I often find myself writing if / elif / else constructs in python, and I want to include options which can occur, but for which the corresponding action is to do nothing. I realise I could just exclude those if statements, but for readability I find it helps to include them all, so that if you are looking through the code you can see what happens as a result of each option. How do I code the no-op? Currently, I'm doing it like this:
no_op = 0
if x == 0:
y = 2 * a
elif x == 1:
z = 3 * b
elif x == 3:
no_op
(The code is actually quite a bit longer than that, and more complicated. This is just to illustrate the structure).
I don't like using a variable as a no-op, but it's the neatest way I could think of. Is there a better way?
This question is related to
python
Use pass for no-op:
if x == 0:
pass
else:
print "x not equal 0"
And here's another example:
def f():
pass
Or:
class c:
pass
If you need a function that behaves as a nop, try
nop = lambda *a, **k: None
nop()
Sometimes I do stuff like this when I'm making dependencies optional:
try:
import foo
bar=foo.bar
baz=foo.baz
except:
bar=nop
baz=nop
# Doesn't break when foo is missing:
bar()
baz()
How about pass?
Source: Stackoverflow.com