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<div class="section" id="tutorial">
<span id="id1"></span><h1>Tutorial<a class="headerlink" href="#tutorial" title="Permalink to this headline">¶</a></h1>
<div class="section" id="converting-quantities">
<h2>Converting Quantities<a class="headerlink" href="#converting-quantities" title="Permalink to this headline">¶</a></h2>
<p>Pint has the concept of Unit Registry, an object within which units are defined and handled. You start by creating your registry:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="kn">from</span> <span class="nn">pint</span> <span class="kn">import</span> <span class="n">UnitRegistry</span>
<span class="gp">>>> </span><span class="n">ureg</span> <span class="o">=</span> <span class="n">UnitRegistry</span><span class="p">()</span>
</pre></div>
</div>
<p>If no parameter is given to the constructor, the unit registry is populated with the default list of units and prefixes.
You can now simply use the registry in the following way:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="n">distance</span> <span class="o">=</span> <span class="mf">24.0</span> <span class="o">*</span> <span class="n">ureg</span><span class="o">.</span><span class="n">meter</span>
<span class="gp">>>> </span><span class="k">print</span><span class="p">(</span><span class="n">distance</span><span class="p">)</span>
<span class="go">24.0 meter</span>
<span class="gp">>>> </span><span class="n">time</span> <span class="o">=</span> <span class="mf">8.0</span> <span class="o">*</span> <span class="n">ureg</span><span class="o">.</span><span class="n">second</span>
<span class="gp">>>> </span><span class="k">print</span><span class="p">(</span><span class="n">time</span><span class="p">)</span>
<span class="go">8.0 second</span>
<span class="gp">>>> </span><span class="k">print</span><span class="p">(</span><span class="nb">repr</span><span class="p">(</span><span class="n">time</span><span class="p">))</span>
<span class="go"><Quantity(8.0, 'second')></span>
</pre></div>
</div>
<p>In this code <cite>distance</cite> and <cite>time</cite> are physical quantities objects (<cite>Quantity</cite>). Physical quantities can be queried for the magnitude, units, and dimensionality:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="k">print</span><span class="p">(</span><span class="n">distance</span><span class="o">.</span><span class="n">magnitude</span><span class="p">)</span>
<span class="go">24.0</span>
<span class="gp">>>> </span><span class="k">print</span><span class="p">(</span><span class="n">distance</span><span class="o">.</span><span class="n">units</span><span class="p">)</span>
<span class="go">meter</span>
<span class="gp">>>> </span><span class="k">print</span><span class="p">(</span><span class="n">distance</span><span class="o">.</span><span class="n">dimensionality</span><span class="p">)</span>
<span class="go">[length]</span>
</pre></div>
</div>
<p>and can handle mathematical operations between:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="n">speed</span> <span class="o">=</span> <span class="n">distance</span> <span class="o">/</span> <span class="n">time</span>
<span class="gp">>>> </span><span class="k">print</span><span class="p">(</span><span class="n">speed</span><span class="p">)</span>
<span class="go">3.0 meter / second</span>
</pre></div>
</div>
<p>As unit registry knows about the relationship between different units, you can convert quantities to the unit of choice:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="n">speed</span><span class="o">.</span><span class="n">to</span><span class="p">(</span><span class="n">ureg</span><span class="o">.</span><span class="n">inch</span> <span class="o">/</span> <span class="n">ureg</span><span class="o">.</span><span class="n">minute</span> <span class="p">)</span>
<span class="go"><Quantity(7086.614173228345, 'inch / minute')></span>
</pre></div>
</div>
<p>This method returns a new object leaving the original intact as can be seen by:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="k">print</span><span class="p">(</span><span class="n">speed</span><span class="p">)</span>
<span class="go">3.0 meter / second</span>
</pre></div>
</div>
<p>If you want to convert in-place (i.e. without creating another object), you can use the <cite>ito</cite> method:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="n">speed</span><span class="o">.</span><span class="n">ito</span><span class="p">(</span><span class="n">ureg</span><span class="o">.</span><span class="n">inch</span> <span class="o">/</span> <span class="n">ureg</span><span class="o">.</span><span class="n">minute</span> <span class="p">)</span>
<span class="go"><Quantity(7086.614173228345, 'inch / minute')></span>
<span class="gp">>>> </span><span class="k">print</span><span class="p">(</span><span class="n">speed</span><span class="p">)</span>
<span class="go">7086.614173228345 inch / minute</span>
</pre></div>
</div>
<p>If you ask Pint to perform an invalid conversion:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="n">speed</span><span class="o">.</span><span class="n">to</span><span class="p">(</span><span class="n">ureg</span><span class="o">.</span><span class="n">joule</span><span class="p">)</span>
<span class="gt">Traceback (most recent call last):</span>
<span class="c">...</span>
<span class="gr">pint.pint.DimensionalityError</span>: <span class="n">Cannot convert from 'inch / minute' (length / time) to 'joule' (length ** 2 * mass / time ** 2)</span>
</pre></div>
</div>
<p>There are also methods ‘to_base_units’ and ‘ito_base_units’ which automatically convert to the reference units with the correct dimensionality:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="n">height</span> <span class="o">=</span> <span class="mf">5.0</span> <span class="o">*</span> <span class="n">ureg</span><span class="o">.</span><span class="n">foot</span> <span class="o">+</span> <span class="mf">9.0</span> <span class="o">*</span> <span class="n">ureg</span><span class="o">.</span><span class="n">inch</span>
<span class="gp">>>> </span><span class="k">print</span><span class="p">(</span><span class="n">height</span><span class="p">)</span>
<span class="go">5.75 foot</span>
<span class="gp">>>> </span><span class="k">print</span><span class="p">(</span><span class="n">height</span><span class="o">.</span><span class="n">to_base_units</span><span class="p">())</span>
<span class="go">1.7526 meter</span>
<span class="gp">>>> </span><span class="k">print</span><span class="p">(</span><span class="n">height</span><span class="p">)</span>
<span class="go">5.75 foot</span>
<span class="gp">>>> </span><span class="n">height</span><span class="o">.</span><span class="n">ito_base_units</span><span class="p">()</span>
<span class="gp">>>> </span><span class="k">print</span><span class="p">(</span><span class="n">height</span><span class="p">)</span>
<span class="go">1.7526 meter</span>
</pre></div>
</div>
<p>In some cases it is useful to define physical quantities objects using the class constructor:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="n">Q_</span> <span class="o">=</span> <span class="n">ureg</span><span class="o">.</span><span class="n">Quantity</span>
<span class="gp">>>> </span><span class="n">Q_</span><span class="p">(</span><span class="mf">1.78</span><span class="p">,</span> <span class="n">ureg</span><span class="o">.</span><span class="n">meter</span><span class="p">)</span> <span class="o">==</span> <span class="mf">1.78</span> <span class="o">*</span> <span class="n">ureg</span><span class="o">.</span><span class="n">meter</span>
<span class="go">True</span>
</pre></div>
</div>
<p>(I tend to abbreviate Quantity as <cite>Q_</cite>) The in-built parse allows to recognize prefixed and pluralized units even though they are not in the definition list:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="n">distance</span> <span class="o">=</span> <span class="mi">42</span> <span class="o">*</span> <span class="n">ureg</span><span class="o">.</span><span class="n">kilometers</span>
<span class="gp">>>> </span><span class="k">print</span><span class="p">(</span><span class="n">distance</span><span class="p">)</span>
<span class="go">42 kilometer</span>
<span class="gp">>>> </span><span class="k">print</span><span class="p">(</span><span class="n">distance</span><span class="o">.</span><span class="n">to</span><span class="p">(</span><span class="n">ureg</span><span class="o">.</span><span class="n">meter</span><span class="p">))</span>
<span class="go">42000.0 meter</span>
</pre></div>
</div>
<p>If you try to use a unit which is not in the registry:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="n">speed</span> <span class="o">=</span> <span class="mi">23</span> <span class="o">*</span> <span class="n">ureg</span><span class="o">.</span><span class="n">snail_speed</span>
<span class="gt">Traceback (most recent call last):</span>
<span class="c">...</span>
<span class="gr">pint.pint.UndefinedUnitError</span>: <span class="n">'snail_speed' is not defined in the unit registry</span>
</pre></div>
</div>
<p>You can add your own units to the registry or build your own list. More info on that <a class="reference internal" href="defining.html#defining"><span>Defining units</span></a></p>
</div>
<div class="section" id="string-parsing">
<h2>String parsing<a class="headerlink" href="#string-parsing" title="Permalink to this headline">¶</a></h2>
<p>Pint can also handle units and units provided as strings:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="mf">2.54</span> <span class="o">*</span> <span class="n">ureg</span><span class="o">.</span><span class="n">parse_expression</span><span class="p">(</span><span class="s1">'centimeter'</span><span class="p">)</span>
<span class="go"><Quantity(2.54, 'centimeter')></span>
</pre></div>
</div>
<p>or using the registry as a callable for a short form:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="mf">2.54</span> <span class="o">*</span> <span class="n">ureg</span><span class="p">(</span><span class="s1">'centimeter'</span><span class="p">)</span>
<span class="go"><Quantity(2.54, 'centimeter')></span>
</pre></div>
</div>
<p>or using the <cite>Quantity</cite> constructor:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="n">Q_</span><span class="p">(</span><span class="mf">2.54</span><span class="p">,</span> <span class="s1">'centimeter'</span><span class="p">)</span>
<span class="go"><Quantity(2.54, 'centimeter')></span>
</pre></div>
</div>
<p>Numbers are also parsed, so you can use an expression:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="n">ureg</span><span class="p">(</span><span class="s1">'2.54 * centimeter'</span><span class="p">)</span>
<span class="go"><Quantity(2.54, 'centimeter')></span>
</pre></div>
</div>
<p>or:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="n">Q_</span><span class="p">(</span><span class="s1">'2.54 * centimeter'</span><span class="p">)</span>
<span class="go"><Quantity(2.54, 'centimeter')></span>
</pre></div>
</div>
<p>This enables you to build a simple unit converter in 3 lines:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="n">user_input</span> <span class="o">=</span> <span class="s1">'2.54 * centimeter to inch'</span>
<span class="gp">>>> </span><span class="n">src</span><span class="p">,</span> <span class="n">dst</span> <span class="o">=</span> <span class="n">user_input</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s1">' to '</span><span class="p">)</span>
<span class="gp">>>> </span><span class="n">Q_</span><span class="p">(</span><span class="n">src</span><span class="p">)</span><span class="o">.</span><span class="n">to</span><span class="p">(</span><span class="n">dst</span><span class="p">)</span>
<span class="go"><Quantity(1.0, 'inch')></span>
</pre></div>
</div>
<div class="admonition warning">
<p class="first admonition-title">Warning</p>
<p class="last">Pint currently uses <a class="reference external" href="http://docs.python.org/3/library/functions.html#eval">eval</a> under the hood.
Do not use this approach from untrusted sources as it is <a class="reference external" href="http://nedbatchelder.com/blog/201206/eval_really_is_dangerous.html">dangerous</a>.</p>
</div>
</div>
<div class="section" id="string-formatting">
<h2>String formatting<a class="headerlink" href="#string-formatting" title="Permalink to this headline">¶</a></h2>
<p>Pint’s physical quantities can be easily printed:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="n">accel</span> <span class="o">=</span> <span class="mf">1.3</span> <span class="o">*</span> <span class="n">ureg</span><span class="p">[</span><span class="s1">'meter/second**2'</span><span class="p">]</span>
<span class="gp">>>> </span><span class="c1"># The standard string formatting code</span>
<span class="gp">>>> </span><span class="k">print</span><span class="p">(</span><span class="s1">'The str is {!s}'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">accel</span><span class="p">))</span>
<span class="go">The str is 1.3 meter / second ** 2</span>
<span class="gp">>>> </span><span class="c1"># The standard representation formatting code</span>
<span class="gp">>>> </span><span class="k">print</span><span class="p">(</span><span class="s1">'The repr is {!r}'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">accel</span><span class="p">))</span>
<span class="go">The repr is <Quantity(1.3, 'meter / second ** 2')></span>
<span class="gp">>>> </span><span class="c1"># Accessing useful attributes</span>
<span class="gp">>>> </span><span class="k">print</span><span class="p">(</span><span class="s1">'The magnitude is {0.magnitude} with units {0.units}'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">accel</span><span class="p">))</span>
<span class="go">The magnitude is 1.3 with units meter / second ** 2</span>
</pre></div>
</div>
<p>But Pint also extends the standard formatting capabilities for unicode and latex representations:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="n">accel</span> <span class="o">=</span> <span class="mf">1.3</span> <span class="o">*</span> <span class="n">ureg</span><span class="p">[</span><span class="s1">'meter/second**2'</span><span class="p">]</span>
<span class="gp">>>> </span><span class="c1"># Pretty print</span>
<span class="gp">>>> </span><span class="s1">'The pretty representation is {:P}'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">accel</span><span class="p">)</span>
<span class="go">'The pretty representation is 1.3 meter/second²'</span>
<span class="gp">>>> </span><span class="c1"># Latex print</span>
<span class="gp">>>> </span><span class="s1">'The latex representation is {:L}'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">accel</span><span class="p">)</span>
<span class="go">'The latex representation is 1.3 \\frac{meter}{second^{2}}'</span>
<span class="gp">>>> </span><span class="c1"># HTML print</span>
<span class="gp">>>> </span><span class="s1">'The HTML representation is {:H}'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">accel</span><span class="p">)</span>
<span class="go">'The HTML representation is 1.3 meter/second<sup>2</sup>'</span>
</pre></div>
</div>
<p>If you want to use abbreviated unit names, suffix the specification with <cite>~</cite>:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="s1">'The str is {:~}'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">accel</span><span class="p">)</span>
<span class="go">'The str is 1.3 m / s ** 2'</span>
</pre></div>
</div>
<p>The same is true for latex (<cite>L</cite>), pretty (<cite>P</cite>) and HTML (<cite>H</cite>) specs.</p>
<p>Finally, you can specify a default format specification:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="s1">'The acceleration is {}'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">accel</span><span class="p">)</span>
<span class="go">'The acceleration is 1.3 meter / second ** 2'</span>
<span class="gp">>>> </span><span class="n">ureg</span><span class="o">.</span><span class="n">default_format</span> <span class="o">=</span> <span class="s1">'P'</span>
<span class="gp">>>> </span><span class="s1">'The acceleration is {}'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">accel</span><span class="p">)</span>
<span class="go">'The acceleration is 1.3 meter/second²'</span>
</pre></div>
</div>
</div>
<div class="section" id="using-pint-in-your-projects">
<h2>Using Pint in your projects<a class="headerlink" href="#using-pint-in-your-projects" title="Permalink to this headline">¶</a></h2>
<p>If you use Pint in multiple modules within you Python package, you normally want to avoid creating multiple instances of the unit registry.
The best way to do this is by instantiating the registry in a single place. For example, you can add the following code to your package <cite>__init__.py</cite>:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">pint</span> <span class="kn">import</span> <span class="n">UnitRegistry</span>
<span class="n">ureg</span> <span class="o">=</span> <span class="n">UnitRegistry</span><span class="p">()</span>
<span class="n">Q_</span> <span class="o">=</span> <span class="n">ureg</span><span class="o">.</span><span class="n">Quantity</span>
</pre></div>
</div>
<p>Then in <cite>yourmodule.py</cite> the code would be:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">.</span> <span class="kn">import</span> <span class="n">ureg</span><span class="p">,</span> <span class="n">Q_</span>
<span class="n">length</span> <span class="o">=</span> <span class="mi">10</span> <span class="o">*</span> <span class="n">ureg</span><span class="o">.</span><span class="n">meter</span>
<span class="n">my_speed</span> <span class="o">=</span> <span class="n">Quantity</span><span class="p">(</span><span class="mi">20</span><span class="p">,</span> <span class="s1">'m/s'</span><span class="p">)</span>
</pre></div>
</div>
<div class="admonition warning">
<p class="first admonition-title">Warning</p>
<p>There are no global units in Pint. All units belong to a registry and you can have multiple registries instantiated at the same time. However, you are not supposed to operate between quantities that belong to different registries. Never do things like this:</p>
<div class="last highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="n">q1</span> <span class="o">=</span> <span class="n">UnitRegistry</span><span class="p">()</span><span class="o">.</span><span class="n">meter</span>
<span class="gp">>>> </span><span class="n">q2</span> <span class="o">=</span> <span class="n">UnitRegistry</span><span class="p">()</span><span class="o">.</span><span class="n">meter</span>
<span class="gp">>>> </span><span class="c1"># q1 and q2 belong to different registries!</span>
<span class="gp">>>> </span><span class="nb">id</span><span class="p">(</span><span class="n">q1</span><span class="o">.</span><span class="n">_REGISTRY</span><span class="p">)</span> <span class="ow">is</span> <span class="nb">id</span><span class="p">(</span><span class="n">q2</span><span class="o">.</span><span class="n">_REGISTRY</span><span class="p">)</span> <span class="c1"># False</span>
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