Question

Whenever I’m coding something that requires a lot of conditionals, I end up doing this:

if foo:
  if bar:
    if foobar:
      if barfoo:
        if foobarfoo:
          if barfoobar:
            # And forever and ever and ever

I can’t write if foo and bar and foobar and ... because I check for the value list elements (if foo[1] == 'bar') inside of an if somewhere down the line, and if the list index don’t exist, I get an error.

Is there a shortcut to conditionally checking things like this, or an alternative method? Thanks.

Answer 1

I can’t write if foo and bar and foobar and … because I call list elements inside of an if somewhere down the line, and if the list index don’t exist, I get an error.

in python,and short circuits. If the left side of the expression is false, the right side is not evaluated at all.

foo = dict()

if 'bar' in foo and foo['bar']:
    doSomething()