Dictionary Iteration Python

Question

I am newbie in Python.

Dictionary has multiple values.

dc = {1:['2', '3'], 2:['3'], 3:['3', '4']}

If you iterate over 'dc' you find there are three occurrences of '3'. First occurrence is in 1:['2','3']. I would like to iterate over dict so that

if first occurrence of '3' occurs:
  dosomething()

else occurrence of '3' afterwards:#i.e. 2nd time, 3rd time....
  dosomethingelse()

How can I do this in Python

Thank you.

Answer 1

Assuming the values in the dict are the lists:

foundThree = False
for key, val in dc.items():
    if '3' in val and not foundThree:
        foundThree = True
        # doSomething()
    elif '3' in val:
        # doSomethingElse()
    else:
        # doAnotherThing()

---

Edit (update for your comments about finding the first '3' in the list which is the value of a dict item) - this should work:

for key, val in dc.items():
    foundThree = False
    for n in val:
        if n == '3' and not foundThree:
            foundThree = True
            # doSomething()
        elif n == '3': 
            # doSomethingElse()
        else:
            # doAnotherThing()