three ways of performing lookup

three.py

# THE DATA 
# L is a list of dicts (all have the same keys)
L=[{'name':'e'+str(i), 
    'explanation':'objection1',
    'law':(),
    'CS':('barcelona','Vigo')} for i in range(1000000)]


# option 1: generator
next(item for item in L if item["name"] == myvalue)
# option 2: comprehension
[d for d in L if d["name"] == myvalue]
# option 3: pandas
df = pd.DataFrame(L).set_index('name')
df.loc[[myvalue]].reset_index().to_dict('records')