how install python version 3.9.0 in macOS Big Sur 11.2

I bought new mac book pro and set up my env.

But pyenv install 3.9.0 is not working...

新しいMacBook Proを購入してセットアップ！

しかし、pyenv install 3.9.0 がerror。lol

python-build: use openssl@1.1 from homebrew
python-build: use readline from homebrew
Downloading Python-3.9.0.tar.xz...
-> https://www.python.org/ftp/python/3.9.0/Python-3.9.0.tar.xz
Installing Python-3.9.0...
python-build: use readline from homebrew

BUILD FAILED (OS X 11.2 using python-build 20180424)

Inspect or clean up the working tree at /var/folders/kl/fg7hszwx3hldt471m8jdkr0m0000gn/T/python-build.20210208235816.6951
Results logged to /var/folders/kl/fg7hszwx3hldt471m8jdkr0m0000gn/T/python-build.20210208235816.6951.log

Last 10 log lines:
checking for python3.9... python3.9
checking for --enable-universalsdk... no
checking for --with-universal-archs... no
checking MACHDEP... "darwin"
checking for gcc... clang
checking whether the C compiler works... no
configure: error: in `/var/folders/kl/fg7hszwx3hldt471m8jdkr0m0000gn/T/python-build.20210208235816.6951/Python-3.9.0':
configure: error: C compiler cannot create executables
See `config.log' for more details
xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun

I see...

BUILD FAILED (OS X 11.2 using python-build 20180424)

Okey.

review my setup.

Lets installed Homebrew!!!

and then

brew install pyenv

then above message "Build Failed" showed up.

I had no idea what I miss. Because I usually used to use windows OS.

I checked same problem who had at stack overflow.

I tried install
とりあえずxcodeが足りなかったわけなのね！

xcode-select --install

then my problem was solved. XD
checked version

pyenv versions
pyenv global 3.9.0

execute my setting

zsh -l

annnnnnnd

python --version

done!!!
you can checked also from this command too ↓

pyenv versions

have happy python life :)

xoxo