Trouble with or, and, and not in if statments in Python

Question

For some reason it always passes everything through.

if (keyphrase or keyphrase2 in comment.body) and ("Proof" or "proof" or "roof" or "Roof" or "woof" or "Woof" not in comment.body):
#do stuff

I'm new to Python sorry.

which sample output will not pass your condition? Be more specific about your asking. — R.A.Munna, Oct 12 '18 at 03:12
`x or y in z` is not the correct way to check for multiple conditions. You have to spell out each condition fully, like so: `x in z or y in z` — John Gordon, Oct 12 '18 at 03:14

score 2 · Accepted Answer · answered Oct 12 '18 at 03:14

2

You should use any and all with generator expressions to test multiple values for membership:

if any(k in comment.body for k in (keyphrase, keyphrase2)) and all(k not in comment.body for k in ("Proof", "proof", "roof", "Roof", "woof", "Woof")):

answered Oct 12 '18 at 03:14

blhsing

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score 1 · Answer 2 · answered Oct 12 '18 at 03:15

You may expect:

if (x or y in z):

To be the same as:

if (x in z) or (y in z):

But in reality it's:

if (x) or (y in z):

So any True-like value of x will allow you to enter the if block body.

There are a few options to get what it seems like you're looking for, one is the any function and a generator expression):

if any(thing in z for thing in [x,y])

Trouble with or, and, and not in if statments in Python

2 Answers2