How would one install a side by side installation of Python 2.x, and Python 3.x

python

Solution 1:

Python 3 is available from the repositories and can be installed side by side with Python 2:

sudo apt-get install python3 python

You can use the -V switch to find out the minor version numbers:

$ python3 -V
Python 3.1.2

$ python -V
python 2.6.6

Related

Formula for distance between Incenter and Orthocenter.
How to solve definite integral in range of complex number, such as $ \int_{-1-i}^{1+i} (1) dx $? [duplicate]
Show that $x^4-8x^2+(1-m)x+1-c=(x-a)^2(x-b)^2$
Rank normal form of a matrix
Maximum number of vertices in connected graph with every degree at most 6 and distance between any two vertices at most 2
A real vector space with an almost complex structure vs its complexification
Convert numbers between 0 and infinity to numbers between 0.0 and 1.0
Prove this function is $\mathcal{B}(\mathbb{R}^d)$ measurable
Control the sectional curvature
Can $ I_n(z) = (\frac{z}{2})^n\sum_{k=0}^\infty\frac{(-1)^k}{k!(n+k)!}\frac{1}{k+(n+k)+1}(\frac{z}{2})^{2k}$ be expressed by the Bessel function?
Finding the norm of the linear functional $f(x)=\int_{-1}^0 x(t) \, dt - \int_0^1 x(t) \, dt$ on $C[-1,1]$
How many solutions does $f'(x)=1/2$ have, given that $|f(x)-f(y)|\ge|x-y|$?