<s>[INST] This command installs Python packages

pip install -r requirements.txt

How to make sure that it will install the correct versions of the packages? [/INST] The best way to make sure that pip installs the correct versions of the packages is to check the contents of requirements.txt. The command "pip install -r requirements.txt" will install the packages and versions listed in the file, so everything is dependent on that file being correct.</s>\ <s>[INST] Thanks, but how do I make requirements.txt install certain versions for me? How can I make sure that it installs an exact version or a version that is at least > 2.0.3 for instance? [/INST] To specify a specific version of a package in a Python requirements.txt file, you can add the package name followed by the version number in square brackets. For example:

```
numpy==1.18.1
pandas==0.25.3
```

This will ensure that the specified version of the package is installed when you run `pip install -r requirements.txt`.</s>