python evaluate 2 values to eachother if not none-CodePudding

Is it possible to do an evaluation, but only if both values aren't None?

foo=a
bar=a

if foo==bar:
  pass

But I need it as long as foo and bar are not None. Basically if both values are None, don't do the evaluation?

CodePudding user response：

Just compare the values to None with the is operator:

if (foo is None) or (bar is None):
    print("skip comparison")
elif condition(foo, bar):
    print("done comparison")

CodePudding user response：

You can do this:

if not (foo is None and bar is None):
    # do something

or by applying de Morgan's Laws:

if foo is not None or bar is not None:
    # do something