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LGTM.com errors #2851

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merged 3 commits into from Oct 10, 2021
Merged

LGTM.com errors #2851

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4b2c563
LGTM.com error: Modification of parameter with default
DimitriPapadopoulos Oct 9, 2021
f554129
LGTM.com error: Wrong number of arguments in a class instantiation
DimitriPapadopoulos Oct 9, 2021
8ce97b2
Add a unit test, fix typos
dannysepler Oct 10, 2021
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2 changes: 1 addition & 1 deletion nltk/internals.py
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Expand Up @@ -242,7 +242,7 @@ def read_str(s, start_position):
try:
return eval(s[start_position : match.end()]), match.end()
except ValueError as e:
raise ReadError("invalid string (%s)" % e) from e
raise ReadError("valid escape sequence", start_position) from e
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should it say "invalid" instead?

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The ReadError documentation reads:

    :param expected: What was expected when an error occurred.

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i see. i guess i am used to errors telling me what's wrong, rather than what is expected. but honestly, i don't even think this code works!! from my own poking around, eval-ing a string with an invalid escape sequence does NOT raise a ValueError, it instead raises a DeprecationWarning. This code dates back to 2008, so perhaps then python used raise an error?

There seems to be active discussion in the python community about this, and they may raise an error down the road.

all of this is to say, i know you're just trying to improve small bits of code quality and not anything more. So I added a quick unit test to check other errors work (they seem to), and this looks fine now!

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I think the error message needs to make it easy for people to fix. Doesn't that mean reporting the invalid string?

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Perhaps, but then that's because the ReadError class is poorly designed. This could be fixed in a different PR.

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ReadError class is defined further up in the file as:

class ReadError(ValueError):
    """
    Exception raised by read_* functions when they fail.
    :param position: The index in the input string where an error occurred.
    :param expected: What was expected when an error occurred.
    """

    def __init__(self, expected, position):
        ValueError.__init__(self, expected, position)
        self.expected = expected
        self.position = position

    def __str__(self):
        return f"Expected {self.expected} at {self.position}"

This PR fixed a bug where constructor was only passed one argument instead of two and the new string displayed to the user in the context of line 245 will be f"Expected valid escape sequence at {start_position}".



_READ_INT_RE = re.compile(r"-?\d+")
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5 changes: 4 additions & 1 deletion nltk/util.py
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Expand Up @@ -1013,7 +1013,7 @@ def skipgrams(sequence, n, k, **kwargs):
######################################################################

# inherited from pywordnet, by Oliver Steele
def binary_search_file(file, key, cache={}, cacheDepth=-1):
def binary_search_file(file, key, cache=None, cacheDepth=-1):
"""
Return the line from the file with first word key.
Searches through a sorted file using the binary search algorithm.
Expand All @@ -1036,6 +1036,9 @@ def binary_search_file(file, key, cache={}, cacheDepth=-1):
end = file.tell() - 1
file.seek(0)

if cache is None:
cache = {}

while start < end:
lastState = start, end
middle = (start + end) // 2
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