Need help pymongo python

i know how i can increment value in pymongo but when i am trying to inc value in object of array list i can’t able to inc

for example
look like this

{
   '_id':'1',
   'requests';[
   { 'date':'48','count':1}
]
}

i want to inc value and want like this

{
   '_id':'1',
   'requests';[
   { 'date':'48','count':2}
]
}

please give me solutions for Pymongo in python