Command 'pip' not found, but there are 18 similar ones. on ubuntu code example

Example 1: Command 'pip' not found, but there are 18 similar ones.

# Updating package info
sudo apt-get update

# Downloading all upgrades
sudo apt-get upgrade

#Reinstalling pip
sudo apt-get install python3-pip

Example 2: Command 'pip' not found, but there are 18 similar ones

pip3 search stress
stress (1.0.0)                - A trivial utility for consuming system resources.
s-tui (0.8.2)                 - Stress Terminal UI stress test and monitoring tool
stressypy (0.0.12)            - A simple program for calling stress and/or stress-ng from python
fuzzing (0.3.2)               - Tools for stress testing applications.
stressant (0.4.1)             - Simple stress-test tool
stressberry (0.1.7)           - Stress tests for the Raspberry Pi
mobbage (0.2)                 - A HTTP stress test and benchmark tool
stresser (0.2.1)              - A large-scale stress testing framework.
cyanide (1.3.0)               - Celery stress testing and integration test support.
pysle (1.5.7)                 - An interface to ISLEX, a pronunciation dictionary with stress markings.
ggf (0.3.2)                   - global geometric factors and corresponding stresses of the optical stretcher
pathod (0.17)                 - A pathological HTTP/S daemon for testing and stressing clients.
MatPy (1.0)                   - A toolbox for intelligent material design, and automatic yield stress determination
netblow (0.1.2)               - Vendor agnostic network testing framework to stress network failures
russtress (0.1.3)             - Package that helps you to put lexical stress in russian text
switchy (0.1.0a1)             - A fast FreeSWITCH control library purpose-built on traffic theory and stress testing.
nx4_selenium_test (0.1)       - Provides a Python class and apps which monitor      and/or stress-test the NoMachine NX4 web interface
physical_dualism (1.0.0)      - Python library that approximates the natural frequency from stress via physical dualism, and vice versa.
fsm_effective_stress (1.0.0)  - Python library that uses the rheological-dynamical analogy (RDA) to compute damage and effective buckling stress in prismatic shell structures.
processpathway (0.3.11)       - A nifty little toolkit to create stress-free, frustrationless image processing pathways from your webcam for computer vision experiments. Or observing your cat.