Cheryl Sabella <[email protected]> added the comment:
IDLE just added similar functionality to pyparse (issue 32940) using:
class ParseMap(dict):
def __missing__(self, key):
return 120 # ord('x')
# Map all ascii to 120 to avoid __missing__ call, then replace some.
trans = ParseMap.fromkeys(range(128), 120)
trans.update((ord(c), ord('(')) for c in "({[") # open brackets => '(';
trans.update((ord(c), ord(')')) for c in ")}]") # close brackets => ')'.
trans.update((ord(c), ord(c)) for c in "\"'\\\n#") # Keep these.
code = code.translate(trans)
Of course, all that is probably too much for a docs example, but it uses a
mapping without the side effect of defaultdict. I wonder if defining the dict
subclass with __missing__ and then the example of keeping only lowercase
letters would work for the docs?
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nosy: +csabella
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<https://bugs.python.org/issue28612>
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