[Tut] How to Install psycopg2 in Python?

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How to Install psycopg2 in Python?

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Code:

pip install psycopg2

The Python psycopg2 library is among the top 100 Python libraries, with more than 15,749,750 downloads. This article will show you everything you need to get this installed in your Python environment.

• Library Link
  

How to Install psycopg2 on Windows?

1. Type
   Code:

   "cmd"
   in the search bar and hit
   Code:

   Enter
   to open the command line.
   
   
2. Type “
   Code:

   pip install psycopg2
   ” (without quotes) in the command line and hit
   Code:

   Enter
   again. This installs psycopg2 for your default Python installation.
   
   
3. 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"
   or “
   Code:

   python -m pip install psycopg2
   “.
   
   
4. Wait for the installation to terminate successfully. It is now installed on your Windows machine.
   

Here’s how to open the command line on a (German) Windows machine:



First, try the following command to install psycopg2 on your system:

Code:

pip install psycopg2

Second, if this leads to an error message, try this command to install psycopg2 on your system:

Code:

pip3 install psycopg2

Third, if both do not work, use the following long-form command:

Code:

python -m pip install psycopg2

The difference between

Code:

pip

and

Code:

pip3

is that

Code:

pip3

is an updated version of

Code:

pip

for Python version3. Depending on what’s first in the

Code:

PATH

variable,

Code:

pip

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

, which will always refer to your default Python 3 installation.

How to Install psycopg2 on Linux?

You can install psycopg2 on Linux in four steps:

1. Open your Linux terminal or shell
   
   
2. Type “
   Code:

   pip install psycopg2
   ” (without quotes), hit Enter.
   
   
3. If it doesn’t work, try
   Code:

   "pip3 install psycopg2"
   or “
   Code:

   python -m pip install psycopg2
   “.
   
   
4. Wait for the installation to terminate successfully.
   

The package is now installed on your Linux operating system.

How to Install psycopg2 on macOS?

Similarly, you can install psycopg2 on macOS in four steps:

1. Open your macOS terminal.
   
   
2. Type “
   Code:

   pip install psycopg2
   ” without quotes and hit
   Code:

   Enter
   .
   
   
3. If it doesn’t work, try
   Code:

   "pip3 install psycopg2"
   or “
   Code:

   python -m pip install psycopg2
   “.
   
   
4. Wait for the installation to terminate successfully.
   

The package is now installed on your macOS.

How to Install psycopg2 in PyCharm?

Given a PyCharmproject. How to install the psycopg2 library in your project within a virtual environment or globally? Here’s a solutionthat always works:

• Open
  Code:

  File > Settings > Project
  from the PyCharm menu.
  
  
• Select your current project.
  
  
• Click the
  Code:

  Python Interpreter
  tab within your project tab.
  
  
• Click the small
  Code:

  +
  symbol to add a new library to the project.
  
  
• Now type in the library to be installed, in your example
  Code:

  "psycopg2"
  without quotes, and click
  Code:

  Install Package
  .
  
  
• Wait for the installation to terminate and close all pop-ups.
  

Here’s the general package installation process as a short animated video—it works analogously for psycopg2 if you type in “psycopg2” in the search field instead:



Make sure to select only “psycopg2” because there may be other packages that are not required but also contain the same term (false positives):

How to Install psycopg2 in a Jupyter Notebook?

To install any package in a Jupyter notebook, you can prefix the

Code:

!pip install my_package

statement with the exclamation mark

Code:

"!"

. This works for the psycopg2 library too:

Code:

!pip install my_package

This automatically installs the psycopg2 library when the cell is first executed.

How to Resolve ModuleNotFoundError: No module named ‘psycopg2’?

Say you try to import the psycopg2 package into your Python script without installing it first:

Code:

import psycopg2 # ... ModuleNotFoundError: No module named 'psycopg2'

Because you haven’t installed the package, Python raises a

Code:

ModuleNotFoundError: No module named 'psycopg2'

.

To fix the error, install the psycopg2 library using “

Code:

pip install psycopg2

” or “

Code:

pip3 install psycopg2

” in your operating system’s shell or terminal first.

See above for the different ways to install psycopg2 in your environment.

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