find the key associated with a value in a map in python

To find the key associated with a value in a map (dictionary) in Python, you can traverse through the map and compare each value with the given value. When the desired value is found, you can return the corresponding key. Here's an example:

main.py
# Example dictionary
my_dict = {'apple': 1, 'banana': 2, 'orange': 3, 'grape': 4}

# Function to find the key for a given value
def get_key(val):
    for key, value in my_dict.items():
        if val == value:
            return key
 
    return "Key doesn't exist"

# Example usage
print(get_key(3))  # Output: 'orange'
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In this example, the get_key() function takes a parameter val which is the value for which you want to find the key. The function then iterates over the items in the map using the .items() method and compares each value with the given value. If a match is found, the function returns the corresponding key. If the function iterates through the entire map and doesn't find a match, it returns a message indicating that the key doesn't exist.