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\f0\fs24 \cf0 This package will install Python $FULL_VERSION for macOS $MACOSX_DEPLOYMENT_TARGET for the following architecture(s): $ARCHITECTURES.\
\
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\f1\b \cf0 NOTE:
\f0\b0 This is an alpha test preview of Python 3.9.0, the next feature release of Python 3. It is not intended for production use.\
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\cf0 \
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\f1\b \cf0 \ul \ulc0 Certificate verification and OpenSSL\
\f0\b0 \ulnone \
This package includes its own private copy of OpenSSL 1.1.1. The trust certificates in system and user keychains managed by the
\f2\i Keychain Access
\f0\i0 application and the
\f2\i security
\f0\i0 command line utility are not used as defaults by the Python
\f3 ssl
\f0 module. A sample command script is included in
\f3 /Applications/Python 3.9
\f0 to install a curated bundle of default root certificates from the third-party
\f3 certifi
\f0 package ({\field{\*\fldinst{HYPERLINK "https://pypi.org/project/certifi/"}}{\fldrslt https://pypi.org/project/certifi/}}). Double-click on
\f3 Install Certificates
\f0 to run it.\
\
The bundled
\f3 pip
\f0 has its own default certificate store for verifying download connections.\
\
\f1\b \ul Using IDLE or other Tk applications
\f0\b0 \ulnone \
\
This package includes its own private version of Tcl/Tk 8.6. It does not use any system-supplied or third-party supplied versions of Tcl/Tk.\
\
Due to new security checks on macOS 10.15 Catalina, when launching IDLE macOS may open a window with a message
\f1\b "Python" would like to access files in your Documents folder
\f0\b0 . This is normal as IDLE uses your
\f1\b Documents
\f0\b0 folder as its default when opening and saving files; you can still choose other locations in the
\f1\b Open
\f0\b0 and
\f1\b Save
\f0\b0 file dialog windows. Click on the
\f1\b OK
\f0\b0 button to proceed.\
\
\f1\b \ul macOS 10.15 (Catalina) Gatekeeper Requirements [changed in 3.9.0a4]\
\f0\b0 \ulnone \
As of 2020-02-03, Apple has changed how third-party installer packages, like those provided by python.org, are notarized for verification by Gatekeeper and begun enforcing additional requirements such as code signing and use of the hardened runtime. As of 3.9.0a4, python.org installer packages now meet those additional notarization requirements. The necessary changes in packaging should be transparent to your use of Python but, in the unlikely event that you encounter changes in behavior between 3.9.0a4 and earlier 3.9.0 alphas in areas like ctypes, importlib, or mmap, please check bugs.python.org for existing reports and, if necessary, open a new issue.\
\
\f1\b \ul Other changes\
\f0\b0 \ulnone \
For other changes in this release, see the
\f2\i What's new
\f0\i0 section in the {\field{\*\fldinst{HYPERLINK "https://www.python.org/doc/"}}{\fldrslt Documentation Set}} for this release and its
\f2\i Release Notes
\f0\i0 link at {\field{\*\fldinst{HYPERLINK "https://www.python.org/downloads/"}}{\fldrslt https://www.python.org/downloads/}}.\
}
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