# Nested dictionary for loop with def (INDENTENTION PROBLEM)

## Question:

I am learning Python with the 2°Ed. Automate the boring stuff with python, and I came across with a indentention problem.

Can someone explain what I am doing wrong?

I am trying to add a indentention after the for loop to insert the num_brought value, but it keeps getting an error: TypeError: unsupported operand type(s) for +: ‘int’ and ‘str’.

Book code:

```
allGuests = {'Alice': {'apples': 5, 'pretzels': 12},
'Bob': {'ham sandwiches': 3, 'apples': 2},
'Carol': {'cups': 3, 'apple pies': 1}}
def totalBrought(guests, item):
numBrought = 0
for k, v in guests.items():
numBrought = numBrought + v.get(item, 0)
return numBrought
print('Number of things being brought:')
print(' - Apples ' + str(totalBrought(allGuests, 'apples')))
print(' - Cups ' + str(totalBrought(allGuests, 'cups')))
print(' - Cakes ' + str(totalBrought(allGuests, 'cakes')))
print(' - Ham Sandwiches ' + str(totalBrought(allGuests, 'ham sandwiches')))
print(' - Apple Pies ' + str(totalBrought(allGuests, 'apple pies')))
```

My code:

```
all_guests = {
'Alice': {'apple': 1, 'ham': 2},
'Joe': {'potato': 7, 'beer': 7},
'Carl': {'apple': 3, 'beer': 'none'}}
def total_brought(guest, item):
num_brought = 0
for k, v in guest.items():
num_brought = num_brought + v.get(item, 0)
return num_brought
print('Total brought: ')
print('Apples: ' + str(total_brought(all_guests, 'apple')))
print('Beer: ' + str(total_brought(all_guests, 'beer')))
print('Ham: ' + str(total_brought(all_guests, 'ham')))
print('Potato: ' + str(total_brought(all_guests, 'potato')))
```

## Answers:

The issue is your data, not your indentation. On this line

```
num_brought = num_brought + v.get(item, 0)
```

you add `num_brought`

(a number) to a value of one of the dictionaries in `allGuests`

. In the book, all of those values are numbers too, but in your data, one of them is the string `'none'`

(`allGuests['Carl']['beer']`

).

The solution is to just change that data to `0`

, as the number zero means having nothing, or "none":

```
all_guests = {
'Alice': {'apple': 1, 'ham': 2},
'Joe': {'potato': 7, 'beer': 7},
'Carl': {'apple': 3, 'beer': 0}}
def total_brought(guest, item):
num_brought = 0
for k, v in guest.items():
num_brought = num_brought + v.get(item, 0)
return num_brought
print('Total brought: ')
print('Apples: ' + str(total_brought(all_guests, 'apple')))
print('Beer: ' + str(total_brought(all_guests, 'beer')))
print('Ham: ' + str(total_brought(all_guests, 'ham')))
print('Potato: ' + str(total_brought(all_guests, 'potato')))
```

Alternatively, you can check for the value `'none'`

and change it to zero in your function:

```
all_guests = {
'Alice': {'apple': 1, 'ham': 2},
'Joe': {'potato': 7, 'beer': 7},
'Carl': {'apple': 3, 'beer': 'none'}}
def total_brought(guest, item):
num_brought = 0
for k, v in guest.items():
val = v.get(item, 0)
if val == 'none':
val = 0
num_brought = num_brought + val
return num_brought
print('Total brought: ')
print('Apples: ' + str(total_brought(all_guests, 'apple')))
print('Beer: ' + str(total_brought(all_guests, 'beer')))
print('Ham: ' + str(total_brought(all_guests, 'ham')))
print('Potato: ' + str(total_brought(all_guests, 'potato')))
```