With Ghost you can easily embed code in posts. Although, with markdown language you face lack of code formatting and get code block without syntax highlighting. After small research I opted for Prism – syntax highlighting engine.

# Python
import pandas as pd
df = pd.DataFrame()
Out of the box Ghost code block

Adding Prism Syntax Highlighting to your blog

Code Injection is the simplest way to add Prism to you theme.

Add the following lines of code to the Site Header section:

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/prism/1.16.0/themes/prism-okaidia.min.css" integrity="sha256-Ykz0nNWK7w4QWJUYR7OraN4773aMB/11aMt1nZyrhuQ=" crossorigin="anonymous" />

    <style type="text/css" media="screen">
        .post-full-content pre strong {
            color: white;
        }
        .post-full-content pre {
            line-height: 1;
        }
        .post-full-content pre code {
            white-space: pre-wrap;
            hyphens: auto;
            line-height: 0.7;
            font-size: 0.7em;
        }
    </style>

Another injection to the Site Footer:

<script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.16.0/components/prism-markup-templating.min.js" integrity="sha256-41PtHfb57czcvRtAYtUhYcSaLDZ3ahSDmVZarE0uWPo=" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.16.0/components/prism-javascript.min.js" integrity="sha256-KxieZ8/m0L2wDwOE1+F76U3TMFw4wc55EzHvzTC6Ej8=" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.16.0/components/prism-css.min.js" integrity="sha256-49Y45o2obU1Yv4zkYDpMDyAa+D9sgKNbNy4ZYGRl/ls=" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.16.0/components/prism-sql.min.js" integrity="sha256-zgHnuWPEbzVKrT72LUtMObJgbwkv0VESwRfz7jpdsq0=" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.16.0/components/prism-sass.min.js" integrity="sha256-3oigyyaPovKMS9Ktg4ahAD1R6fOSMGASuA03DT8IrvU=" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.16.0/components/prism-python.min.js" integrity="sha256-zXSwQE9cCZ8HHjjOoy6sDGyl5/3i2VFAxU8XxJWfhC0=" crossorigin="anonymous"></script>

Find the link to specific library and list it in your injection: https://cdnjs.com/libraries/prism.

And then it looks like this:

# Python
import pandas as pd  
df = pd.DataFrame()
Set Pandas dataframe