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troubleshooting old urllib conflicts: a deep dive into github issue 2963 (and beyond)

github issue 2963 often manifests as a failure to install a python project alongside other dependencies, specifically when an older version of the `urllib` library is involved. this isn't a problem limited to a single project; it highlights a broader issue concerning python's package management and dependency resolution. let's dissect this common problem, its underlying causes, and effective solutions.

*understanding the problem:*

the core issue revolves around conflicting versions of python's `urllib` library (or its components like `urllib2`, which was deprecated in python 3). older projects might rely on `urllib2` which isn't directly present in newer python versions. newer projects, however, might implicitly depend on the newer `urllib` package, leading to clashes during installation. this often becomes apparent when using tools like `pip`, which attempts to satisfy all dependencies simultaneously. a simple `pip install project` might fail with error messages related to `urllib`, `urllib2`, or unresolved dependencies.

*possible scenarios and root causes:*

1. *explicit dependency conflicts:* your project's `requirements.txt` or `setup.py` file explicitly lists a specific, potentially outdated, version of `urllib` or a library depending on `urllib2`. this directly contradicts the requirements of another installed package, causing installation to break.

2. *implicit dependency conflicts:* a dependency of your project, perhaps a deeply nested one, requires an old version of `urllib` or `urllib2`. `pip` might attempt to install this older version, conflicting with a newer `urllib` already installed in your environment, resulting in failure.

3. *virtual environment issues:* failing to use virtual environments is a frequent culprit. each project should ideally have its own isolated virtual environment, preventing clashes between dependencies of different pro ...

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