Delete multiple dictionaries in a list

Question

I have been trying to delete multiple dictionaries in a list but I can only delete one at a time.

Below is the main code I am working on. Records is the list of dictionaries. I want to delete dictionaries that have 0 in them.

Records = [{'Name':'Kelvin','Price': 0},{'Name': 'Michael','Price':10}]

I want to delete dictionaries with Prices of 0

def deleteUnsold(self):
    for d in records:
        for key, value in d.items():
            if d['Price'] == 0:
                records.remove(d)

Answer 1

Use a list comprehension with an if condition

>>> Records = [{'Name':'Kelvin','Price': 0},{'Name': 'Michael','Price':10}]
>>> [i for i in Records if i['Price'] != 0]
[{'Price': 10, 'Name': 'Michael'}]

Check out if/else in Python's list comprehension? to learn more about using a conditional within a list comprehension.

---

Note that [as mentioned below] you can also leave out checking for the value 0. However this also works if Price is None, hence you may use the first alternative if you are not sure of the data type of the value of Price

>>> [i for i in Records if i['Price']]
[{'Price': 10, 'Name': 'Michael'}]

Answer 2

You can use filter:

print filter(lambda x:x['Price']!=0,Records)