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9\f0\fs24 \cf0 This package will install Python $FULL_VERSION for macOS $MACOSX_DEPLOYMENT_TARGET for the following architecture(s): $ARCHITECTURES.\
10\
11\pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\pardirnatural\partightenfactor0
12
13\f1\b \cf0 \ul \ulc0 Certificate verification and OpenSSL\
14
15\f0\b0 \ulnone \
16This package includes its own private copy of OpenSSL 1.1.1.   The trust certificates in system and user keychains managed by the
17\f2\i Keychain Access
18\f0\i0 application and the
19\f2\i security
20\f0\i0  command line utility are not used as defaults by the Python
21\f3 ssl
22\f0  module.  A sample command script is included in
23\f3 /Applications/Python 3.9
24\f0  to install a curated bundle of default root certificates from the third-party
25\f3 certifi
26\f0  package ({\field{\*\fldinst{HYPERLINK "https://pypi.org/project/certifi/"}}{\fldrslt https://pypi.org/project/certifi/}}).  Double-click on
27\f3 Install Certificates
28\f0  to run it.\
29\
30The bundled
31\f3 pip
32\f0  has its own default certificate store for verifying download connections.\
33\
34
35\f1\b \ul Using IDLE or other Tk applications
36\f0\b0 \ulnone \
37\
38This 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.\
39\
40Due to new security checks on macOS 10.15 Catalina, when launching IDLE macOS may open a window with a message
41\f1\b "Python" would like to access files in your Documents folder
42\f0\b0 .  This is normal as IDLE uses your
43\f1\b Documents
44\f0\b0  folder as its default when opening and saving files; you can still choose other locations in the
45\f1\b Open
46\f0\b0  and
47\f1\b Save
48\f0\b0  file dialog windows.  Click on the
49\f1\b OK
50\f0\b0  button to proceed.\
51\
52
53\f1\b \ul macOS 11.0 (Big Sur) and Apple Silicon Mac support [new in 3.9.1]\
54
55\f0\b0 \ulnone \
56As of 2020-11, macOS 11.0 (Big Sur) is the latest release of macOS and one of its major features is the support of new Apple Silicon Macs that are based on the ARM64 CPU architecture specification rather than the Intel 64 (x86_64) architecture used previously. There are other changes in Big Sur that affect Python operation regardless of CPU architecture. As of 3.9.1, Python binaries from python.org fully support Big Sur. \
57\
58python.org binaries for macOS have been provided via a downloadable installer that supports the Intel 64 architecture on macOS 10.9 and newer.  This installer variant remains the default download for 3.9.1;  it will install and run on all Macs that run macOS 10.9 or later, including 11.0 (Big Sur). This variant should run transparently on new Apple Silicon Macs using Apple's Rosetta 2 emulation. \
59\
60Beginning with 3.9.1, we also provide a new "universal2" installer variant that provides universal binaries for both ARM64 and Intel 64 architectures and is also supported on all Macs that support macOS 10.9 or later.  Some of the advantages of the new installer variant: native ARM64 code on Apple Silicon Macs should run significantly faster than Rosetta2-emulated code; some operating system functions and options introduced in macOS releases since 10.9 are now exposed when available (primarily in the os module); binary wheels built for use with the current 10.9 variant *should* also work with the new variant; the new installer variant includes Tcl/Tk 8.6.10 rather than 8.6.8.\
61\
62Because of the scope of changes needed to fully support 11.0 and Apple Silicon Macs, the new "universal2" variant should be considered
63\f2\i experimental
64\f0\i0  in the 3.9.1 release. You may need to upgrade third-party components, like pip, to later versions once they are released. You may experience differences in behavior in IDLE and other Tk-based applications due to using the newer version of Tk.  As always, if you encounter problems when using this installer variant, please check {\field{\*\fldinst{HYPERLINK "https://bugs.python.org"}}{\fldrslt https://bugs.python.org}} for existing reports and for opening new issues.\
65
66\f1\b \ul \
67Other changes\
68
69\f0\b0 \ulnone \
70For other changes in this release, see the
71\f2\i What's new
72\f0\i0  section in the {\field{\*\fldinst{HYPERLINK "https://www.python.org/doc/"}}{\fldrslt Documentation Set}} for this release and its
73\f2\i Release Notes
74\f0\i0  link at {\field{\*\fldinst{HYPERLINK "https://www.python.org/downloads/"}}{\fldrslt https://www.python.org/downloads/}}.\
75}