Creating and managing virtual environments and installing dependencies with pip, each explained with a short example.
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- What is a Python virtual environment?
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An isolated Python installation on your system that has its own set of installed packages and Python version, separate from the system Python.- Why should you use a virtual environment?
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To avoid package version conflicts between projects. Each project can have different versions of the same package without interfering with each other.- What is pip?
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Python's package installer. It downloads and installs Python packages from the Python Package Index (PyPI).- How do you create a virtual environment named 'myenv' using venv?
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python -m venv myenv- How do you activate a virtual environment on macOS or Linux?
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source myenv/bin/activate- How do you activate a virtual environment on Windows?
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myenv\Scripts\activate- How do you deactivate a virtual environment?
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deactivate- What is the difference between venv and virtualenv?
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venv is Python's built-in module (Python 3.3+), while virtualenv is a third-party package that works on older Python versions and has more features.- How do you install a package called 'requests' using pip?
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pip install requests- How do you list all packages installed in your virtual environment?
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pip list- How do you create a requirements.txt file from your current environment?
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pip freeze > requirements.txt- How do you install all packages listed in a requirements.txt file?
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pip install -r requirements.txt- How do you upgrade an installed package to the latest version?
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pip install --upgrade package_name- How do you uninstall a package?
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pip uninstall package_name- How do you check the version of an installed package?
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pip show package_name
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