Human: This command installs Python packages

pip install -r requirements.txt

How to make sure that it will install the correct versions of the packages?
Assistant: 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.
Human: 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?
Assistant: To install the exact version of a package, in your requirements.txt, specify the version

requirements.txt
```
package_name==2.0.3
```

To install a version > 2.03
```
package_name==2.0.3
```

The comparison operator determines the kind of version clause:
~=: Compatible release clause
==: Version matching clause
!=: Version exclusion clause
<=, >=: Inclusive ordered comparison clause
<, >: Exclusive ordered comparison clause
===: Arbitrary equality clause.
The comma (",") is equivalent to a logical and operator: a candidate version must match all given version clauses in order to match the specifier as a whole.
