prompter: self.idx_to_token = list(sorted(set(['<unk>'] + reserved_tokens + [
            token for token, freq in self.token_freqs if freq >= min_freq])))
I want you to rewrite this code without using comprehension

assistant: Here's the rewritten code without using a list comprehension:

`self.idx_to_token = sorted(set(['<unk>'] + reserved_tokens)) for token, freq in self.token_freqs: if freq >= min_freq: self.idx_to_token.append(token)`

prompter: ```
high_frequency_tokens = []
for token, freq in self.token_freqs:
    if freq >= min_freq:
        high_frequency_tokens.append(token)
self.idx_to_token = list(sorted(set(['<unk>'] + reserved_tokens + high_frequency_tokens)))
```

assistant: ```python
self.idx_to_token = list(sorted(set(
  ['<unk>'] + reserved_tokens + map(
    lambda token, _: token,
    filter(
	  lambda _, freq: freq >= min_freq,
	  self.token_freqs
	)
  )
)))
```

prompter: could you add comments to that code?

assistant: Sure, here's a commented version of the code:

```python

# Create a list of unique tokens sorted in alphabetical order
# The list consists of:
#   - '<unk>' token
#   - reserved_tokens
#   - all tokens with frequency greater than or equal to min_freq
self.idx_to_token = list(sorted(set(
  ['<unk>'] + reserved_tokens + map(
    lambda token, _: token,
    # Filter out all tokens whose frequency is less than min_freq
    filter(
	  lambda _, freq: freq >= min_freq,
	  self.token_freqs
	)
  )
)))
```

assistant: # First, we create a set from the list of reserved tokens and the `<unk>` token
token_list = set(['<unk>'] + reserved_tokens)

# Next, we use `filter` to only include tokens that have a frequency greater than or equal to `min_freq`
filtered_tokens = filter(lambda token_freq: token_freq[1] >= min_freq, self.token_freqs)

# Then, we use `map` to extract only the token from the `token_freq` tuple
mapped_tokens = map(lambda token_freq: token_freq[0], filtered_tokens)

# Finally, we add the filtered and mapped tokens to the `token_list` and sort it
token_list = token_list.union(mapped_tokens)
self.idx_to_token = list(sorted(token_list))

assistant: Certainly, here's the code with added comments:
```python
# initialize the list `idx_to_token`
self.idx_to_token = list(sorted(set(
  # first add the `<unk>` token to the list
  ['<unk>'] + reserved_tokens + 
  # map `token` values from filtered `token_freqs`
  map(
    # select only `token` from each tuple
    lambda token, _: token,
    # filter the `token_freqs` list to only keep tokens
    # whose frequency is equal to or greater than `min_freq`
    filter(
	  lambda _, freq: freq >= min_freq,
	  self.token_freqs
	)
  )
)))
```

assistant: # Create a list from the sorted set of tokens 
# where the tokens include the reserved tokens,
# tokens with a frequency greater than or equal to the minimum frequency, and <unk>
self.idx_to_token = list(sorted(set(
  # Add <unk> to the set of tokens
  ['<unk>'] + 
  # Add the reserved tokens to the set of tokens
  reserved_tokens + 
  # Map each token and frequency to just the token 
  # where the frequency is greater than or equal to the minimum frequency
  map(
    lambda token, _: token,
    # Filter the token and frequency pairs where the frequency is greater than or equal to the minimum frequency
    filter(
	  lambda _, freq: freq >= min_freq,
	  self.token_freqs
	)
  )
)))

assistant: The code is creating a list of unique tokens sorted in alphabetical order from a list of tokens and their frequency. The list of tokens is filtered to only include tokens that have a frequency greater than or equal to the specified minimum frequency. The '<unk>' token and a list of reserved tokens are added to the list.

Here's a version of the code without using comprehension:

unique_tokens = set(['<unk>'] + reserved_tokens)
for token, freq in self.token_freqs:
    if freq >= min_freq:
        unique_tokens.add(token)
self.idx_to_token = sorted(list(unique_tokens))

prompter: Can you make it more readable?

assistant: Certainly! Here's a refactored version of the code that makes use of variables to clarify the purpose of each step and improve readability:
```python
reserved_tokens_with_unk = ['<unk>'] + reserved_tokens
unique_tokens = set(reserved_tokens_with_unk)

for token, freq in self.token_freqs:
    if freq >= min_freq:
        unique_tokens.add(token)

filtered_tokens = list(unique_tokens)
sorted_tokens = sorted(filtered_tokens)

self.idx_to_token = sorted_tokens
```