raj.py

## go from here
mylist = [{'pk':1, 'f_id':5,'bool':True}, {'pk':2, 'f_id':2, 'bool':True}, {'pk':3, 'f_id':2, 'bool':False}, {'pk':4, 'f_id':7, 'bool':True}, {'pk':5,'f_id':2,'bool':True}, {'pk':6,'f_id':7, 'bool':False}]
## to here
# mynewlist = [{'pk':1,'f_id':5,'bool':True}, {'pk':5,'f_id':2,'bool':True}]

### filter out Falsey elements
mynewlist = [i for i in mylist if i['bool']]

### dropped Falsey element f_id’s
dropped = [i['f_id'] for i in mylist if not i['bool']]
dropped_twice = []

print(dropped)

mynewnewlist = []
for i in mynewlist:
    if i['f_id'] not in dropped:
        mynewnewlist.append(i)
    elif i['f_id'] in dropped_twice:
        mynewnewlist.append(i)
    else:
        dropped_twice.append(i['f_id'])

### create a dict of desired elements
desired = {}

for n, i in enumerate(mynewnewlist):
    desired[i['f_id']] = n

### get the IDs out (py3k-compatible)
ids = sorted(list(desired.values()))

### create the new new list
mynewnewnewlist = []

for i in ids:
    mynewnewnewlist.append(mynewnewlist[i])

print(mynewnewnewlist)