回答編集履歴
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追記：実行例
test
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pi@raspberrypi:~ $
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```
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```
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- `pyenv` の準備
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```
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sudo apt update && sudo apt upgrade -y
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sudo apt-get install -y build-essential libncursesw5-dev libgdbm-dev libc6-dev zlib1g-dev libsqlite3-dev tk-dev libssl-dev openssl libbz2-dev libreadline-dev
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git clone https://github.com/pyenv/pyenv.git ~/.pyenv
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echo 'export PYENV_ROOT="$HOME/.pyenv"' >> ~/.bash_profile
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echo 'export PATH="$PYENV_ROOT/bin:$PATH"' >> ~/.bash_profile
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echo 'eval "$(pyenv init -)"' >> ~/.bash_profile
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source ~/.bash_profile
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#
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# libssl1.0-devに差し替える
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sudo apt install -y libssl1.0-dev libssl1.0.2
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```
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- 実行例 : (2017-08-16-raspbian-stretch使用)
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```
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pi@raspberrypi:~ $ cat /etc/issue
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Raspbian GNU/Linux 9 \n \l
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pi@raspberrypi:~ $ cat /etc/debian_version
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9.1
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pi@raspberrypi:~ $ cat /etc/os-release
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PRETTY_NAME="Raspbian GNU/Linux 9 (stretch)"
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NAME="Raspbian GNU/Linux"
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VERSION_ID="9"
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VERSION="9 (stretch)"
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ID=raspbian
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ID_LIKE=debian
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HOME_URL="http://www.raspbian.org/"
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SUPPORT_URL="http://www.raspbian.org/RaspbianForums"
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BUG_REPORT_URL="http://www.raspbian.org/RaspbianBugs"
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pi@raspberrypi:~ $ uname -a
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Linux raspberrypi 4.9.41-v7+ #1023 SMP Tue Aug 8 16:00:15 BST 2017 armv7l GNU/Linux
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pi@raspberrypi:~ $
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pi@raspberrypi:~ $
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pi@raspberrypi:~ $ time pyenv install 3.5.1
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Downloading Python-3.5.1.tar.xz...
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-> https://www.python.org/ftp/python/3.5.1/Python-3.5.1.tar.xz
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Installing Python-3.5.1...
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Installed Python-3.5.1 to /home/pi/.pyenv/versions/3.5.1
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154
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real 15m17.827s
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user 34m11.930s
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sys 1m47.100s
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pi@raspberrypi:~ $
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pi@raspberrypi:~ $
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pi@raspberrypi:~ $ python --version
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Python 2.7.13
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pi@raspberrypi:~ $ python3 --version
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Python 3.5.3
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pi@raspberrypi:~ $ pyenv local 3.5.1
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pi@raspberrypi:~ $ pyenv versions
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system
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* 3.5.1 (set by /home/pi/.python-version)
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pi@raspberrypi:~ $ python --version
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Python 3.5.1
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pi@raspberrypi:~ $ python3 --version
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Python 3.5.1
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pi@raspberrypi:~ $ pyenv which python
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/home/pi/.pyenv/versions/3.5.1/bin/python
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pi@raspberrypi:~ $ pyenv which python3
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/home/pi/.pyenv/versions/3.5.1/bin/python3
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pi@raspberrypi:~ $ pyenv local system
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pi@raspberrypi:~ $ pyenv which python
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/usr/bin/python
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pi@raspberrypi:~ $ pyenv which python3
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/usr/bin/python3
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pi@raspberrypi:~ $
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```
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