How to search for a value in a dictionary stored in a list

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I am creating a monopoly like game and in this, I have a list which is for the players in this I have a dictionary for each player it is set up like this:

players.append[
{
   "playerName": John,
   "money": 1500,
   "properties": ["Mediterranean Ave"],
   "railroads": ["Reading Railroad"],
   "inJail":   False
}
{
   "playerName": Smith,
   "money": 1500,
   "properties": ["Baltic Ave"],
   "railroads": ["B. & O. Railroad"],
   "inJail":   False
}
]

so whenever a player lands on a property I want to check if anyone owns it and if anyone owns it who does, I tried using the count function but that did not work I also tried using the get function for dictionaries but that also failed what ways may I search for it.

You can try this

def is_property_owned(property_name):
    for p in players:
        if property_name in p['properties']:
            return p['playerName'] #Returns the owner of property
    return None # Returns None, if no one is owning it

Python, Python | Removing dictionary from list of dictionaries. manjeet_04. Check out this Author's contributed articles. If you like GeeksforGeeks and� Method #2 : Using list comprehension . This method also uses the method similar to above method, just binds the logic into one list and returns the key value pairs of dictionary as tuples of key and value in the list.

If this operation is going to be frequently executed, you may want to have another dictionary, say props, that describes who owns which property:

props = {}
for p in players:
    props.update({x: p['playerName'] for x in p['properties']})

Then finding the owner of a property is a matter of looking up in the dictionary:

owner =  props.get("Baltic Ave", None)

The dictionary must be updated every time the property changes the owner, e.g.:

props["Baltic Ave"] = "Smith"

Or:

del(props["Mediterranean Ave"])

Python, For this, we just use naive check and compare and return the result once we find the suitable match and break for rest of dictionaries. filter_none. A Computer Science portal for geeks. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions.

You can use a list comprehension to retrieve a list of people owning a given property:

def property_owner(prop):
    return [dic['playerName'] for dic in players if prop in dic['properties']]

property_owner('Mediterranean Ave') # ['John']
property_owner('Whitehouse') # []

Manipulating Lists and Dictionaries in Python, A dictionary is a mutable, unordered set of key-value pairs where its key, much like you would look up a word in a school dictionary. The real power of Python lists can be better appreciated when we use them to store� Return value from values() values() method returns a view object that displays a list of all values in a given dictionary. Example 1: Get all values from the dictionary

20. Dictionaries — How to Think Like a Computer Scientist: Learning , If we wanted to find a value associated with a key, we would have to iterate over Another way to create a dictionary is to provide a list of key:value pairs using the A previously computed value that is stored for later use is called a memo. dict.fromKeys () accepts a list and default value. It returns a dictionary with items in list as keys. All dictionary items will have same value, that was passed in fromkeys (). If no default value was passed in fromKeys () then default value for keys in dictionary will be None.

Dictionaries, python_words = {'list': 'A collection of values that are Let's take a look at the order that results from a simple call to dictionary.keys(): changed the way the dictionary is stored at all. Find the Value Using Index Operator in Python In addition to the above method, you can also get the values by keys in Dictionary. You have to use the Python index operator ([]) to find the value of the given key. The index operator requires a single argument to pass.

If the key is already present, the program displays a message. If the key is not present, the program calls the object’s Add method, passing it the new key and value. If you enter a key and click the Find button, the following code displays the corresponding value in the Dictionary. // Look up a value.

Comments
  • Your players called and said they want to be a class.