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<h1>Python: introduzione</h1>
</div>
</div>
<div class="presentation">
<div class="slide" id="slide0">
<h1 class="title">Python: introduzione</h1>
</div>
<div class="slide" id="cos-e">
<h1>Cos'è</h1>
<p>È un linguaggio di programmazione interpretato, molto flessibile adatto a diversi tipi di applicazione.</p>
</div>
<div class="slide" id="storia">
<h1>Storia</h1>
<p>Python nasce intorno al 1990 ad opera di Guido van Rossum presso lo Stichting Mathematisch Centrum (CWI) in Olanda.</p>
</div>
<div class="slide" id="avviare-l-interprete">
<h1>Avviare l'interprete</h1>
<div class="highlight"><pre><span class="nv">$ </span>python
</pre></div>
<p>oppure:</p>
<div class="highlight"><pre><span class="nv">$ </span>sudo apt-get install python-pip
<span class="nv">$ </span>sudo pip install ipython
<span class="nv">$ </span>ipython
</pre></div>
</div>
<div class="slide" id="sintassi">
<h1>Sintassi</h1>
<p>Separatore dei comandi:</p>
<blockquote>
<ul class="simple">
<li>a capo</li>
<li>; (usato di rado)</li>
</ul>
</blockquote>
<p>I commenti</p>
<div class="highlight"><pre><span class="o">>>></span> <span class="c"># Questo è un commento</span>
<span class="o">>>></span> <span class="n">a</span> <span class="o">=</span> <span class="mi">1</span> <span class="c"># questo è un altro</span>
</pre></div>
</div>
<div class="slide" id="variabili">
<h1>Variabili</h1>
<blockquote>
<ul class="simple">
<li>variabili a tipizzazione dinamica</li>
<li>sono riferimenti ad oggetti</li>
</ul>
</blockquote>
</div>
<div class="slide" id="sintassi-assegnazione">
<h1>Sintassi: assegnazione</h1>
<p>Assegnazione valori:</p>
<div class="highlight"><pre><span class="o">>>></span> <span class="n">a</span> <span class="o">=</span> <span class="mi">1</span>
<span class="o">>>></span> <span class="n">b</span> <span class="o">=</span> <span class="s">"Ciao"</span>
<span class="o">>>></span> <span class="k">print</span> <span class="n">a</span>
<span class="mi">1</span>
<span class="o">>>></span> <span class="k">print</span> <span class="n">b</span>
<span class="n">Ciao</span>
<span class="o">>>></span> <span class="c"># Boolean</span>
<span class="o">>>></span> <span class="n">vero</span> <span class="o">=</span> <span class="bp">True</span>
<span class="o">>>></span> <span class="n">falso</span> <span class="o">=</span> <span class="bp">False</span>
<span class="o">>>></span> <span class="n">boh</span> <span class="o">=</span> <span class="bp">None</span> <span class="c"># non definito</span>
<span class="o">>>></span> <span class="n">vero</span> <span class="ow">and</span> <span class="n">falso</span>
<span class="bp">False</span>
<span class="o">>>></span> <span class="p">(</span><span class="n">vero</span> <span class="ow">or</span> <span class="n">falso</span><span class="p">)</span> <span class="o">==</span> <span class="n">vero</span>
<span class="bp">True</span>
</pre></div>
</div>
<div class="slide" id="numeri-e-stringhe">
<h1>Numeri e stringhe</h1>
<p>Sono immutabili!</p>
<div class="highlight"><pre><span class="o">>>></span> <span class="n">a</span> <span class="o">=</span> <span class="s">"ciao"</span>
<span class="o">>>></span> <span class="n">b</span> <span class="o">=</span> <span class="n">a</span>
<span class="o">>>></span> <span class="n">b</span>
<span class="s">"Ciao"</span>
<span class="o">>>></span> <span class="n">a</span> <span class="o">=</span> <span class="s">"olà"</span>
<span class="o">>>></span> <span class="n">b</span>
<span class="s">"Ciao"</span>
</pre></div>
</div>
<div class="slide" id="controllo-di-flusso">
<h1>Controllo di flusso</h1>
<p>I blocchi di codice sono introdotti dal simbolo <em>:</em> e indentati</p>
<div class="highlight"><pre><span class="o">>>></span> <span class="k">if</span> <span class="p">(</span><span class="bp">True</span> <span class="ow">or</span> <span class="bp">False</span><span class="p">):</span>
<span class="k">print</span> <span class="s">"Ovvio!"</span>
<span class="n">Ovvio</span><span class="err">!</span>
<span class="o">>>></span> <span class="n">i</span> <span class="o">=</span> <span class="mi">0</span>
<span class="o">>>></span> <span class="k">while</span> <span class="n">i</span> <span class="o"><</span> <span class="mi">10</span><span class="p">:</span>
<span class="n">i</span> <span class="o">+=</span> <span class="mi">1</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">i</span> <span class="o">%</span> <span class="mi">2</span><span class="p">:</span>
<span class="k">print</span> <span class="s">"dispari"</span>
<span class="k">print</span> <span class="n">i</span>
</pre></div>
</div>
<div class="slide" id="importare-le-librerie">
<h1>Importare le librerie</h1>
<div class="highlight"><pre><span class="o">>>></span> <span class="kn">import</span> <span class="nn">sys</span>
<span class="o">>>></span> <span class="kn">from</span> <span class="nn">sys</span> <span class="kn">import</span> <span class="n">path</span>
<span class="o">>>></span> <span class="kn">from</span> <span class="nn">sys</span> <span class="kn">import</span> <span class="o">*</span>
</pre></div>
</div>
<div class="slide" id="librerie">
<h1>Librerie</h1>
<blockquote>
<ul class="simple">
<li>su <a class="reference external" href="http://pypi.python.org/pypi">http://pypi.python.org/pypi</a></li>
<li>pip search ....</li>
<li>sudo pip install ...</li>
</ul>
</blockquote>
</div>
<div class="slide" id="creare-uno-script">
<h1>Creare uno script</h1>
<div class="highlight"><pre><span class="c">#!/usr/bin/env python</span>
<span class="kn">import</span> <span class="nn">sys</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">sys</span><span class="o">.</span><span class="n">argv</span><span class="p">)</span> <span class="o"><</span> <span class="mi">2</span><span class="p">:</span>
<span class="k">print</span> <span class="s">"Uso: </span><span class="si">%s</span><span class="s"> nome_del_file</span><span class="se">\n</span><span class="s">"</span> <span class="o">%</span> <span class="n">sys</span><span class="o">.</span><span class="n">argv</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
<span class="n">sys</span><span class="o">.</span><span class="n">exit</span><span class="p">()</span>
<span class="n">nome_file</span> <span class="o">=</span> <span class="n">sys</span><span class="o">.</span><span class="n">argv</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">isfile</span><span class="p">(</span><span class="n">nome_file</span><span class="p">):</span>
<span class="n">sys</span><span class="o">.</span><span class="n">exit</span><span class="p">(</span><span class="s">"Il file </span><span class="si">%s</span><span class="s"> non esiste</span><span class="se">\n</span><span class="s">"</span> <span class="o">%</span> <span class="n">nome_file</span><span class="p">)</span>
</pre></div>
</div>
<div class="slide" id="le-liste">
<h1>Le liste</h1>
<blockquote>
<ul class="simple">
<li>list</li>
<li>tuple</li>
<li>dict</li>
<li>set</li>
<li>frozenset</li>
</ul>
</blockquote>
</div>
<div class="slide" id="le-funzioni">
<h1>Le funzioni</h1>
<p>Le funzioni possono essere definite dinamicamente e anche annidate:</p>
<div class="highlight"><pre><span class="o">>>></span> <span class="k">def</span> <span class="nf">f</span><span class="p">(</span><span class="n">x</span><span class="p">):</span>
<span class="o">...</span> <span class="k">def</span> <span class="nf">f2</span><span class="p">(</span><span class="n">x</span><span class="p">):</span>
<span class="o">...</span> <span class="k">return</span> <span class="n">x</span> <span class="o">+</span> <span class="mi">1</span>
<span class="o">...</span> <span class="k">return</span> <span class="n">f2</span><span class="p">(</span><span class="n">x</span><span class="o">*</span><span class="mi">2</span><span class="p">)</span>
<span class="o">...</span>
<span class="o">>>></span> <span class="n">f</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
<span class="mi">3</span>
</pre></div>
</div>
<div class="slide" id="le-funzioni-passaggio-di-parametri">
<h1>Le funzioni: passaggio di parametri</h1>
<p>Il passaggio è sempre per valore:</p>
<div class="highlight"><pre><span class="o">>>></span> <span class="k">def</span> <span class="nf">f</span><span class="p">(</span><span class="n">x</span><span class="p">):</span>
<span class="o">...</span> <span class="n">x</span><span class="o">+=</span><span class="mi">1</span>
<span class="o">...</span>
<span class="o">>>></span> <span class="n">x</span><span class="o">=</span><span class="mi">1</span>
<span class="o">>>></span> <span class="n">f</span><span class="p">(</span><span class="n">x</span><span class="p">)</span>
<span class="o">>>></span> <span class="n">x</span>
<span class="mi">1</span>
</pre></div>
<p><cite>x</cite> non viene modificato!</p>
</div>
<div class="slide" id="le-funzioni-argomenti-posizionali">
<h1>Le funzioni: argomenti posizionali</h1>
<div class="highlight"><pre><span class="o">>>></span> <span class="k">def</span> <span class="nf">f</span><span class="p">(</span><span class="n">x1</span><span class="p">,</span> <span class="n">x2</span><span class="p">):</span>
<span class="o">...</span> <span class="k">return</span> <span class="n">x1</span> <span class="o">+</span> <span class="n">x2</span>
<span class="o">...</span>
<span class="o">>>></span> <span class="n">f</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">)</span>
<span class="mi">3</span>
<span class="c"># passaggio di una tupla</span>
<span class="o">>>></span> <span class="n">t</span> <span class="o">=</span> <span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">)</span>
<span class="c"># l'asterisco espande la tupla</span>
<span class="o">>>></span> <span class="n">f</span><span class="p">(</span><span class="o">*</span><span class="n">t</span><span class="p">)</span>
<span class="mi">5</span>
<span class="o">>>></span> <span class="k">def</span> <span class="nf">f</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">):</span>
<span class="o">...</span> <span class="k">return</span> <span class="n">args</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">+</span> <span class="n">args</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span>
<span class="o">...</span>
<span class="o">>>></span> <span class="n">f</span><span class="p">(</span><span class="o">*</span><span class="n">t</span><span class="p">)</span>
<span class="mi">5</span>
</pre></div>
</div>
<div class="slide" id="le-funzioni-argomenti-chiave">
<h1>Le funzioni: argomenti chiave</h1>
<div class="highlight"><pre><span class="o">>>></span> <span class="k">def</span> <span class="nf">f</span><span class="p">(</span><span class="n">x1</span><span class="p">,</span> <span class="n">x2</span><span class="p">):</span>
<span class="o">...</span> <span class="k">return</span> <span class="n">x1</span> <span class="o">+</span> <span class="n">x2</span>
<span class="o">...</span>
<span class="o">>>></span> <span class="n">f</span><span class="p">(</span><span class="n">x2</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span> <span class="n">x1</span><span class="o">=</span><span class="mi">0</span><span class="p">)</span>
<span class="mi">2</span>
<span class="c"># Argomenti con valori di default</span>
<span class="o">>>></span> <span class="k">def</span> <span class="nf">f</span><span class="p">(</span><span class="n">x1</span><span class="p">,</span> <span class="n">x2</span><span class="o">=</span><span class="mi">1</span><span class="p">):</span>
<span class="o">...</span> <span class="k">return</span> <span class="n">x1</span> <span class="o">+</span> <span class="n">x2</span>
<span class="o">...</span>
<span class="o">>>></span> <span class="n">f</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
<span class="mi">2</span>
</pre></div>
</div>
<div class="slide" id="le-classi">
<h1>Le classi</h1>
<p>Le classi sono le fabbriche degli oggetti.</p>
<div class="highlight"><pre><span class="o">>>></span> <span class="k">class</span> <span class="nc">a</span><span class="p">:</span>
<span class="o">...</span> <span class="n">v</span> <span class="o">=</span> <span class="mi">0</span>
<span class="o">...</span>
<span class="o">>>></span> <span class="n">a</span>
<span class="o"><</span><span class="k">class</span> <span class="nc">__main__</span><span class="o">.</span><span class="n">a</span> <span class="n">at</span> <span class="mh">0x1c91940</span><span class="o">></span>
<span class="o">>>></span> <span class="n">b</span> <span class="o">=</span> <span class="n">a</span><span class="p">()</span>
<span class="o">>>></span> <span class="n">b</span>
<span class="o"><</span><span class="n">__main__</span><span class="o">.</span><span class="n">a</span> <span class="n">instance</span> <span class="n">at</span> <span class="mh">0x1ca6cf8</span><span class="o">></span>
<span class="o">>>></span> <span class="n">c</span> <span class="o">=</span> <span class="n">b</span>
<span class="o">>>></span> <span class="n">c</span>
<span class="o"><</span><span class="n">__main__</span><span class="o">.</span><span class="n">a</span> <span class="n">instance</span> <span class="n">at</span> <span class="mh">0x1ca6cf8</span><span class="o">></span>
<span class="o">>>></span>
</pre></div>
</div>
<div class="slide" id="classi-e-oggetti">
<h1>Classi e Oggetti</h1>
<p>Le classi sono lo stampo. Gli oggetti il prodotto finito.</p>
<div class="highlight"><pre><span class="o">>>></span> <span class="k">class</span> <span class="nc">Auto</span><span class="p">:</span>
<span class="o">...</span> <span class="n">marca</span> <span class="o">=</span> <span class="s">''</span>
<span class="o">...</span> <span class="n">modello</span> <span class="o">=</span> <span class="s">''</span>
<span class="o">...</span>
<span class="o">>>></span> <span class="n">punto</span> <span class="o">=</span> <span class="n">Auto</span><span class="p">()</span>
<span class="o">>>></span> <span class="n">punto</span><span class="o">.</span><span class="n">marca</span> <span class="o">=</span> <span class="s">'FIAT'</span>
<span class="o">>>></span> <span class="n">punto</span><span class="o">.</span><span class="n">modello</span> <span class="o">=</span> <span class="s">'Punto 1.2'</span>
<span class="o">>>></span> <span class="n">punto</span>
<span class="o"><</span><span class="n">__main__</span><span class="o">.</span><span class="n">Auto</span> <span class="n">instance</span> <span class="n">at</span> <span class="mh">0x105cc7680</span><span class="o">></span>
<span class="o">>>></span> <span class="nb">dir</span><span class="p">(</span><span class="n">punto</span><span class="p">)</span>
<span class="p">[</span><span class="s">'__doc__'</span><span class="p">,</span> <span class="s">'__module__'</span><span class="p">,</span> <span class="s">'marca'</span><span class="p">,</span> <span class="s">'modello'</span><span class="p">]</span>
<span class="o">>>></span> <span class="n">punto</span><span class="o">.</span><span class="n">marca</span>
<span class="s">'FIAT'</span>
<span class="o">>>></span>
</pre></div>
</div>
<div class="slide" id="i-metodi">
<h1>I metodi</h1>
<p>I metodi sono le azioni che i nostri oggetti possono compiere.</p>
<div class="highlight"><pre><span class="o">>>></span> <span class="k">class</span> <span class="nc">Auto</span><span class="p">:</span>
<span class="o">...</span> <span class="n">marca</span> <span class="o">=</span> <span class="s">''</span>
<span class="o">...</span> <span class="n">modello</span> <span class="o">=</span> <span class="s">''</span>
<span class="o">...</span> <span class="k">def</span> <span class="nf">accenditi</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="o">...</span> <span class="k">print</span> <span class="s">"accendo: </span><span class="si">%s</span><span class="s"> </span><span class="si">%s</span><span class="s">"</span> <span class="o">%</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">marca</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">modello</span><span class="p">)</span>
<span class="o">...</span>
<span class="o">>>></span> <span class="n">punto</span> <span class="o">=</span> <span class="n">Auto</span><span class="p">()</span>
<span class="o">>>></span> <span class="n">punto</span><span class="o">.</span><span class="n">marca</span> <span class="o">=</span> <span class="s">'FIAT'</span>
<span class="o">>>></span> <span class="n">punto</span><span class="o">.</span><span class="n">modello</span> <span class="o">=</span> <span class="s">'Punto 1.2'</span>
<span class="o">>>></span>
<span class="o">>>></span> <span class="n">punto</span><span class="o">.</span><span class="n">accenditi</span><span class="p">()</span>
<span class="n">accendo</span><span class="p">:</span> <span class="n">FIAT</span> <span class="n">Punto</span> <span class="mf">1.2</span>
<span class="o">>>></span>
</pre></div>
</div>
<div class="slide" id="id1">
<h1>I metodi</h1>
<p>I metodi possono ovviamente ricevere dei parametri.</p>
<div class="highlight"><pre><span class="o">>>></span> <span class="k">class</span> <span class="nc">Auto</span><span class="p">:</span>
<span class="o">...</span> <span class="n">marca</span> <span class="o">=</span> <span class="s">''</span>
<span class="o">...</span> <span class="n">modello</span> <span class="o">=</span> <span class="s">''</span>
<span class="o">...</span> <span class="k">def</span> <span class="nf">azione</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">azione</span><span class="p">):</span>
<span class="o">...</span> <span class="k">print</span> <span class="s">"azione: </span><span class="si">%s</span><span class="s"> </span><span class="si">%s</span><span class="s"> </span><span class="si">%s</span><span class="s">"</span> <span class="o">%</span> <span class="p">(</span><span class="n">azione</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">marca</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">modello</span><span class="p">)</span>
<span class="o">...</span>
<span class="o">>>></span> <span class="n">punto</span> <span class="o">=</span> <span class="n">Auto</span><span class="p">()</span>
<span class="o">>>></span> <span class="n">punto</span><span class="o">.</span><span class="n">marca</span> <span class="o">=</span> <span class="s">'FIAT'</span>
<span class="o">>>></span> <span class="n">punto</span><span class="o">.</span><span class="n">modello</span> <span class="o">=</span> <span class="s">'Punto 1.2'</span>
<span class="o">>>></span>
<span class="o">>>></span> <span class="n">punto</span><span class="o">.</span><span class="n">azione</span><span class="p">(</span><span class="s">'accendo'</span><span class="p">)</span>
<span class="n">azione</span><span class="p">:</span> <span class="n">accendo</span> <span class="n">FIAT</span> <span class="n">Punto</span> <span class="mf">1.2</span>
<span class="o">>>></span>
</pre></div>
</div>
<div class="slide" id="ereditarieta">
<h1>Ereditarietà</h1>
<p>Possiamo creare una classe che "eredita" da un'altra.</p>
<blockquote>
<pre class="doctest-block">
>>> class Berlina(Auto):
... porte = 4
...
>>> bravo = Berlina()
>>> bravo.porte
4
>>> bravo.marca = 'FIAT?
>>> bravo.marca = 'FIAT'
>>> dir(bravo)
['__doc__', '__module__', 'azione', 'marca', 'modello', 'porte']
>>>
</pre>
</blockquote>
</div>
<div class="slide" id="interfacce-grafiche-con-qt">
<h1>Interfacce grafiche con Qt</h1>
<p>Installare QtDesigner e PyQt4:</p>
<div class="highlight"><pre><span class="nv">$ </span>sudo apt-get install qt4-designer python-qt4
</pre></div>
<div class="highlight"><pre><span class="kn">import</span> <span class="nn">sys</span>
<span class="kn">from</span> <span class="nn">PyQt4</span> <span class="kn">import</span> <span class="n">Qt</span>
<span class="c"># We instantiate a QApplication passing the arguments of the script to it:</span>
<span class="n">a</span> <span class="o">=</span> <span class="n">Qt</span><span class="o">.</span><span class="n">QApplication</span><span class="p">(</span><span class="n">sys</span><span class="o">.</span><span class="n">argv</span><span class="p">)</span>
<span class="c"># Add a basic widget to this application:</span>
<span class="c"># The first argument is the text we want this QWidget to show, the second</span>
<span class="c"># one is the parent widget. Since Our "hello" is the only thing we use (the</span>
<span class="c"># so-called "MainWidget", it does not have a parent.</span>
<span class="n">hello</span> <span class="o">=</span> <span class="n">Qt</span><span class="o">.</span><span class="n">QLabel</span><span class="p">(</span><span class="s">"Hello, World"</span><span class="p">)</span>
<span class="c"># ... and that it should be shown.</span>
<span class="n">hello</span><span class="o">.</span><span class="n">show</span><span class="p">()</span>
<span class="c"># Now we can start it.</span>
<span class="n">a</span><span class="o">.</span><span class="n">exec_</span><span class="p">()</span>
</pre></div>
</div>
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