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<div class="section" id="pyqt4-and-python-v3">
<h1>PyQt4 and Python v3<a class="headerlink" href="#pyqt4-and-python-v3" title="Permalink to this headline">¶</a></h1>
<p>PyQt4 fully supports all versions of Python v3. The default behaviour is
different in some areas to the default behaviour with Python v2. These
incompatible differences were introduced in order to make PyQt4 more Pythonic.
However it is very easy to revert to the default Python v2 behaviour on a class
by class basis if required. (See the section <a class="reference internal" href="incompatible_apis.html#ref-incompat-apis"><span>Selecting Incompatible APIs</span></a>.)</p>
<div class="section" id="qabstractspinbox">
<h2>QAbstractSpinBox<a class="headerlink" href="#qabstractspinbox" title="Permalink to this headline">¶</a></h2>
<p>The following PyQt4 calls have changed signatures to avoid the need for mutable
strings:</p>
<div class="highlight-python"><div class="highlight"><pre>QAbstractSpinBox.fixup(str input) -> str
QAbstractSpinBox.validate(str input, int pos) -> QValidator.State, str, int
</pre></div>
</div>
</div>
<div class="section" id="qchar">
<h2>QChar<a class="headerlink" href="#qchar" title="Permalink to this headline">¶</a></h2>
<p>The <code class="docutils literal"><span class="pre">QChar</span></code> class is implemented as a mapped type that is automatically
converted to and from a Python string.</p>
</div>
<div class="section" id="qclipboard">
<h2>QClipboard<a class="headerlink" href="#qclipboard" title="Permalink to this headline">¶</a></h2>
<p>The following PyQt4 call has a changed signature to avoid the need for mutable
strings:</p>
<div class="highlight-python"><div class="highlight"><pre>QClipboard.text(str subtype, QClipboard.Mode mode=QClipboard.Clipboard) -> str, str
</pre></div>
</div>
</div>
<div class="section" id="qdate">
<h2>QDate<a class="headerlink" href="#qdate" title="Permalink to this headline">¶</a></h2>
<p>The <code class="docutils literal"><span class="pre">QDate.__hash__()</span></code> returns a hash of the string representation so that
two objects with the same date will have the same hash.</p>
<p>The default behaviour with Python v2 is to return the object’s <code class="docutils literal"><span class="pre">id()</span></code> so that
two objects with the same date will have different hashes.</p>
</div>
<div class="section" id="qdatetime">
<h2>QDateTime<a class="headerlink" href="#qdatetime" title="Permalink to this headline">¶</a></h2>
<p>The <code class="docutils literal"><span class="pre">QDateTime.__hash__()</span></code> method returns a hash of the string representation
so that two objects with the same date and time will have the same hash.</p>
<p>The default behaviour with Python v2 is to return the object’s <code class="docutils literal"><span class="pre">id()</span></code> so that
two objects with the same date and time will have different hashes.</p>
</div>
<div class="section" id="qdatetimeedit">
<h2>QDateTimeEdit<a class="headerlink" href="#qdatetimeedit" title="Permalink to this headline">¶</a></h2>
<p>The following PyQt4 calls have changed signatures to avoid the need for mutable
strings:</p>
<div class="highlight-python"><div class="highlight"><pre>QDateTimeEdit.fixup(str input) -> str
QDateTimeEdit.validate(str input, int pos) -> QValidator.State, str, int
</pre></div>
</div>
</div>
<div class="section" id="qdoublespinbox">
<h2>QDoubleSpinBox<a class="headerlink" href="#qdoublespinbox" title="Permalink to this headline">¶</a></h2>
<p>The following PyQt4 calls have changed signatures to avoid the need for mutable
strings:</p>
<div class="highlight-python"><div class="highlight"><pre>QDoubleSpinBox.fixup(str input) -> str
QDoubleSpinBox.validate(str input, int pos) -> QValidator.State, str, int
</pre></div>
</div>
</div>
<div class="section" id="qdoublevalidator">
<h2>QDoubleValidator<a class="headerlink" href="#qdoublevalidator" title="Permalink to this headline">¶</a></h2>
<p>The following PyQt4 call has a changed signature to avoid the need for mutable
strings:</p>
<div class="highlight-python"><div class="highlight"><pre>QDoubleValidator.validate(str input, int pos) -> QValidator.State, str, int
</pre></div>
</div>
</div>
<div class="section" id="qfiledialog">
<h2>QFileDialog<a class="headerlink" href="#qfiledialog" title="Permalink to this headline">¶</a></h2>
<p>The following PyQt4 calls have changed signatures to avoid the need for mutable
strings:</p>
<div class="highlight-python"><div class="highlight"><pre>QFileDialog.getOpenFileName(QWidget parent=None, str caption=None, str dir=None, str filter=None, QFileDialog.Options options=0) -> str
QFileDialog.getOpenFileNames(QWidget parent=None, str caption=None, str dir=None, str filter=None, QFileDialog.Options options=0) -> list(str)
QFileDialog.getSaveFileName(QWidget parent=None, str caption=None, str dir=None, str filter=None, QFileDialog.Options options=0) -> str
</pre></div>
</div>
<p>The static methods <code class="docutils literal"><span class="pre">QFileDialog.getOpenFileNameAndFilter()</span></code>,
<code class="docutils literal"><span class="pre">QFileDialog.getOpenFileNamesAndFilter()</span></code> and
<code class="docutils literal"><span class="pre">QFileDialog.getSaveFileNameAndFilter()</span></code> have been added which return a tuple
of the name(s) and the selected filter. These can also be used with Python v2.</p>
</div>
<div class="section" id="qfontmetrics">
<h2>QFontMetrics<a class="headerlink" href="#qfontmetrics" title="Permalink to this headline">¶</a></h2>
<p>The methods <code class="docutils literal"><span class="pre">QFontMetrics.widthChar()</span></code> and
<code class="docutils literal"><span class="pre">QFontMetrics.boundingRectChar()</span></code> have been added which accept a Python
string of length one and call the C++ <code class="docutils literal"><span class="pre">QFontMetrics::width()</span></code> and
<code class="docutils literal"><span class="pre">QFontMetrics::boundingRect()</span></code> methods passing the character as a <code class="docutils literal"><span class="pre">QChar</span></code>
(rather than a single character <code class="docutils literal"><span class="pre">QString</span></code>).</p>
</div>
<div class="section" id="qfontmetricsf">
<h2>QFontMetricsF<a class="headerlink" href="#qfontmetricsf" title="Permalink to this headline">¶</a></h2>
<p>The methods <code class="docutils literal"><span class="pre">QFontMetricsF.widthChar()</span></code> and
<code class="docutils literal"><span class="pre">QFontMetricsF.boundingRectChar()</span></code> have been added which accept a Python
string of length one and call the C++ <code class="docutils literal"><span class="pre">QFontMetricsF::width()</span></code> and
<code class="docutils literal"><span class="pre">QFontMetricsF::boundingRect()</span></code> methods passing the character as a <code class="docutils literal"><span class="pre">QChar</span></code>
(rather than a single character <code class="docutils literal"><span class="pre">QString</span></code>).</p>
</div>
<div class="section" id="qintvalidator">
<h2>QIntValidator<a class="headerlink" href="#qintvalidator" title="Permalink to this headline">¶</a></h2>
<p>The following PyQt4 call has a changed signature to avoid the need for mutable
strings:</p>
<div class="highlight-python"><div class="highlight"><pre>QIntValidator.validate(str input, int pos) -> QValidator.State, str, int
</pre></div>
</div>
</div>
<div class="section" id="qlatin1char">
<h2>QLatin1Char<a class="headerlink" href="#qlatin1char" title="Permalink to this headline">¶</a></h2>
<p>The <code class="docutils literal"><span class="pre">QLatin1Char</span></code> class is not implemented.</p>
</div>
<div class="section" id="qlatin1string">
<h2>QLatin1String<a class="headerlink" href="#qlatin1string" title="Permalink to this headline">¶</a></h2>
<p>The <code class="docutils literal"><span class="pre">QLatin1String</span></code> class is not implemented.</p>
</div>
<div class="section" id="qpynullvariant">
<h2>QPyNullVariant<a class="headerlink" href="#qpynullvariant" title="Permalink to this headline">¶</a></h2>
<p>The <code class="docutils literal"><span class="pre">QPyNullVariant</span></code> class is used to represent a null <code class="docutils literal"><span class="pre">QVariant</span></code>. It is
automatically converted to a C++ <code class="docutils literal"><span class="pre">QVariant</span></code> when required.</p>
<p>A null C++ <code class="docutils literal"><span class="pre">QVariant</span></code> is automatically converted to a <code class="docutils literal"><span class="pre">QPyNullVariant</span></code>
unless the type of the data in the <code class="docutils literal"><span class="pre">QVariant</span></code> itself supports the concept of
a null value (i.e. it has an <code class="docutils literal"><span class="pre">isNull()</span></code> method). In this case a null C++
<code class="docutils literal"><span class="pre">QVariant</span></code> is converted to a null instance of the data type. The exception
to this rule is that a C++ <code class="docutils literal"><span class="pre">QVariant</span></code> containing a null <code class="docutils literal"><span class="pre">QString</span></code> is always
converted to a <code class="docutils literal"><span class="pre">QPyNullVariant</span></code>.</p>
</div>
<div class="section" id="qregexpvalidator">
<h2>QRegExpValidator<a class="headerlink" href="#qregexpvalidator" title="Permalink to this headline">¶</a></h2>
<p>The following PyQt4 call has a changed signature to avoid the need for mutable
strings:</p>
<div class="highlight-python"><div class="highlight"><pre>QRegExpValidator.validate(str input, int pos) -> QValidator.State, str, int
</pre></div>
</div>
</div>
<div class="section" id="qsettings">
<h2>QSettings<a class="headerlink" href="#qsettings" title="Permalink to this headline">¶</a></h2>
<p>The <code class="docutils literal"><span class="pre">QSettings.value()</span></code> method takes an optional <code class="docutils literal"><span class="pre">type</span></code> keyword argument
that specifies the type of the value to return. It can either be a Python type
object or a string specifying the name of a C++ type.</p>
<p>Using this argument avoids potential portability problems where the type of a
value may not be as expected because the platform specific backend to
<code class="docutils literal"><span class="pre">QSettings</span></code> may not store the necessary type information.</p>
<p>The argument can also be used with Python v2.</p>
</div>
<div class="section" id="qspinbox">
<h2>QSpinBox<a class="headerlink" href="#qspinbox" title="Permalink to this headline">¶</a></h2>
<p>The following PyQt4 calls have changed signatures to avoid the need for mutable
strings:</p>
<div class="highlight-python"><div class="highlight"><pre>QSpinBox.fixup(str input) -> str
QSpinBox.validate(str input, int pos) -> QValidator.State, str, int
</pre></div>
</div>
</div>
<div class="section" id="qstring">
<h2>QString<a class="headerlink" href="#qstring" title="Permalink to this headline">¶</a></h2>
<p>The <code class="docutils literal"><span class="pre">QString</span></code> class is implemented as a mapped type that is automatically
converted to and from a Python string. In addition a <code class="docutils literal"><span class="pre">None</span></code> is converted to
a null <code class="docutils literal"><span class="pre">QString</span></code>. However, a null <code class="docutils literal"><span class="pre">QString</span></code> is converted to an empty
Python string (and not <code class="docutils literal"><span class="pre">None</span></code>). (This is because Qt often returns a null
<code class="docutils literal"><span class="pre">QString</span></code> when it should probably return an empty <code class="docutils literal"><span class="pre">QString</span></code>.)</p>
</div>
<div class="section" id="qstringlist">
<h2>QStringList<a class="headerlink" href="#qstringlist" title="Permalink to this headline">¶</a></h2>
<p>The <code class="docutils literal"><span class="pre">QStringList</span></code> class is implemented as a mapped type that is
automatically converted to and from a Python list of strings.</p>
</div>
<div class="section" id="qstringmatcher">
<h2>QStringMatcher<a class="headerlink" href="#qstringmatcher" title="Permalink to this headline">¶</a></h2>
<p>The <code class="docutils literal"><span class="pre">QStringMatcher</span></code> class is not implemented.</p>
</div>
<div class="section" id="qstringref">
<h2>QStringRef<a class="headerlink" href="#qstringref" title="Permalink to this headline">¶</a></h2>
<p>The <code class="docutils literal"><span class="pre">QStringRef</span></code> class is implemented as a mapped type that is automatically
converted to and from a Python string.</p>
</div>
<div class="section" id="qtextdecoder">
<h2>QTextDecoder<a class="headerlink" href="#qtextdecoder" title="Permalink to this headline">¶</a></h2>
<p>The following C++ call is not wrapped because it expects <code class="docutils literal"><span class="pre">QString</span></code> to be
mutable:</p>
<div class="highlight-python"><div class="highlight"><pre>void toUnicode(QString *target, const char *chars, int len)
</pre></div>
</div>
</div>
<div class="section" id="qtextstream">
<h2>QTextStream<a class="headerlink" href="#qtextstream" title="Permalink to this headline">¶</a></h2>
<p>The C++ functions <code class="docutils literal"><span class="pre">bin()</span></code>, <code class="docutils literal"><span class="pre">hex()</span></code> and <code class="docutils literal"><span class="pre">oct()</span></code> are named <code class="docutils literal"><span class="pre">bin_()</span></code>,
<code class="docutils literal"><span class="pre">hex_()</span></code> and <code class="docutils literal"><span class="pre">oct_()</span></code> respectively in Python. This allows the import
style <code class="docutils literal"><span class="pre">from</span> <span class="pre">PyQt4.QtCore</span> <span class="pre">import</span> <span class="pre">*</span></code> to be used without them clashing with the
Python built-in functions with the same names.</p>
<p>The following C++ calls are not wrapped because they expect <code class="docutils literal"><span class="pre">QString</span></code> to be
mutable:</p>
<div class="highlight-python"><div class="highlight"><pre>QTextStream(QString *string, QIODevice::OpenMode openMode = QIODevice::ReadWrite)
void setString(QString *string, QIODevice::OpenMode openMode = QIODevice::ReadWrite)
QString *string()
QTextStream &operator>>(QChar &c)
QTextStream &operator>>(QString &s)
</pre></div>
</div>
</div>
<div class="section" id="qtime">
<h2>QTime<a class="headerlink" href="#qtime" title="Permalink to this headline">¶</a></h2>
<p>The <code class="docutils literal"><span class="pre">QTime.__hash__()</span></code> returns a hash of the string representation so that
two objects with the same time will have the same hash.</p>
<p>The default behaviour with Python v2 is to return the object’s <code class="docutils literal"><span class="pre">id()</span></code> so that
two objects with the same time will have different hashes.</p>
</div>
<div class="section" id="qurl">
<h2>QUrl<a class="headerlink" href="#qurl" title="Permalink to this headline">¶</a></h2>
<p>The <code class="docutils literal"><span class="pre">QUrl.__hash__()</span></code> method returns a hash of the string representation so
that two objects with the same URL will have the same hash.</p>
<p>The default behaviour with Python v2 is to return the object’s <code class="docutils literal"><span class="pre">id()</span></code> so that
two objects with the same URL will have different hashes.</p>
</div>
<div class="section" id="qvalidator">
<h2>QValidator<a class="headerlink" href="#qvalidator" title="Permalink to this headline">¶</a></h2>
<p>The following PyQt4 calls have changed signatures to avoid the need for mutable
strings:</p>
<div class="highlight-python"><div class="highlight"><pre>QValidator.fixup(str input) -> str
QValidator.validate(str input, int pos) -> QValidator.State, str, int
</pre></div>
</div>
</div>
<div class="section" id="qvariant">
<h2>QVariant<a class="headerlink" href="#qvariant" title="Permalink to this headline">¶</a></h2>
<p>The <code class="docutils literal"><span class="pre">QVariant</span></code> class is implemented as a mapped type. Any Python object can
be passed when a <code class="docutils literal"><span class="pre">QVariant</span></code> instance is expected. When Qt returns a
<code class="docutils literal"><span class="pre">QVariant</span></code> then it will automatically be converted to the original Python
object or an equivalent.</p>
<p><code class="docutils literal"><span class="pre">None</span></code> is interpreted as an invalid <code class="docutils literal"><span class="pre">QVariant</span></code> and vice versa.</p>
<p>The <code class="docutils literal"><span class="pre">QPyNullVariant</span></code> class is used to represent a null <code class="docutils literal"><span class="pre">QVariant</span></code>.</p>
</div>
<div class="section" id="qwebpage">
<h2>QWebPage<a class="headerlink" href="#qwebpage" title="Permalink to this headline">¶</a></h2>
<p>The following PyQt4 call has a changed signature to avoid the need for mutable
strings:</p>
<div class="highlight-python"><div class="highlight"><pre>QWebPage.javaScriptPrompt(QWebFrame originatingFrame, str msg, str defaultValue) -> bool, str
</pre></div>
</div>
</div>
<div class="section" id="qxmlstreamwriter">
<h2>QXmlStreamWriter<a class="headerlink" href="#qxmlstreamwriter" title="Permalink to this headline">¶</a></h2>
<p>The following C++ call is not wrapped because it expects <code class="docutils literal"><span class="pre">QString</span></code> to be
mutable:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="n">QXmlStreamWriter</span><span class="p">(</span><span class="n">QString</span> <span class="o">*</span><span class="n">string</span><span class="p">)</span>
</pre></div>
</div>
</div>
</div>
</div>
</div>
</div>
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<img class="logo" src="_static/logo.png" alt="Logo"/>
</a></p>
<h3><a href="index.html">Table Of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">PyQt4 and Python v3</a><ul>
<li><a class="reference internal" href="#qabstractspinbox">QAbstractSpinBox</a></li>
<li><a class="reference internal" href="#qchar">QChar</a></li>
<li><a class="reference internal" href="#qclipboard">QClipboard</a></li>
<li><a class="reference internal" href="#qdate">QDate</a></li>
<li><a class="reference internal" href="#qdatetime">QDateTime</a></li>
<li><a class="reference internal" href="#qdatetimeedit">QDateTimeEdit</a></li>
<li><a class="reference internal" href="#qdoublespinbox">QDoubleSpinBox</a></li>
<li><a class="reference internal" href="#qdoublevalidator">QDoubleValidator</a></li>
<li><a class="reference internal" href="#qfiledialog">QFileDialog</a></li>
<li><a class="reference internal" href="#qfontmetrics">QFontMetrics</a></li>
<li><a class="reference internal" href="#qfontmetricsf">QFontMetricsF</a></li>
<li><a class="reference internal" href="#qintvalidator">QIntValidator</a></li>
<li><a class="reference internal" href="#qlatin1char">QLatin1Char</a></li>
<li><a class="reference internal" href="#qlatin1string">QLatin1String</a></li>
<li><a class="reference internal" href="#qpynullvariant">QPyNullVariant</a></li>
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