Raspberry pie upgrade to Python 3.7.3

Install dependency packages

sudo apt-get install -y make build-essential libssl-dev zlib1g-dev   
sudo apt-get install -y libbz2-dev libreadline-dev libsqlite3-dev wget curl llvm 
sudo apt-get install -y libncurses5-dev  libncursesw5-dev xz-utils tk-dev

Find the corresponding version from the Python web page and click to download it.

sudo wget https://www.python.org/ftp/python/3.7.3/Python-3.7.3.tgz

Third, extract the

sudo tar -zxvf Python-3.7.3.tgz

Unzip it and enter the generated directory python-3.7.3

cd Python-3.7.3

Install and compile Python

sudo ./configure && sudo make && sudo make install

6. After installation, create/modify the existing soft connection.
create soft connection (first time)

sudo ln -f /usr/local/bin/python3.7 /usr/bin/python
sudo ln -f /usr/local/bin/pip3.7 /usr/bin/pip

Modify the soft connection (more than once)

sudo ln -sf /usr/local/bin/python3.7 /usr/bin/python
sudo ln -sf /usr/local/bin/pip3.7 /usr/bin/pip

Seven, print version test

python3 -V
pip3 -V


success


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