mirror of
https://github.com/rasbt/python_reference.git
synced 2024-11-27 14:01:15 +00:00
added input() section
This commit is contained in:
rasbt
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@ -1761,6 +1761,7 @@ document.write('<a h'+'ref'+'="ma'+'ilto'+':'+e+'">'+'email'+'<\/'+'a'+'>');
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<li><p><a href="#The-next-function-and-next-method">The next() function and .next() method</a></p></li>
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<li><p><a href="#For-loop-variables-and-the-global-namespace-leak">For-loop variables and the global namespace leak</a></p></li>
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<li><p><a href="#Comparing-unorderable-types">Comparing unorderable types</a></p></li>
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<li><p><a href="#Parsing-user-inputs-via-input">Parsing user inputs via input()</a></p></li>
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<li><p><a href="#More-articles-about-Python-2-and-Python-3">More articles about Python 2 and Python 3</a></p></li>
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</ul>
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</div>
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@ -1926,7 +1927,7 @@ unicode_literals
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<div class="cell border-box-sizing code_cell rendered">
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<div class="input">
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<div class="prompt input_prompt">
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In [1]:
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In [3]:
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</div>
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<div class="inner_cell">
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<div class="input_area">
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@ -3714,6 +3715,124 @@ Python 3.4.1
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</div>
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</div>
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</div>
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<div class="cell border-box-sizing text_cell rendered">
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<div class="prompt input_prompt">
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</div>
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<div class="inner_cell">
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<div class="text_cell_render border-box-sizing rendered_html">
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<p><br> <br></p>
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</div>
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</div>
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</div>
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<div class="cell border-box-sizing text_cell rendered">
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<div class="prompt input_prompt">
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</div>
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<div class="inner_cell">
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<div class="text_cell_render border-box-sizing rendered_html">
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<p><a id='Parsing-user-inputs-via-input'></a></p>
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</div>
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</div>
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</div>
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<div class="cell border-box-sizing text_cell rendered">
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<div class="prompt input_prompt">
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</div>
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<div class="inner_cell">
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<div class="text_cell_render border-box-sizing rendered_html">
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<h2 id="Parsing-user-inputs-via-input()">Parsing user inputs via input()<a class="anchor-link" href="#Parsing-user-inputs-via-input()">¶</a></h2>
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</div>
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</div>
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</div>
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<div class="cell border-box-sizing text_cell rendered">
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<div class="prompt input_prompt">
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</div>
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<div class="inner_cell">
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<div class="text_cell_render border-box-sizing rendered_html">
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<p>[<a href="#Sections">back to the section-overview</a>]</p>
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</div>
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</div>
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</div>
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<div class="cell border-box-sizing text_cell rendered">
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<div class="prompt input_prompt">
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</div>
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<div class="inner_cell">
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<div class="text_cell_render border-box-sizing rendered_html">
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<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>
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</div>
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</div>
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</div>
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<div class="cell border-box-sizing text_cell rendered">
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<div class="prompt input_prompt">
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</div>
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<div class="inner_cell">
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<div class="text_cell_render border-box-sizing rendered_html">
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<h4 id="python-2">Python 2</h4>
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</div>
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</div>
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</div>
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<div class="cell border-box-sizing text_cell rendered">
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<div class="prompt input_prompt">
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</div>
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<div class="inner_cell">
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<div class="text_cell_render border-box-sizing rendered_html">
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<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>
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[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
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Type <span style="background-color: #fff0f0">"help"</span>, <span style="background-color: #fff0f0">"copyright"</span>, <span style="background-color: #fff0f0">"credits"</span> <span style="color: #000000; font-weight: bold">or</span> <span style="background-color: #fff0f0">"license"</span> <span style="color: #008800; font-weight: bold">for</span> more information<span style="color: #333333">.</span>
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<span style="color: #333333">>>></span> my_input <span style="color: #333333">=</span> <span style="color: #007020">input</span>(<span style="background-color: #fff0f0">'enter a number: '</span>)
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enter a number: <span style="color: #0000DD; font-weight: bold">123</span>
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<span style="color: #333333">>>></span> <span style="color: #007020">type</span>(my_input)
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<span style="color: #333333"><</span><span style="color: #007020">type</span> <span style="background-color: #fff0f0">'int'</span><span style="color: #333333">></span>
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<span style="color: #333333">>>></span> my_input <span style="color: #333333">=</span> raw_input(<span style="background-color: #fff0f0">'enter a number: '</span>)
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enter a number: <span style="color: #0000DD; font-weight: bold">123</span>
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<span style="color: #333333">>>></span> <span style="color: #007020">type</span>(my_input)
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<span style="color: #333333"><</span><span style="color: #007020">type</span> <span style="background-color: #fff0f0">'str'</span><span style="color: #333333">></span>
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</pre></div>
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</div>
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</div>
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</div>
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<div class="cell border-box-sizing text_cell rendered">
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<div class="prompt input_prompt">
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</div>
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<div class="inner_cell">
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<div class="text_cell_render border-box-sizing rendered_html">
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<p><br></p>
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</div>
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</div>
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</div>
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<div class="cell border-box-sizing text_cell rendered">
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<div class="prompt input_prompt">
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</div>
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<div class="inner_cell">
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<div class="text_cell_render border-box-sizing rendered_html">
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<h4 id="python-3">Python 3</h4>
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</div>
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</div>
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</div>
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<div class="cell border-box-sizing text_cell rendered">
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<div class="prompt input_prompt">
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</div>
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<div class="inner_cell">
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<div class="text_cell_render border-box-sizing rendered_html">
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<!-- 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>
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[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
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Type <span style="background-color: #fff0f0">"help"</span>, <span style="background-color: #fff0f0">"copyright"</span>, <span style="background-color: #fff0f0">"credits"</span> <span style="color: #000000; font-weight: bold">or</span> <span style="background-color: #fff0f0">"license"</span> <span style="color: #008800; font-weight: bold">for</span> more information<span style="color: #333333">.</span>
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<span style="color: #333333">>>></span> my_input <span style="color: #333333">=</span> <span style="color: #007020">input</span>(<span style="background-color: #fff0f0">'enter a number: '</span>)
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enter a number: <span style="color: #0000DD; font-weight: bold">123</span>
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<span style="color: #333333">>>></span> <span style="color: #007020">type</span>(my_input)
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<span style="color: #333333"><</span><span style="color: #008800; font-weight: bold">class</span> <span style="color: #FF0000; background-color: #FFAAAA">'</span><span style="color: #BB0066; font-weight: bold">str</span><span style="background-color: #fff0f0">'></span>
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</pre></div>
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</div>
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</div>
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</div>
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<div class="cell border-box-sizing text_cell rendered">
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<div class="prompt input_prompt">
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@ -1,7 +1,7 @@
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{
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"metadata": {
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"name": "",
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"signature": "sha256:bce64714d9af46abdf20f98e6b5b0b51cd1240612c1dbd99a40d812aea22dcdf"
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"signature": "sha256:2d8d614150aba437b28f7fe22d2e6a05b76ddb1a447d645c7d5085ab0c286c44"
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},
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"nbformat": 3,
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"nbformat_minor": 0,
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@ -93,6 +93,8 @@
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"\n",
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"- [Comparing unorderable types](#Comparing-unorderable-types)\n",
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"\n",
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"- [Parsing user inputs via input()](#Parsing-user-inputs-via-input)\n",
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"\n",
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"- [More articles about Python 2 and Python 3](#More-articles-about-Python-2-and-Python-3)"
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]
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},
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@ -196,7 +198,7 @@
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"language": "python",
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"metadata": {},
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"outputs": [],
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"prompt_number": 1
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"prompt_number": 3
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},
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{
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"cell_type": "markdown",
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@ -1495,6 +1497,105 @@
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"<br>"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"<a id='Parsing-user-inputs-via-input'></a>"
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]
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},
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{
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"cell_type": "heading",
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"level": 2,
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"metadata": {},
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"source": [
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"Parsing user inputs via input()"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"[[back to the section-overview](#Sections)]"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"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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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"#### Python 2"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"<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",
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"[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",
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"Type <span style=\"background-color: #fff0f0\">"help"</span>, <span style=\"background-color: #fff0f0\">"copyright"</span>, <span style=\"background-color: #fff0f0\">"credits"</span> <span style=\"color: #000000; font-weight: bold\">or</span> <span style=\"background-color: #fff0f0\">"license"</span> <span style=\"color: #008800; font-weight: bold\">for</span> more information<span style=\"color: #333333\">.</span>\n",
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"\n",
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"<span style=\"color: #333333\">>>></span> my_input <span style=\"color: #333333\">=</span> <span style=\"color: #007020\">input</span>(<span style=\"background-color: #fff0f0\">'enter a number: '</span>)\n",
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"\n",
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"enter a number: <span style=\"color: #0000DD; font-weight: bold\">123</span>\n",
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"\n",
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"<span style=\"color: #333333\">>>></span> <span style=\"color: #007020\">type</span>(my_input)\n",
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"<span style=\"color: #333333\"><</span><span style=\"color: #007020\">type</span> <span style=\"background-color: #fff0f0\">'int'</span><span style=\"color: #333333\">></span>\n",
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"\n",
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"<span style=\"color: #333333\">>>></span> my_input <span style=\"color: #333333\">=</span> raw_input(<span style=\"background-color: #fff0f0\">'enter a number: '</span>)\n",
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"\n",
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"enter a number: <span style=\"color: #0000DD; font-weight: bold\">123</span>\n",
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"\n",
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"<span style=\"color: #333333\">>>></span> <span style=\"color: #007020\">type</span>(my_input)\n",
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"<span style=\"color: #333333\"><</span><span style=\"color: #007020\">type</span> <span style=\"background-color: #fff0f0\">'str'</span><span style=\"color: #333333\">></span>\n",
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"</pre></div>\n"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"<br>"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"#### Python 3"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"<!-- 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",
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"[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",
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"Type <span style=\"background-color: #fff0f0\">"help"</span>, <span style=\"background-color: #fff0f0\">"copyright"</span>, <span style=\"background-color: #fff0f0\">"credits"</span> <span style=\"color: #000000; font-weight: bold\">or</span> <span style=\"background-color: #fff0f0\">"license"</span> <span style=\"color: #008800; font-weight: bold\">for</span> more information<span style=\"color: #333333\">.</span>\n",
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"\n",
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"<span style=\"color: #333333\">>>></span> my_input <span style=\"color: #333333\">=</span> <span style=\"color: #007020\">input</span>(<span style=\"background-color: #fff0f0\">'enter a number: '</span>)\n",
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"\n",
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"enter a number: <span style=\"color: #0000DD; font-weight: bold\">123</span>\n",
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"\n",
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"<span style=\"color: #333333\">>>></span> <span style=\"color: #007020\">type</span>(my_input)\n",
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"<span style=\"color: #333333\"><</span><span style=\"color: #008800; font-weight: bold\">class</span> <span style=\"color: #FF0000; background-color: #FFAAAA\">'</span><span style=\"color: #BB0066; font-weight: bold\">str</span><span style=\"background-color: #fff0f0\">'></span>\n",
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"</pre></div>\n"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"<br>\n",
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"<br>"
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]
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},
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{
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"cell_type": "heading",
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"level": 2,
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