I am trying to retrieve rick and morty json data from the website and I keep getting this error: "NameError: name 'null' is not defined"

Question

When I try to run the following code using Spark (databricks) in python code:

from urllib import request as url

request = url.Request('https://rickandmortyapi.com/api/character/')
Rick = eval(
    url.urlopen(request).read().decode('utf-8').strip()
  )

# convert to a dataframe
Morty = spark.createDataFrame(Rick)
display(Morty)

I get an error message that says:

NameError: name 'null' is not defined
---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
<command-2109831538106701> in <module>
      4 # retrieve json data from website
      5 request = url.Request('https://rickandmortyapi.com/api/character/')
----> 6 Rick = eval(
      7     url.urlopen(request).read().decode('utf-8').strip()
      8   )

<string> in <module>

NameError: name 'null' is not defined

How do I fix this?