Initial Query

Fix this tokenizer keeping it as similar as possible class Tokenizer: def __init__(self, input_str): self.tokens = re.findall(r'\d+|(\+|\-|\*|/|sin|cos|\(|\))', input_str) self.position = 0 def get_next_token(self): if self.position >= len(self.tokens): return None token = self.tokens[self.position] self.position += 1 return token def peek_next_token(self): if self.position >= len(self.tokens): return None return self.tokens[self.position]

LLM Generation

Query

Fix this tokenizer keeping it as similar as possible class Tokenizer: def __init__(self, input_str): self.tokens = re.findall(r'\d+|(\+|\-|\*|/|sin|cos|\(|\))', input_str) self.position = 0 def get_next_token(self): if self.position >= len(self.tokens): return None token = self.tokens[self.position] self.position += 1 return token def peek_next_token(self): if self.position >= len(self.tokens): return None return self.tokens[self.position]

Output

Looking at the tokenizer code, I can see two issues: 1. The `re` module isn't imported 2. The regular expression pattern is problematic - it has a capturing group around operators but not around numbers, which can cause issues with how `re.findall()` returns matches Here's the fixed version: 

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import re

class Tokenizer:
    def __init__(self, input_str):
        # Fixed regex by removing the capturing group - this will match all tokens properly
        self.tokens = re.findall(r'\d+|\+|\-|\*|/|sin|cos|\(|\)', input_str)
        self.position = 0

    def get_next_token(self):
        if self.position >= len(self.tokens):
            return None
        token = self.tokens[self.position]
        self.position += 1
        return token

    def peek_next_token(self):
        if self.position >= len(self.tokens):
            return None
        return self.tokens[self.position]
The main fix is removing the capturing group from the regular expression. When `re.findall()` encounters capturing groups like in the original code, it can behave unexpectedly, returning only the captured portions rather than the full matches. The new pattern will correctly tokenize expressions like "123+456*sin(789)" into a list of tokens.

Extract Code

I extracted the following code from that output: 

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import re

class Tokenizer:
    def __init__(self, input_str):
        # Fixed regex by removing the capturing group - this will match all tokens properly
        self.tokens = re.findall(r'\d+|\+|\-|\*|/|sin|cos|\(|\)', input_str)
        self.position = 0

    def get_next_token(self):
        if self.position >= len(self.tokens):
            return None
        token = self.tokens[self.position]
        self.position += 1
        return token

    def peek_next_token(self):
        if self.position >= len(self.tokens):
            return None
        return self.tokens[self.position]

Run Code Interpreter

Running the following program: 

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import re

class Tokenizer:
    def __init__(self, input_str):
        # Fixed regex by removing the capturing group - this will match all tokens properly
        self.tokens = re.findall(r'\d+|\+|\-|\*|/|sin|cos|\(|\)', input_str)
        self.position = 0

    def get_next_token(self):
        if self.position >= len(self.tokens):
            return None
        token = self.tokens[self.position]
        self.position += 1
        return token

    def peek_next_token(self):
        if self.position >= len(self.tokens):
            return None
        return self.tokens[self.position]





answer = Tokenizer('sin(3+2*4)-cos(15)').tokens
expected = ['sin', '(', '3', '+', '2', '*', '4', ')', '-', 'cos', '(', '15', ')']
assert answer == expected, f'Wrong answer; got {answer} instead of {expected}'
print('All tests passed')
And got the output: All tests passed

Substring Evaluation

Testing if the previous output contains the string All tests passed: True

Initial Query

Fix this tokenizer keeping it as similar as possible class Tokenizer: def __init__(self, input_str): self.tokens = re.findall(r'\d+|(\+|\-|\*|/|sin|cos|\(|\))', input_str) self.position = 0 def get_next_token(self): if self.position >= len(self.tokens): return None token = self.tokens[self.position] self.position += 1 return token def peek_next_token(self): if self.position >= len(self.tokens): return None return self.tokens[self.position]

LLM Generation

Query

Fix this tokenizer keeping it as similar as possible class Tokenizer: def __init__(self, input_str): self.tokens = re.findall(r'\d+|(\+|\-|\*|/|sin|cos|\(|\))', input_str) self.position = 0 def get_next_token(self): if self.position >= len(self.tokens): return None token = self.tokens[self.position] self.position += 1 return token def peek_next_token(self): if self.position >= len(self.tokens): return None return self.tokens[self.position]

Output

Looking at this tokenizer, I can see a few issues that need fixing: 1. The `re` module is used but not imported 2. The pattern in `re.findall()` has an unnecessary capturing group which will cause the matched operators to be captured but not the numbers 3. This will lead to `None` values in the tokens list for numbers Here's the fixed version: 

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import re

class Tokenizer:
    def __init__(self, input_str):
        # Fix the regex pattern by removing the unnecessary capturing group
        self.tokens = re.findall(r'\d+|\+|\-|\*|/|sin|cos|\(|\)', input_str)
        self.position = 0

    def get_next_token(self):
        if self.position >= len(self.tokens):
            return None
        token = self.tokens[self.position]
        self.position += 1
        return token

    def peek_next_token(self):
        if self.position >= len(self.tokens):
            return None
        return self.tokens[self.position]
The key change is removing the parentheses from the second part of the regex pattern. With the original pattern `r'\d+|(\+|\-|\*|/|sin|cos|\(|\))'`, `re.findall()` would only return the contents of the capturing group for operator matches, which would make the token list inconsistent. The fixed pattern ensures all tokens (both numbers and operators) are captured properly.

Extract Code

I extracted the following code from that output: 

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import re

class Tokenizer:
    def __init__(self, input_str):
        # Fix the regex pattern by removing the unnecessary capturing group
        self.tokens = re.findall(r'\d+|\+|\-|\*|/|sin|cos|\(|\)', input_str)
        self.position = 0

    def get_next_token(self):
        if self.position >= len(self.tokens):
            return None
        token = self.tokens[self.position]
        self.position += 1
        return token

    def peek_next_token(self):
        if self.position >= len(self.tokens):
            return None
        return self.tokens[self.position]

Run Code Interpreter

Running the following program: 

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import re

class Tokenizer:
    def __init__(self, input_str):
        # Fix the regex pattern by removing the unnecessary capturing group
        self.tokens = re.findall(r'\d+|\+|\-|\*|/|sin|cos|\(|\)', input_str)
        self.position = 0

    def get_next_token(self):
        if self.position >= len(self.tokens):
            return None
        token = self.tokens[self.position]
        self.position += 1
        return token

    def peek_next_token(self):
        if self.position >= len(self.tokens):
            return None
        return self.tokens[self.position]





answer = Tokenizer('sin(3+2*4)-cos(15)').tokens
expected = ['sin', '(', '3', '+', '2', '*', '4', ')', '-', 'cos', '(', '15', ')']
assert answer == expected, f'Wrong answer; got {answer} instead of {expected}'
print('All tests passed')
And got the output: All tests passed

Substring Evaluation

Testing if the previous output contains the string All tests passed: True