Here goes some markdown.
Read to the end to see the presentation itself!.

Here’s the code output printed as markdown:

cat("### Hello there!")

Hello there!

And the code with no output:

library(ggplot2)
library(ggthemes)

See, no output!

Also python code:

# you would need "reticulate" package for that
def say(x):
    print("I say: " + x)

say("hello")

## I say: hello

hidden code block and table