DevNet Associate DEVASC 200-901 Official Certification Guide by Adrian Iliesiu (z-lib.org)

The output includes the name, version, and a brief
description of what the package does.

To install a specific version of a package, you can specify
a version number or a minimum version so that you can
get recent bug fixes:

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pip install package==1.1.1. To install a specific

version

pip install package>=1.0 To install a version

greater than or

equal to 1.0

When you download sample code, if there are package
dependencies, there is usually a readme file that lists
these requirements.

Using a requirements.txt file included with your code is
another essential good practice. Such a file makes it
simpler to get your Python environment ready to go as
quickly as possible. If you have a requirements.txt file
included with your code, it will give pip a set of packages
that need to be installed, and you can issue this one
command to get them loaded:

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pip install -r requirements.txt

The requirements.txt file is just a list that maps Python
package names to versions. Example 3-1 shows what it
looks like.

Example 3-1 Contents of requirements.txt

ansible==2.6.3

black==19.3b0

flake8==3.7.7

genie==19.0.1

ipython==6.5.0