\">=</span> <span style=\"color: #007020\">input</span>(<span style=\"background-color: #fff0f0\">&#39;enter a number: &#39;</span>)\n",
"\n",
"enter a number: <span style=\"color: #0000DD; font-weight: bold\">123</span>\n",
"\n",
"<span style=\"color: #333333\">&gt;&gt;&gt;</span> <span style=\"color: #007020\">type</span>(my_input)\n",
"<span style=\"color: #333333\">&lt;</span><span style=\"color: #007020\">type</span> <span style=\"background-color: #fff0f0\">&#39;int&#39;</span><span style=\"color: #333333\">&gt;</span>\n",
"\n",
"<span style=\"color: #333333\">&gt;&gt;&gt;</span> my_input <span style=\"color: #333333\">=</span> raw_input(<span style=\"background-color: #fff0f0\">&#39;enter a number: &#39;</span>)\n",
"\n",
"enter a number: <span style=\"color: #0000DD; font-weight: bold\">123</span>\n",
"\n",
"<span style=\"color: #333333\">&gt;&gt;&gt;</span> <span style=\"color: #007020\">type</span>(my_input)\n",
"<span style=\"color: #333333\">&lt;</span><span style=\"color: #007020\">type</span> <span style=\"background-color: #fff0f0\">&#39;str&#39;</span><span style=\"color: #333333\">&gt;</span>\n",
"</pre></div>\n"
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"<br>"
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{
"cell_type": "markdown",
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"#### Python 3"
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{
"cell_type": "markdown",
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"source": [
"<!-- HTML generated using hilite.me --><div style=\"background: #ffffff; overflow:auto;width:auto;border:solid gray;border-width:.1em .1em .1em .8em;padding:.2em .6em;\"><pre style=\"margin: 0; line-height: 125%\">Python <span style=\"color: #6600EE; font-weight: bold\">3.4</span><span style=\"color: #333333\">.</span><span style=\"color: #0000DD; font-weight: bold\">1</span> \n",
"[GCC <span style=\"color: #6600EE; font-weight: bold\">4.2</span><span style=\"color: #333333\">.</span><span style=\"color: #0000DD; font-weight: bold\">1</span> (Apple Inc<span style=\"color: #333333\">.</span> build <span style=\"color: #0000DD; font-weight: bold\">5577</span>)] on darwin\n",
"Type <span style=\"background-color: #fff0f0\">&quot;help&quot;</span>, <span style=\"background-color: #fff0f0\">&quot;copyright&quot;</span>, <span style=\"background-color: #fff0f0\">&quot;credits&quot;</span> <span style=\"color: #000000; font-weight: bold\">or</span> <span style=\"background-color: #fff0f0\">&quot;license&quot;</span> <span style=\"color: #008800; font-weight: bold\">for</span> more information<span style=\"color: #333333\">.</span>\n",
"\n",
"<span style=\"color: #333333\">&gt;&gt;&gt;</span> my_input <span style=\"color: #333333\">=</span> <span style=\"color: #007020\">input</span>(<span style=\"background-color: #fff0f0\">&#39;enter a number: &#39;</span>)\n",
"\n",
"enter a number: <span style=\"color: #0000DD; font-weight: bold\">123</span>\n",
"\n",
"<span style=\"color: #333333\">&gt;&gt;&gt;</span> <span style=\"color: #007020\">type</span>(my_input)\n",
"<span style=\"color: #333333\">&lt;</span><span style=\"color: #008800; font-weight: bold\">class</span> <span style=\"color: #FF0000; background-color: #FFAAAA\">&#39;</span><span style=\"color: #BB0066; font-weight: bold\">str</span><span style=\"background-color: #fff0f0\">&#39;&gt;</span>\n",
"</pre></div>\n"
]
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"<br>\n",
"<br>"
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{ {
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