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<div class="section" id="python-3-faq">
<h1><a class="toc-backref" href="#id1">Python 3 FAQ</a><a class="headerlink" href="#python-3-faq" title="Permalink to this headline">¶</a></h1>
<div class="contents topic" id="contents">
<p class="topic-title first">Contents</p>
<ul class="simple">
<li><a class="reference internal" href="#python-3-faq" id="id1">Python 3 FAQ</a><ul>
<li><a class="reference internal" href="#what-python-3-versions-are-supported" id="id2">What Python 3 versions are supported?</a></li>
<li><a class="reference internal" href="#are-there-any-pymongo-behavior-changes-with-python-3" id="id3">Are there any PyMongo behavior changes with Python 3?</a></li>
<li><a class="reference internal" href="#why-can-t-i-share-pickled-objectids-between-some-versions-of-python-2-and-3" id="id4">Why can’t I share pickled ObjectIds between some versions of Python 2 and 3?</a></li>
</ul>
</li>
</ul>
</div>
<div class="section" id="what-python-3-versions-are-supported">
<h2><a class="toc-backref" href="#id2">What Python 3 versions are supported?</a><a class="headerlink" href="#what-python-3-versions-are-supported" title="Permalink to this headline">¶</a></h2>
<p>PyMongo supports CPython 3.4+ and PyPy3.</p>
</div>
<div class="section" id="are-there-any-pymongo-behavior-changes-with-python-3">
<h2><a class="toc-backref" href="#id3">Are there any PyMongo behavior changes with Python 3?</a><a class="headerlink" href="#are-there-any-pymongo-behavior-changes-with-python-3" title="Permalink to this headline">¶</a></h2>
<p>Only one intentional change. Instances of <code class="xref py py-class docutils literal notranslate"><span class="pre">bytes</span></code>
are encoded as BSON type 5 (Binary data) with subtype 0.
In Python 3 they are decoded back to <code class="xref py py-class docutils literal notranslate"><span class="pre">bytes</span></code>. In
Python 2 they are decoded to <a class="reference internal" href="api/bson/binary.html#bson.binary.Binary" title="bson.binary.Binary"><code class="xref py py-class docutils literal notranslate"><span class="pre">Binary</span></code></a>
with subtype 0.</p>
<p>For example, let’s insert a <code class="xref py py-class docutils literal notranslate"><span class="pre">bytes</span></code> instance using Python 3 then
read it back. Notice the byte string is decoded back to <code class="xref py py-class docutils literal notranslate"><span class="pre">bytes</span></code>:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">Python</span> <span class="mf">3.6</span><span class="o">.</span><span class="mi">1</span> <span class="p">(</span><span class="n">v3</span><span class="o">.</span><span class="mf">6.1</span><span class="p">:</span><span class="mi">69</span><span class="n">c0db5050</span><span class="p">,</span> <span class="n">Mar</span> <span class="mi">21</span> <span class="mi">2017</span><span class="p">,</span> <span class="mi">01</span><span class="p">:</span><span class="mi">21</span><span class="p">:</span><span class="mi">04</span><span class="p">)</span>
<span class="p">[</span><span class="n">GCC</span> <span class="mf">4.9</span><span class="o">.</span><span class="mi">3</span><span class="p">]</span> <span class="n">on</span> <span class="n">linux</span>
<span class="n">Type</span> <span class="s2">"help"</span><span class="p">,</span> <span class="s2">"copyright"</span><span class="p">,</span> <span class="s2">"credits"</span> <span class="ow">or</span> <span class="s2">"license"</span> <span class="k">for</span> <span class="n">more</span> <span class="n">information</span><span class="o">.</span>
<span class="o">>>></span> <span class="kn">import</span> <span class="nn">pymongo</span>
<span class="o">>>></span> <span class="n">c</span> <span class="o">=</span> <span class="n">pymongo</span><span class="o">.</span><span class="n">MongoClient</span><span class="p">()</span>
<span class="o">>>></span> <span class="n">c</span><span class="o">.</span><span class="n">test</span><span class="o">.</span><span class="n">bintest</span><span class="o">.</span><span class="n">insert_one</span><span class="p">({</span><span class="s1">'binary'</span><span class="p">:</span> <span class="sa">b</span><span class="s1">'this is a byte string'</span><span class="p">})</span><span class="o">.</span><span class="n">inserted_id</span>
<span class="n">ObjectId</span><span class="p">(</span><span class="s1">'4f9086b1fba5222021000000'</span><span class="p">)</span>
<span class="o">>>></span> <span class="n">c</span><span class="o">.</span><span class="n">test</span><span class="o">.</span><span class="n">bintest</span><span class="o">.</span><span class="n">find_one</span><span class="p">()</span>
<span class="p">{</span><span class="s1">'binary'</span><span class="p">:</span> <span class="sa">b</span><span class="s1">'this is a byte string'</span><span class="p">,</span> <span class="s1">'_id'</span><span class="p">:</span> <span class="n">ObjectId</span><span class="p">(</span><span class="s1">'4f9086b1fba5222021000000'</span><span class="p">)}</span>
</pre></div>
</div>
<p>Now retrieve the same document in Python 2. Notice the byte string is decoded
to <a class="reference internal" href="api/bson/binary.html#bson.binary.Binary" title="bson.binary.Binary"><code class="xref py py-class docutils literal notranslate"><span class="pre">Binary</span></code></a>:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">Python</span> <span class="mf">2.7</span><span class="o">.</span><span class="mi">6</span> <span class="p">(</span><span class="n">default</span><span class="p">,</span> <span class="n">Feb</span> <span class="mi">26</span> <span class="mi">2014</span><span class="p">,</span> <span class="mi">10</span><span class="p">:</span><span class="mi">36</span><span class="p">:</span><span class="mi">22</span><span class="p">)</span>
<span class="p">[</span><span class="n">GCC</span> <span class="mf">4.7</span><span class="o">.</span><span class="mi">3</span><span class="p">]</span> <span class="n">on</span> <span class="n">linux2</span>
<span class="n">Type</span> <span class="s2">"help"</span><span class="p">,</span> <span class="s2">"copyright"</span><span class="p">,</span> <span class="s2">"credits"</span> <span class="ow">or</span> <span class="s2">"license"</span> <span class="k">for</span> <span class="n">more</span> <span class="n">information</span><span class="o">.</span>
<span class="o">>>></span> <span class="kn">import</span> <span class="nn">pymongo</span>
<span class="o">>>></span> <span class="n">c</span> <span class="o">=</span> <span class="n">pymongo</span><span class="o">.</span><span class="n">MongoClient</span><span class="p">()</span>
<span class="o">>>></span> <span class="n">c</span><span class="o">.</span><span class="n">test</span><span class="o">.</span><span class="n">bintest</span><span class="o">.</span><span class="n">find_one</span><span class="p">()</span>
<span class="p">{</span><span class="sa">u</span><span class="s1">'binary'</span><span class="p">:</span> <span class="n">Binary</span><span class="p">(</span><span class="s1">'this is a byte string'</span><span class="p">,</span> <span class="mi">0</span><span class="p">),</span> <span class="sa">u</span><span class="s1">'_id'</span><span class="p">:</span> <span class="n">ObjectId</span><span class="p">(</span><span class="s1">'4f9086b1fba5222021000000'</span><span class="p">)}</span>
</pre></div>
</div>
<p>There is a similar change in behavior in parsing JSON binary with subtype 0.
In Python 3 they are decoded into <code class="xref py py-class docutils literal notranslate"><span class="pre">bytes</span></code>. In Python 2 they are
decoded to <a class="reference internal" href="api/bson/binary.html#bson.binary.Binary" title="bson.binary.Binary"><code class="xref py py-class docutils literal notranslate"><span class="pre">Binary</span></code></a> with subtype 0.</p>
<p>For example, let’s decode a JSON binary subtype 0 using Python 3. Notice the
byte string is decoded to <code class="xref py py-class docutils literal notranslate"><span class="pre">bytes</span></code>:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">Python</span> <span class="mf">3.6</span><span class="o">.</span><span class="mi">1</span> <span class="p">(</span><span class="n">v3</span><span class="o">.</span><span class="mf">6.1</span><span class="p">:</span><span class="mi">69</span><span class="n">c0db5050</span><span class="p">,</span> <span class="n">Mar</span> <span class="mi">21</span> <span class="mi">2017</span><span class="p">,</span> <span class="mi">01</span><span class="p">:</span><span class="mi">21</span><span class="p">:</span><span class="mi">04</span><span class="p">)</span>
<span class="p">[</span><span class="n">GCC</span> <span class="mf">4.2</span><span class="o">.</span><span class="mi">1</span> <span class="p">(</span><span class="n">Apple</span> <span class="n">Inc</span><span class="o">.</span> <span class="n">build</span> <span class="mi">5666</span><span class="p">)</span> <span class="p">(</span><span class="n">dot</span> <span class="mi">3</span><span class="p">)]</span> <span class="n">on</span> <span class="n">darwin</span>
<span class="n">Type</span> <span class="s2">"help"</span><span class="p">,</span> <span class="s2">"copyright"</span><span class="p">,</span> <span class="s2">"credits"</span> <span class="ow">or</span> <span class="s2">"license"</span> <span class="k">for</span> <span class="n">more</span> <span class="n">information</span><span class="o">.</span>
<span class="o">>>></span> <span class="kn">from</span> <span class="nn">bson.json_util</span> <span class="k">import</span> <span class="n">loads</span>
<span class="o">>>></span> <span class="n">loads</span><span class="p">(</span><span class="s1">'{"b": {"$binary": "dGhpcyBpcyBhIGJ5dGUgc3RyaW5n", "$type": "00"}}'</span><span class="p">)</span>
<span class="p">{</span><span class="s1">'b'</span><span class="p">:</span> <span class="sa">b</span><span class="s1">'this is a byte string'</span><span class="p">}</span>
</pre></div>
</div>
<p>Now decode the same JSON in Python 2 . Notice the byte string is decoded
to <a class="reference internal" href="api/bson/binary.html#bson.binary.Binary" title="bson.binary.Binary"><code class="xref py py-class docutils literal notranslate"><span class="pre">Binary</span></code></a>:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">Python</span> <span class="mf">2.7</span><span class="o">.</span><span class="mi">10</span> <span class="p">(</span><span class="n">default</span><span class="p">,</span> <span class="n">Feb</span> <span class="mi">7</span> <span class="mi">2017</span><span class="p">,</span> <span class="mi">00</span><span class="p">:</span><span class="mi">08</span><span class="p">:</span><span class="mi">15</span><span class="p">)</span>
<span class="p">[</span><span class="n">GCC</span> <span class="mf">4.2</span><span class="o">.</span><span class="mi">1</span> <span class="n">Compatible</span> <span class="n">Apple</span> <span class="n">LLVM</span> <span class="mf">8.0</span><span class="o">.</span><span class="mi">0</span> <span class="p">(</span><span class="n">clang</span><span class="o">-</span><span class="mf">800.0</span><span class="o">.</span><span class="mi">34</span><span class="p">)]</span> <span class="n">on</span> <span class="n">darwin</span>
<span class="n">Type</span> <span class="s2">"help"</span><span class="p">,</span> <span class="s2">"copyright"</span><span class="p">,</span> <span class="s2">"credits"</span> <span class="ow">or</span> <span class="s2">"license"</span> <span class="k">for</span> <span class="n">more</span> <span class="n">information</span><span class="o">.</span>
<span class="o">>>></span> <span class="kn">from</span> <span class="nn">bson.json_util</span> <span class="k">import</span> <span class="n">loads</span>
<span class="o">>>></span> <span class="n">loads</span><span class="p">(</span><span class="s1">'{"b": {"$binary": "dGhpcyBpcyBhIGJ5dGUgc3RyaW5n", "$type": "00"}}'</span><span class="p">)</span>
<span class="p">{</span><span class="sa">u</span><span class="s1">'b'</span><span class="p">:</span> <span class="n">Binary</span><span class="p">(</span><span class="s1">'this is a byte string'</span><span class="p">,</span> <span class="mi">0</span><span class="p">)}</span>
</pre></div>
</div>
</div>
<div class="section" id="why-can-t-i-share-pickled-objectids-between-some-versions-of-python-2-and-3">
<h2><a class="toc-backref" href="#id4">Why can’t I share pickled ObjectIds between some versions of Python 2 and 3?</a><a class="headerlink" href="#why-can-t-i-share-pickled-objectids-between-some-versions-of-python-2-and-3" title="Permalink to this headline">¶</a></h2>
<p>Instances of <a class="reference internal" href="api/bson/objectid.html#bson.objectid.ObjectId" title="bson.objectid.ObjectId"><code class="xref py py-class docutils literal notranslate"><span class="pre">ObjectId</span></code></a> pickled using Python 2
can always be unpickled using Python 3.</p>
<p>If you pickled an ObjectId using Python 2 and want to unpickle it using
Python 3 you must pass <code class="docutils literal notranslate"><span class="pre">encoding='latin-1'</span></code> to pickle.loads:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">Python</span> <span class="mf">2.7</span><span class="o">.</span><span class="mi">6</span> <span class="p">(</span><span class="n">default</span><span class="p">,</span> <span class="n">Feb</span> <span class="mi">26</span> <span class="mi">2014</span><span class="p">,</span> <span class="mi">10</span><span class="p">:</span><span class="mi">36</span><span class="p">:</span><span class="mi">22</span><span class="p">)</span>
<span class="p">[</span><span class="n">GCC</span> <span class="mf">4.7</span><span class="o">.</span><span class="mi">3</span><span class="p">]</span> <span class="n">on</span> <span class="n">linux2</span>
<span class="n">Type</span> <span class="s2">"help"</span><span class="p">,</span> <span class="s2">"copyright"</span><span class="p">,</span> <span class="s2">"credits"</span> <span class="ow">or</span> <span class="s2">"license"</span> <span class="k">for</span> <span class="n">more</span> <span class="n">information</span><span class="o">.</span>
<span class="o">>>></span> <span class="kn">import</span> <span class="nn">pickle</span>
<span class="o">>>></span> <span class="kn">from</span> <span class="nn">bson.objectid</span> <span class="k">import</span> <span class="n">ObjectId</span>
<span class="o">>>></span> <span class="n">oid</span> <span class="o">=</span> <span class="n">ObjectId</span><span class="p">()</span>
<span class="o">>>></span> <span class="n">oid</span>
<span class="n">ObjectId</span><span class="p">(</span><span class="s1">'4f919ba2fba5225b84000000'</span><span class="p">)</span>
<span class="o">>>></span> <span class="n">pickle</span><span class="o">.</span><span class="n">dumps</span><span class="p">(</span><span class="n">oid</span><span class="p">)</span>
<span class="s1">'ccopy_reg</span><span class="se">\n</span><span class="s1">_reconstructor</span><span class="se">\n</span><span class="s1">p0</span><span class="se">\n</span><span class="s1">(cbson.objectid\...'</span>
<span class="n">Python</span> <span class="mf">3.6</span><span class="o">.</span><span class="mi">1</span> <span class="p">(</span><span class="n">v3</span><span class="o">.</span><span class="mf">6.1</span><span class="p">:</span><span class="mi">69</span><span class="n">c0db5050</span><span class="p">,</span> <span class="n">Mar</span> <span class="mi">21</span> <span class="mi">2017</span><span class="p">,</span> <span class="mi">01</span><span class="p">:</span><span class="mi">21</span><span class="p">:</span><span class="mi">04</span><span class="p">)</span>
<span class="p">[</span><span class="n">GCC</span> <span class="mf">4.9</span><span class="o">.</span><span class="mi">3</span><span class="p">]</span> <span class="n">on</span> <span class="n">linux</span>
<span class="n">Type</span> <span class="s2">"help"</span><span class="p">,</span> <span class="s2">"copyright"</span><span class="p">,</span> <span class="s2">"credits"</span> <span class="ow">or</span> <span class="s2">"license"</span> <span class="k">for</span> <span class="n">more</span> <span class="n">information</span><span class="o">.</span>
<span class="o">>>></span> <span class="kn">import</span> <span class="nn">pickle</span>
<span class="o">>>></span> <span class="n">pickle</span><span class="o">.</span><span class="n">loads</span><span class="p">(</span><span class="sa">b</span><span class="s1">'ccopy_reg</span><span class="se">\n</span><span class="s1">_reconstructor</span><span class="se">\n</span><span class="s1">p0</span><span class="se">\n</span><span class="s1">(cbson.objectid\...'</span><span class="p">,</span> <span class="n">encoding</span><span class="o">=</span><span class="s1">'latin-1'</span><span class="p">)</span>
<span class="n">ObjectId</span><span class="p">(</span><span class="s1">'4f919ba2fba5225b84000000'</span><span class="p">)</span>
</pre></div>
</div>
<p>If you need to pickle ObjectIds using Python 3 and unpickle them using Python 2
you must use <code class="docutils literal notranslate"><span class="pre">protocol</span> <span class="pre"><=</span> <span class="pre">2</span></code>:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">Python</span> <span class="mf">3.6</span><span class="o">.</span><span class="mi">1</span> <span class="p">(</span><span class="n">v3</span><span class="o">.</span><span class="mf">6.1</span><span class="p">:</span><span class="mi">69</span><span class="n">c0db5050</span><span class="p">,</span> <span class="n">Mar</span> <span class="mi">21</span> <span class="mi">2017</span><span class="p">,</span> <span class="mi">01</span><span class="p">:</span><span class="mi">21</span><span class="p">:</span><span class="mi">04</span><span class="p">)</span>
<span class="p">[</span><span class="n">GCC</span> <span class="mf">4.9</span><span class="o">.</span><span class="mi">3</span><span class="p">]</span> <span class="n">on</span> <span class="n">linux</span>
<span class="n">Type</span> <span class="s2">"help"</span><span class="p">,</span> <span class="s2">"copyright"</span><span class="p">,</span> <span class="s2">"credits"</span> <span class="ow">or</span> <span class="s2">"license"</span> <span class="k">for</span> <span class="n">more</span> <span class="n">information</span><span class="o">.</span>
<span class="o">>>></span> <span class="kn">import</span> <span class="nn">pickle</span>
<span class="o">>>></span> <span class="kn">from</span> <span class="nn">bson.objectid</span> <span class="k">import</span> <span class="n">ObjectId</span>
<span class="o">>>></span> <span class="n">oid</span> <span class="o">=</span> <span class="n">ObjectId</span><span class="p">()</span>
<span class="o">>>></span> <span class="n">oid</span>
<span class="n">ObjectId</span><span class="p">(</span><span class="s1">'4f96f20c430ee6bd06000000'</span><span class="p">)</span>
<span class="o">>>></span> <span class="n">pickle</span><span class="o">.</span><span class="n">dumps</span><span class="p">(</span><span class="n">oid</span><span class="p">,</span> <span class="n">protocol</span><span class="o">=</span><span class="mi">2</span><span class="p">)</span>
<span class="sa">b</span><span class="s1">'</span><span class="se">\x80\x02</span><span class="s1">cbson.objectid</span><span class="se">\n</span><span class="s1">ObjectId</span><span class="se">\n</span><span class="s1">q</span><span class="se">\x00</span><span class="s1">)</span><span class="se">\x81</span><span class="s1">q</span><span class="se">\x01</span><span class="s1">c_codecs</span><span class="se">\n</span><span class="s1">encode\...'</span>
<span class="n">Python</span> <span class="mf">2.6</span><span class="o">.</span><span class="mi">9</span> <span class="p">(</span><span class="n">unknown</span><span class="p">,</span> <span class="n">Feb</span> <span class="mi">26</span> <span class="mi">2014</span><span class="p">,</span> <span class="mi">12</span><span class="p">:</span><span class="mi">39</span><span class="p">:</span><span class="mi">10</span><span class="p">)</span>
<span class="p">[</span><span class="n">GCC</span> <span class="mf">4.7</span><span class="o">.</span><span class="mi">3</span><span class="p">]</span> <span class="n">on</span> <span class="n">linux2</span>
<span class="n">Type</span> <span class="s2">"help"</span><span class="p">,</span> <span class="s2">"copyright"</span><span class="p">,</span> <span class="s2">"credits"</span> <span class="ow">or</span> <span class="s2">"license"</span> <span class="k">for</span> <span class="n">more</span> <span class="n">information</span><span class="o">.</span>
<span class="o">>>></span> <span class="kn">import</span> <span class="nn">pickle</span>
<span class="o">>>></span> <span class="n">pickle</span><span class="o">.</span><span class="n">loads</span><span class="p">(</span><span class="s1">'</span><span class="se">\x80\x02</span><span class="s1">cbson.objectid</span><span class="se">\n</span><span class="s1">ObjectId</span><span class="se">\n</span><span class="s1">q</span><span class="se">\x00</span><span class="s1">)</span><span class="se">\x81</span><span class="s1">q</span><span class="se">\x01</span><span class="s1">c_codecs</span><span class="se">\n</span><span class="s1">encode\...'</span><span class="p">)</span>
<span class="n">ObjectId</span><span class="p">(</span><span class="s1">'4f96f20c430ee6bd06000000'</span><span class="p">)</span>
</pre></div>
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