07-09-2022, 09:02 AM
How to Install psycopg2 in Python?
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<div class="kksr-legend"> 5/5 – (1 vote) </div>
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<pre class="EnlighterJSRAW" data-enlighter-language="raw" data-enlighter-theme="" data-enlighter-highlight="" data-enlighter-linenumbers="" data-enlighter-lineoffset="" data-enlighter-title="" data-enlighter-group="">pip install psycopg2</pre>
<p>The Python <strong>psycopg2 </strong>library is among the top 100 Python libraries, with more than <strong>15,749,750</strong> downloads. This article will show you everything you need to get this installed in your Python environment.</p>
<ul>
<li><a href="https://pypi.org/project/psycopg2" target="_blank" rel="noreferrer noopener" title="https://pypi.org/project/psycopg2">Library Link</a></li>
</ul>
<h2>How to Install psycopg2 on Windows?</h2>
<ol>
<li>Type <code>"cmd"</code> in the search bar and hit <code>Enter</code> to open the command line.</li>
<li>Type “<code>pip install psycopg2</code>” (without quotes) in the command line and hit <code>Enter</code> again. This installs psycopg2 for your default Python installation.</li>
<li>The previous command may not work if you have both Python versions 2 and 3 on your computer. In this case, try <code>"pip3 install psycopg2"</code> or “<code>python -m pip install psycopg2</code>“.</li>
<li>Wait for the installation to terminate successfully. It is now installed on your Windows machine.</li>
</ol>
<p>Here’s how to open the command line on a (German) Windows machine:</p>
<figure class="wp-block-image size-full"><img loading="lazy" width="986" height="852" src="https://blog.finxter.com/wp-content/uploads/2021/09/image-96.png" alt="Open CMD in Windows" class="wp-image-35703" srcset="https://blog.finxter.com/wp-content/uploads/2021/09/image-96.png 986w, https://blog.finxter.com/wp-content/uplo...00x259.png 300w, https://blog.finxter.com/wp-content/uplo...68x664.png 768w" sizes="(max-width: 986px) 100vw, 986px" /></figure>
<p>First, try the following command to install <strong>psycopg2</strong> on your system:</p>
<pre class="EnlighterJSRAW" data-enlighter-language="powershell" data-enlighter-theme="" data-enlighter-highlight="" data-enlighter-linenumbers="" data-enlighter-lineoffset="" data-enlighter-title="" data-enlighter-group="">pip install psycopg2</pre>
<p>Second, if this leads to an error message, try this command to install <strong>psycopg2</strong> on your system:</p>
<pre class="EnlighterJSRAW" data-enlighter-language="powershell" data-enlighter-theme="" data-enlighter-highlight="" data-enlighter-linenumbers="" data-enlighter-lineoffset="" data-enlighter-title="" data-enlighter-group="">pip3 install psycopg2</pre>
<p>Third, if both do not work, use the following long-form command:</p>
<pre class="EnlighterJSRAW" data-enlighter-language="generic" data-enlighter-theme="" data-enlighter-highlight="" data-enlighter-linenumbers="" data-enlighter-lineoffset="" data-enlighter-title="" data-enlighter-group="">python -m pip install psycopg2</pre>
<p>The difference between <code>pip</code> and <code>pip3</code> is that <code>pip3</code> is an updated version of <code>pip</code> for Python <a href="https://blog.finxter.com/how-to-check-your-python-version/" target="_blank" rel="noreferrer noopener" title="HOW TO CHECK YOUR PYTHON VERSION">version </a>3. Depending on what’s first in the <code>PATH</code> variable, <code>pip</code> will refer to your Python 2 or Python 3 installation—and you cannot know which without checking the environment variables. To resolve this uncertainty, you can use <code>pip3</code>, which will always refer to your default Python 3 installation.</p>
<h2>How to Install psycopg2 on Linux?</h2>
<p>You can install psycopg2 on Linux in four steps:</p>
<ol>
<li>Open your Linux terminal or shell</li>
<li>Type “<code>pip install psycopg2</code>” (without quotes), hit Enter.</li>
<li>If it doesn’t work, try <code>"pip3 install psycopg2"</code> or “<code>python -m pip install psycopg2</code>“.</li>
<li>Wait for the installation to terminate successfully. </li>
</ol>
<p>The package is now installed on your Linux operating system.</p>
<h2>How to Install psycopg2 on macOS?</h2>
<p>Similarly, you can install psycopg2 on macOS in four steps:</p>
<ol>
<li>Open your macOS terminal.</li>
<li>Type “<code>pip install psycopg2</code>” without quotes and hit <code>Enter</code>.</li>
<li>If it doesn’t work, try <code>"pip3 install psycopg2"</code> or “<code>python -m pip install psycopg2</code>“.</li>
<li>Wait for the installation to terminate successfully. </li>
</ol>
<p>The package is now installed on your macOS.</p>
<h2>How to Install psycopg2 in PyCharm?</h2>
<p>Given a <a href="https://blog.finxter.com/pycharm-a-simple-illustrated-guide/" target="_blank" rel="noreferrer noopener">PyCharm </a>project. How to install the psycopg2 library in your project within a <a href="https://blog.finxter.com/python-virtual-environments-with-venv-a-step-by-step-guide/" target="_blank" rel="noreferrer noopener">virtual environment</a> or globally? Here’s a <a href="https://blog.finxter.com/how-to-install-a-library-on-pycharm/" target="_blank" rel="noreferrer noopener">solution </a>that always works:</p>
<ul>
<li>Open <code><strong>File > Settings > Project</strong></code> from the PyCharm menu.</li>
<li>Select your current project.</li>
<li>Click the <code><strong>Python Interpreter</strong></code> tab within your project tab.</li>
<li>Click the small <code><strong>+</strong></code> symbol to add a new library to the project.</li>
<li>Now type in the library to be installed, in your example <code>"psycopg2"</code> without quotes, and click <code><strong>Install Package</strong></code>.</li>
<li>Wait for the installation to terminate and close all pop-ups.</li>
</ul>
<p>Here’s the general package installation process as a short animated video—it works analogously for psycopg2 if you type in <em>“psycopg2”</em> in the search field instead:</p>
<figure class="wp-block-image"><img src="https://media.giphy.com/media/VQoZIvOyP23tVvQlW0/source.gif" alt=""/></figure>
<p>Make sure to select only <em>“psycopg2” </em>because there may be other packages that are not required but also contain the same term (<em>false positives</em>):</p>
<h2>How to Install psycopg2 in a Jupyter Notebook?</h2>
<p>To install any package in a Jupyter notebook, you can prefix the <code>!pip install my_package</code> statement with the exclamation mark <code>"!"</code>. This works for the psycopg2 library too:</p>
<pre class="EnlighterJSRAW" data-enlighter-language="python" data-enlighter-theme="" data-enlighter-highlight="" data-enlighter-linenumbers="" data-enlighter-lineoffset="" data-enlighter-title="" data-enlighter-group="">!pip install my_package</pre>
<p>This automatically installs the psycopg2 library when the cell is first executed.</p>
<h2>How to Resolve ModuleNotFoundError: No module named ‘psycopg2’?</h2>
<p>Say you try to import the psycopg2 package into your Python script without installing it first:</p>
<pre class="EnlighterJSRAW" data-enlighter-language="python" data-enlighter-theme="" data-enlighter-highlight="" data-enlighter-linenumbers="" data-enlighter-lineoffset="" data-enlighter-title="" data-enlighter-group="">import psycopg2
# ... ModuleNotFoundError: No module named 'psycopg2'</pre>
<p>Because you haven’t installed the package, Python raises a <code>ModuleNotFoundError: No module named 'psycopg2'</code>. </p>
<p>To fix the error, install the psycopg2 library using “<code>pip install psycopg2</code>” or “<code>pip3 install psycopg2</code>” in your operating system’s shell or terminal first. </p>
<p>See above for the different ways to install psycopg2 in your environment.</p>
<h2>Improve Your Python Skills</h2>
<p>If you want to keep improving your Python skills and learn about new and exciting technologies such as Blockchain development, machine learning, and data science, check out the Finxter <a href="https://blog.finxter.com/email-academy/" title="Email Academy" target="_blank" rel="noreferrer noopener">free email academy</a> with cheat sheets, regular tutorials, and programming puzzles.</p>
<p>Join us, it’s fun! <img src="https://s.w.org/images/core/emoji/14.0.0/72x72/1f642.png" alt="?" class="wp-smiley" style="height: 1em; max-height: 1em;" /></p>
</div>
https://www.sickgaming.net/blog/2022/07/...in-python/
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<div class="kksr-legend"> 5/5 – (1 vote) </div>
</div>
<pre class="EnlighterJSRAW" data-enlighter-language="raw" data-enlighter-theme="" data-enlighter-highlight="" data-enlighter-linenumbers="" data-enlighter-lineoffset="" data-enlighter-title="" data-enlighter-group="">pip install psycopg2</pre>
<p>The Python <strong>psycopg2 </strong>library is among the top 100 Python libraries, with more than <strong>15,749,750</strong> downloads. This article will show you everything you need to get this installed in your Python environment.</p>
<ul>
<li><a href="https://pypi.org/project/psycopg2" target="_blank" rel="noreferrer noopener" title="https://pypi.org/project/psycopg2">Library Link</a></li>
</ul>
<h2>How to Install psycopg2 on Windows?</h2>
<ol>
<li>Type <code>"cmd"</code> in the search bar and hit <code>Enter</code> to open the command line.</li>
<li>Type “<code>pip install psycopg2</code>” (without quotes) in the command line and hit <code>Enter</code> again. This installs psycopg2 for your default Python installation.</li>
<li>The previous command may not work if you have both Python versions 2 and 3 on your computer. In this case, try <code>"pip3 install psycopg2"</code> or “<code>python -m pip install psycopg2</code>“.</li>
<li>Wait for the installation to terminate successfully. It is now installed on your Windows machine.</li>
</ol>
<p>Here’s how to open the command line on a (German) Windows machine:</p>
<figure class="wp-block-image size-full"><img loading="lazy" width="986" height="852" src="https://blog.finxter.com/wp-content/uploads/2021/09/image-96.png" alt="Open CMD in Windows" class="wp-image-35703" srcset="https://blog.finxter.com/wp-content/uploads/2021/09/image-96.png 986w, https://blog.finxter.com/wp-content/uplo...00x259.png 300w, https://blog.finxter.com/wp-content/uplo...68x664.png 768w" sizes="(max-width: 986px) 100vw, 986px" /></figure>
<p>First, try the following command to install <strong>psycopg2</strong> on your system:</p>
<pre class="EnlighterJSRAW" data-enlighter-language="powershell" data-enlighter-theme="" data-enlighter-highlight="" data-enlighter-linenumbers="" data-enlighter-lineoffset="" data-enlighter-title="" data-enlighter-group="">pip install psycopg2</pre>
<p>Second, if this leads to an error message, try this command to install <strong>psycopg2</strong> on your system:</p>
<pre class="EnlighterJSRAW" data-enlighter-language="powershell" data-enlighter-theme="" data-enlighter-highlight="" data-enlighter-linenumbers="" data-enlighter-lineoffset="" data-enlighter-title="" data-enlighter-group="">pip3 install psycopg2</pre>
<p>Third, if both do not work, use the following long-form command:</p>
<pre class="EnlighterJSRAW" data-enlighter-language="generic" data-enlighter-theme="" data-enlighter-highlight="" data-enlighter-linenumbers="" data-enlighter-lineoffset="" data-enlighter-title="" data-enlighter-group="">python -m pip install psycopg2</pre>
<p>The difference between <code>pip</code> and <code>pip3</code> is that <code>pip3</code> is an updated version of <code>pip</code> for Python <a href="https://blog.finxter.com/how-to-check-your-python-version/" target="_blank" rel="noreferrer noopener" title="HOW TO CHECK YOUR PYTHON VERSION">version </a>3. Depending on what’s first in the <code>PATH</code> variable, <code>pip</code> will refer to your Python 2 or Python 3 installation—and you cannot know which without checking the environment variables. To resolve this uncertainty, you can use <code>pip3</code>, which will always refer to your default Python 3 installation.</p>
<h2>How to Install psycopg2 on Linux?</h2>
<p>You can install psycopg2 on Linux in four steps:</p>
<ol>
<li>Open your Linux terminal or shell</li>
<li>Type “<code>pip install psycopg2</code>” (without quotes), hit Enter.</li>
<li>If it doesn’t work, try <code>"pip3 install psycopg2"</code> or “<code>python -m pip install psycopg2</code>“.</li>
<li>Wait for the installation to terminate successfully. </li>
</ol>
<p>The package is now installed on your Linux operating system.</p>
<h2>How to Install psycopg2 on macOS?</h2>
<p>Similarly, you can install psycopg2 on macOS in four steps:</p>
<ol>
<li>Open your macOS terminal.</li>
<li>Type “<code>pip install psycopg2</code>” without quotes and hit <code>Enter</code>.</li>
<li>If it doesn’t work, try <code>"pip3 install psycopg2"</code> or “<code>python -m pip install psycopg2</code>“.</li>
<li>Wait for the installation to terminate successfully. </li>
</ol>
<p>The package is now installed on your macOS.</p>
<h2>How to Install psycopg2 in PyCharm?</h2>
<p>Given a <a href="https://blog.finxter.com/pycharm-a-simple-illustrated-guide/" target="_blank" rel="noreferrer noopener">PyCharm </a>project. How to install the psycopg2 library in your project within a <a href="https://blog.finxter.com/python-virtual-environments-with-venv-a-step-by-step-guide/" target="_blank" rel="noreferrer noopener">virtual environment</a> or globally? Here’s a <a href="https://blog.finxter.com/how-to-install-a-library-on-pycharm/" target="_blank" rel="noreferrer noopener">solution </a>that always works:</p>
<ul>
<li>Open <code><strong>File > Settings > Project</strong></code> from the PyCharm menu.</li>
<li>Select your current project.</li>
<li>Click the <code><strong>Python Interpreter</strong></code> tab within your project tab.</li>
<li>Click the small <code><strong>+</strong></code> symbol to add a new library to the project.</li>
<li>Now type in the library to be installed, in your example <code>"psycopg2"</code> without quotes, and click <code><strong>Install Package</strong></code>.</li>
<li>Wait for the installation to terminate and close all pop-ups.</li>
</ul>
<p>Here’s the general package installation process as a short animated video—it works analogously for psycopg2 if you type in <em>“psycopg2”</em> in the search field instead:</p>
<figure class="wp-block-image"><img src="https://media.giphy.com/media/VQoZIvOyP23tVvQlW0/source.gif" alt=""/></figure>
<p>Make sure to select only <em>“psycopg2” </em>because there may be other packages that are not required but also contain the same term (<em>false positives</em>):</p>
<h2>How to Install psycopg2 in a Jupyter Notebook?</h2>
<p>To install any package in a Jupyter notebook, you can prefix the <code>!pip install my_package</code> statement with the exclamation mark <code>"!"</code>. This works for the psycopg2 library too:</p>
<pre class="EnlighterJSRAW" data-enlighter-language="python" data-enlighter-theme="" data-enlighter-highlight="" data-enlighter-linenumbers="" data-enlighter-lineoffset="" data-enlighter-title="" data-enlighter-group="">!pip install my_package</pre>
<p>This automatically installs the psycopg2 library when the cell is first executed.</p>
<h2>How to Resolve ModuleNotFoundError: No module named ‘psycopg2’?</h2>
<p>Say you try to import the psycopg2 package into your Python script without installing it first:</p>
<pre class="EnlighterJSRAW" data-enlighter-language="python" data-enlighter-theme="" data-enlighter-highlight="" data-enlighter-linenumbers="" data-enlighter-lineoffset="" data-enlighter-title="" data-enlighter-group="">import psycopg2
# ... ModuleNotFoundError: No module named 'psycopg2'</pre>
<p>Because you haven’t installed the package, Python raises a <code>ModuleNotFoundError: No module named 'psycopg2'</code>. </p>
<p>To fix the error, install the psycopg2 library using “<code>pip install psycopg2</code>” or “<code>pip3 install psycopg2</code>” in your operating system’s shell or terminal first. </p>
<p>See above for the different ways to install psycopg2 in your environment.</p>
<h2>Improve Your Python Skills</h2>
<p>If you want to keep improving your Python skills and learn about new and exciting technologies such as Blockchain development, machine learning, and data science, check out the Finxter <a href="https://blog.finxter.com/email-academy/" title="Email Academy" target="_blank" rel="noreferrer noopener">free email academy</a> with cheat sheets, regular tutorials, and programming puzzles.</p>
<p>Join us, it’s fun! <img src="https://s.w.org/images/core/emoji/14.0.0/72x72/1f642.png" alt="?" class="wp-smiley" style="height: 1em; max-height: 1em;" /></p>
</div>
https://www.sickgaming.net/blog/2022/07/...in-python/