Question

I have a database “records” within it documents of the type:

{ ..., ..., "grades" : {"good": "40.0", "bad":"22.0"}}

1. I need to get into the document and define a variable as the sum of the “good” and “bad” grades.
2. I don’t know how to get inside the imbedded doc,

I tried :

for i in records:
    variable = i['grade.good']

But that doesn’t seem to work.

Secondly, the grades are strings, and I need to convert them to integers/
Again, tried

total = int(i['grade.good']) + int(i['grade.bad'])

But that it also wrong.
note that my strings are floating points
Help much appreciated!!

Answer 1

instead of i['grade.good'] try i['grade']['good']

retrieve data from dictionary properly

In [11]: d = {"grades" : {"good": "40", "bad":"22"}}

In [12]: d['grades']['good']
Out[12]: '40'

In [13]: total= int(d['grades']['good']) + int(d['grades']['bad'])

In [14]: total
Out[14]: 62

for float number

In [21]: d = {"grades" : {"good": "40.0", "bad":"22.0"}}

In [22]: print float(d['grades']['good']) + float(d['grades']['bad'])
62.0