How to extract a sublist from another list based on value with indices

Question

I need to get a sublist called invalids from another list called opened_list that pulls the records containing the value 12 along with their index in the list. I have tried the below code

x = opened_list
print (x.index(-1))

I want the output to be something like

• 25 12
• 32 12
• 74 12

Answer 1

a=[1,12,3,4,12,5,12]                                                    
b=[]                                                                    
for idx,item in enumerate(a): 
    if item==12: b.append((idx,item)) 
print(b)                                                                

prints: [(1, 12), (4, 12), (6, 12)]