user_ids = {
    "John": 12,
    "Anna": 2,
    "Jack": 10

# bad practice

name = "Paul"

if name in user_ids:
    user_id = user_ids[name]
    user_id = None

# good practice

user_id = user_ids.get(name, None)
downloadDownload PNG downloadDownload JPEG downloadDownload SVG

Tip: You can change the style, width & colours of the snippet with the inspect tool before clicking Download!

Click to optimize width for Twitter