pyperclip [:platform_system == "Darwin"] pyobjc-core pyobjc [:platform_system == "Linux" and python_version < "3.0"] Xlib [:platform_system == "Linux" and python_version >= "3.0"] python3-Xlib [:python_version == "2.7"] Pillow>=2.0.0 [:python_version == "3.2"] Pillow<=3.4.2,>=2.0.0 [:python_version == "3.3"] Pillow<=4.3.0,>=2.0.0 [:python_version == "3.4"] Pillow<=5.4.1,>=2.5.0 [:python_version == "3.5"] Pillow>=3.2.0 [:python_version == "3.6"] Pillow>=4.0.0 [:python_version == "3.7"] Pillow>=5.2.0