```bash
pip install -r requirements.txt
```
Here's a step-by-step breakdown:
1. **Create a `requirements.txt` file:**
- Open a text editor and create a file named `requirements.txt`.
- Add the names of the Python packages you want to install, each on a separate line. Optionally, you can specify versions, e.g. `package-name==1.2.3` to install a specific version.
Example `requirements.txt` file:
```
requests
Flask==2.0.1
pandas>=1.0.0
```
2. **Navigate to the directory containing the `requirements.txt` file:**
- Open your terminal or command prompt.
- Use the `cd` command to navigate to the directory where the `requirements.txt` file is located.
Example (assuming the file is on your desktop):
```bash
cd Desktop
```
3. **Run the `pip install` command:**
- Once you're in the correct directory, run the following command:
```bash
pip install -r requirements.txt
```
This command tells `pip` to install the packages specified in the `requirements.txt` file.
- If you are using a virtual environment (which is recommended for project isolation), make sure the virtual environment is activated before running the `pip install` command.
Example (activating a virtual environment):
```bash
source venv/bin/activate # On Linux or macOS
# or
venv\Scripts\activate # On Windows
```
After running the `pip install` command, the specified packages and their dependencies will be installed in your Python environment.
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