How to check if in list in dictionary is a key?

Question

I have a dictionary like this:

a = {'values': [{'silver': '10'}, {'gold': '50'}]}

Now I would like to check if the key 'silver' is in the dictionary:

if 'silver' in a['values']:

But I receive the error:

NameError: name 'silver' is not defined

So how can I achieve that in python?

Answer 1

You can use any.

if any('silver' in d for d in a['values']):
   # do stuff

Answer 2

# Notice that a['values'] is a list of dictionaries.
>>> a = {'values': [{'silver': '10'}, {'gold': '50'}]}

# Therefore, it makes sense that 'silver' is not inside a['values'].
>>> 'silver' in a['values']
False

# What is inside is {'silver': '10'}.
>>> a['values']
[{'silver': '10'}, {'gold': '50'}]

---

# To find the matching key, you could use the filter function.
>>> matches = filter(lambda x: 'silver' in x.keys(), a['values'])

# 'next' allows you to view the matches the filter found. 
>>> next(matches)
{'silver': '10'}

# 'any' allows you to check if there is any matches given the filter. 
>>> any(matches):
True

• filter()
• next()
• any()