Greg Ewing wrote: > > Guido: > > > def f(): > > print x # user thinks this should print the global > > # 2000 lines of unrelated code > > for x in "some sequence": # doesn't realize this overrides x > > do_something_with(x) > > Perhaps a warning could be issued if the first reference > to a local textually precedes the first assignment to it? > Would that help catch things like this, without complaining > about too much existing code? The standard library has 4 such occurrences: ftplib.py:678: Variable (macro_lines) used before being set ftplib.py:681: Variable (macro_name) used before being set tokenize.py:148: Variable (strstart) used before being set tokenize.py:149: Variable (endprog) used before being set The line numbers are from CVS version subtract 77/20 for 2.2.1. Neal
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