On Fri, 22 Aug 2008 14:39:11 -0700, Emile van Sebille wrote: > Dan wrote: >> I'd suggest that at the >> end of the tutorial, when people have a better general idea of how >> Python works, there would be a Python Gotchas section. >> >> > Hmmm, OK -- mutable defaults, integer division, name mangling... > > I'd think decimal precision is more a general problem than a python > problem, but still one that throws newbies... > > Any other ideas for gotcha's (as opposed to faqs)?
Augmented assignment: x ?= y is not always the same as x = x ? y. Repeated string addition can be very slow. For that matter, so can list addition. Inserting at the beginning of lists is slow. Everything about unicode is a Gotcha! *wink* Raw strings are not designed for Windows paths, they're designed for regexes. Consequently, you can't write the following: r'C:\dir\' list.sort() and list.reverse() return None. sorted() returns a list, but reversed() returns an iterator. urllib2.urlopen() will automatically detect the proxy in your environment and use that. That's usually a feature, but sometimes it can be a gotcha. urllib2 doesn't work well with some HTTPS proxies. This is, I believe, a known bug, but until it is fixed, it can be a gotcha. -- Steven -- http://mail.python.org/mailman/listinfo/python-list