Hi list!
I'm relatively new to Python, and one thing I can't seem to get over is
the lack of in-expression assignments, as present in many other
languages. I'd really like to know how Python regulars solve the
problems posed by that.
For example, I recently wanted to do this:
if callable(f = getattr(self, "cmd_" + name)):
# Do something with f
elif callable(f = getattr(self, "cmdv_" + name)):
# Do something else with f
However, since I can't do that in Python, I ended up using an extra
local variable instead, like this:
f = getattr(self, "cmd_" + name)
f2 = getattr(self, "cmdv_" + name)
if callable(f):
# Do something with f
elif callable(f2):
# Do something with f2
Another common problem for me are while loops. I would often like to do
this:
while (pos = somestring.find("/")) != -1:
part = somestring[:pos]
somestring = somestring[pos + 1:]
# Handle part
However, that, too, is impossible, and I end up doing something like
this:
while True:
pos = somestring.find("/")
if pos == -1: break
# ...
Which is quite ugly. This might have been a bad example, since
somestring.split() could be used instead, but it's still valid for other
situations.
How would you go about these situations?
Thanks for your time!
Fredrik Tolf
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