重新安装 python 过程

You should compile python 3.4 and use venv for python3 environment:

Check if you have installed required dependencies:
sudo apt-get install build-essential

sudo apt-get install libc6-dev libreadline-dev libz-dev libncursesw5-dev libssl-dev libgdbm-dev libsqlite3-dev libbz2-dev liblzma-dev tk-dev
Download and compile Python 3.4.3. You should not sudo make install it because we don’t need it systemwide:

wget https://www.python.org/ftp/python/3.4.3/Python-3.4.3.tgz
tar -xvf Python-3.4.3.tgz
cd Python-3.4.3
./configure && make
This may take a while on pi.
While you still in current folder, create python environment:
mkdir -p ~/.virtualenvs
./python -m venv ~/.virtualenvs/py34
launch your virtual environment:
source ~/.virtualenvs/py34/bin/activate
Now you have Python 3.4 and pip inside of it. Try:

pip install bpython

To exit virtual environment use:

deactivate

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