How to make function execution by key from Python 3 dictionary?

Question

Python

There is a dictionary where each key is a letter and each value is a function. The user is prompted for a letter, how to execute the function that corresponds to the entered letter?
Example of non-working code:

def main():
    while True:
        key = str(input("Press R to read a file\nPress E to enter data\nPress L to leave the program\n"))
        key = key.lower()
        execute(key)

def execute(command):
    return {
        'r' : readfile(),
        'e' : enterdata(),
        'l' : exit()
    }.get(command, "Command not found")

def readfile():
    #Действия

def enterdata():
    #Действия

def exit():
    #Действия

main()

If I understand correctly, the code here returns the entire list, so the result of the execution will be that all functions act in turn.

Answer 1

UPD: Hurrah, solved! I had to bang my head, but it turned out gracefully

def main():
    while True:
        key = str(input("Press R to read a file\nPress E to enter data\nPress L to leave the program\n"))
        key = key.lower()
        execute(key)


def readfile():
    #Действия


def enterdata():
    #Действия


dictOfCommands = {
    'r': readfile,
    'e': enterdata,
    'l': exit
}


def execute(command):
    dictOfCommands[command]()


main()