Need help with this Python question

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Python

The following script extracts the text from the https://norvig.com/big.txt file, stores them in a string object, then assigns this string to a variable called data using the requests third-party library.

#!pip install requests
import requests
response = requests.get('https://norvig.com/big.txt')
data = response.text

Run the script above, uncomment the first line if you need to install the library on your machine, then define and implement a function that returns the followings:

A) The total number of unique words and unique characters
B) The top ten most frequent words and the number of times these words appear in the text.

What I have tried:

#!pip install requests
import requests
response = requests.get('https://norvig.com/big.txt')
data = response.text

data = data.lower()
words = data.split()
words = [word.strip('.,!;()[]') for word in words]
words = [word.replace("'s", '') for word in words]
unique = []
for word in words:
    if word not in unique:
        unique.append(word)
unique.sort()
print("The total number of unique words and unique characters are:",unique.count(value))

I have read on the internet that if you want to count the total number of unique characters just put 'value' in the count function but this gave me an error. What is the right way of doing this? I appreciate your input, thanks