for windows

• open PS(powershell)
• pip freeze | ForEach-Object { pip uninstall -y $_.split('==')[0] }
• similarly to the Unix version. It lists all installed packages (pip freeze), then for each package, it extracts the package name and uninstalls it (pip uninstall -y).

for linux/mac

• pip freeze | xargs pip uninstall -y
• list all installed packages (pip freeze), then pass each package to the pip uninstall command to uninstall it (xargs pip uninstall -y).