upgrade pyimport to python3

Solution 1:

Python 2.7 is not installed in Ubuntu 20.04 by default, but it can be installed from the terminal. Open the terminal and type:

sudo apt update
sudo apt install --install-suggests python2.7 python-pip python-pytest

python-pytest has been dropped from the default Ubuntu repositories in newer versions of Ubuntu than Ubuntu 20.04.

For Python 3.x:

sudo apt install python3-pip python3-pytest

Example

The first file is the file which should be tested.

fibonacci.py:

def fib(n):
    old, new = 0, 1
    for _ in range(n):
        old, new = new, old + new
    return old

This file will be used by 'pytest' to test fibonacci.py:

test_fibonacci.py:

from fibonacci import fib
def test_fib():
    assert fib(0) == 0
    assert fib(1) == 1
    assert fib(10) == 55

Change directories with cd to the directory that contains fibonacci.py and test_fibonacci.py.

Results of pytest:

============================= test session starts ==============================
platform linux2 -- Python 2.7.17, pytest-3.3.2, py-1.5.2, pluggy-0.6.0
rootdir: /home/karel/Desktop, inifile:
collected 1 item                                                               

test_fibonacci.py .                                                      [100%]

=========================== 1 passed in 0.04 seconds ===========================

_{Source of example code: Python Tutorial: Testing with Pytest}