Python list elements in

Question

I have a Flask controller action with the following input validation routine, is there a way to write it more succinctly?

if 'firstName' and \
    'lastName' and \
    'age' \
not in request.json:
    return flask.abort(400)

Perhaps something like this, although I'm not sure how to get the and operators to work:

mandatory_fields = ['firstName', 'lastName', 'age']
if mandatory_fields not in request.json:
        return flask.abort(400)

Is the second code snippet possible?

Hi, can you provide me with an example of your request.json print out... — GCien, Jun 15 '18 at 21:11
Your original example doesn't work the way you think it does. — Mark Ransom, Jun 15 '18 at 21:12
Is `request.json` a string, or is it some other kind of object? I feel that this may have been closed inappropriately. — Mark Ransom, Jun 15 '18 at 21:15
It was a dictionary, I think I understand what you mean if the boolean logic above works in a similar fashion to JavaScript. — 00101010, Jun 15 '18 at 21:28

score 1 · Accepted Answer · answered Jun 15 '18 at 21:13

1

You can use all() method like this:

fields = ["a", "b", "c"]
a_hash = {"a": 1, "b": 2, "c": 3, "d": 4}
if all(field in a_hash for field in fields):
    print("All good")
# prints "All good"

fields = ["a", "b", "c", "e"]
a_hash = {"a": 1, "b": 2, "c": 3, "d": 4}
if any(field not in a_hash for field in fields):
    print("All bad")
# prints "All bad"

answered Jun 15 '18 at 21:13

mishik

9,973
9
45
67

Thank you, I added a not e.g. if not all(...) and it worked a treat! – 00101010 Jun 15 '18 at 21:22

Python list elements in

1 Answers1