How to download and install Python 3.5 in Raspbian

Question

Tried to use

sudo apt-get install python3.5

and it's telling me that it can't find it. Have tried updating. Not sure what else to do.

Answer 1

I tried installing the python3.5.2 with the below steps and I was successful.

1. wget https://www.python.org/ftp/python/3.5.2/Python-3.5.2.tar.xz
2. tar -xvf Python-3.5.2.tar.xz
3. cd Python-3.5.2
4. ./configure
5. make
6 make altinstall

Once the installation is completed use which python3.5 command to get the binary location

In my case it was installed in the location /usr/local/bin/python3.5.

To get into the REPL of 3.5 type python3.5 on your terminal. The existing python distribution remains intact without issues. Verify that using the python. I have tried installing python 3.4 and 3.5 versions.

pi@raspberrypi:/etc/openhab/configurations $ python -V
Python 2.7.9
pi@raspberrypi:/etc/openhab/configurations $ python3.5 -V
Python 3.5.2
pi@raspberrypi:/etc/openhab/configurations $ python3.4 -V
Python 3.4.2

Also as time permits I suggest you to read the article https://stackoverflow.com/questions/16018463/difference-in-details-between-make-install-and-make-altinstall.

It should work. The only issue while i faced during installation is the time taken for the whole process. It took almost 3 hours because a lot of time is consumed in compiling the binaries and then installing python.

Answer 2

First of all you need to get your dependencies right. That mostly depend on what you have already installed previously. So for a vanilla fresh Raspbian (jessie), you will (approximately) need to make sure you have these:

sudo apt-get install build-essential libc6-dev
sudo apt-get install libncurses5-dev libncursesw5-dev libreadline6-dev
sudo apt-get install libdb5.3-dev libgdbm-dev libsqlite3-dev libssl-dev
sudo apt-get install libbz2-dev libexpat1-dev liblzma-dev zlib1g-dev

The rest is simple. First download and extract...

cd $HOME
wget https://www.python.org/ftp/python/3.5.2/Python-3.5.2.tgz
tar -zxvf Python-3.5.2.tgz

...and then compile with:

cd Python-3.5.2
./configure       # 3 min 13 s
# We have 4 processors, so let's use 4 threads
make -j4          # 8 min 29 s
sudo make install # ~ 4 min

Save your SD card space:

cd ..
sudo rm -fr ./Python-3.5.2*

Now test with:

cd
python3 --version
# output: "Python 3.5.2"
pip3 list
# output: 
# pip (8.1.1)
# setuptools (20.10.1)
# You are using pip version 8.1.1, however version 8.1.2 is available.
# You should consider upgrading via the 'pip install --upgrade pip' command.

Update your default pip installation with:

sudo pip3 install -U pip
sudo pip3 install -U setuptools

Done!

Answer 3

Combining several different posts finally worked for me to Install Python 3.6.12 on Jessie Raspian.

Install Dependencies:

sudo apt-get install build-essential libc6-dev
sudo apt-get install libncurses5-dev libncursesw5-dev libreadline6-dev
sudo apt-get install libdb5.3-dev libgdbm-dev libsqlite3-dev libssl-dev
sudo apt-get install libbz2-dev libexpat1-dev liblzma-dev zlib1g-dev

Install Alternative Compiler:

sudo apt install clang

Get Python Source Code, configure, make and install:

cd
wget https://www.python.org/ftp/python/3.6.12/Python-3.6.12.tgz
tar xf Python-3.6.12.tgz
cd Python-3.6.12
./configure CC=clang CXX=clang++
sudo make
sudo make install

I don't recommend trying to make Python 3.7 or greater as it requires a later version of OpenSSL than is installed on Jessie. I tried to get an updated version to install, but gave up after lots of attempts.