Lambda in python with example

Lambda:

In the below example you can see two methods have been created and clearly explained to show how Lambda works

friends =  [

    {"name": "Ram", "age":26}, 

    {"name": "Raju", "age":30}

]

#method with for loop 

def findAge(name):

    for friend in friends:

        if(friend["name"] == name):

            return friend

    

    return f"{name} not found"

#method with Lambda expression 

def findAgeLambda(name):

    friend = next(filter(lambda x: x["name"] == name, friends))

    return friend

print(findAge("Ram"))

print(findAgeLambda("Raju"))  

Output:

{'name': 'Ram', 'age': 26}

{'name': 'Raju', 'age': 30}

list indices must be integers or slices, not str error in python

Below is an example to elaborate the error and for an better understanding.

Eg:

shops = [{

    "name": "Anand Motors",

    "cars": [

        {

            "name":"Ferrari",

            "Price": 25000

        },

        {

            "name": "Benz",

            "price": 15000

        }

    ]}  

]

The above dictionary is referred as list, when to try to access the dictionary data using string.

name = "Anand Motors"

print(shops[name])

The above code gives error.

Solution or fix:

name = "Anand Motors"

print(next(shop for shop in shops if shop["name"] == name))

The above code will fix this error.