UnboundLocalError: local variable 'f' referenced before assignment

This error occurs when a local variable is referenced before it has been assigned a value. Here is an example:

def my_function():
    print(f)     # accessing the value of 'f' before it has been assigned
    f = 10       # assigning a value to 'f'

my_function()

In this example, we are trying to print the value of the variable 'f' before it has been assigned a value. This will result in an UnboundLocalError. To fix this error, we need to assign a value to 'f' before accessing it. Here is the corrected code:

def my_function():
    f = 10       # assigning a value to 'f'
    print(f)     # accessing the value of 'f' after it has been assigned

my_function()

Now the value of 'f' will be assigned before it is accessed, and the program will run without any errors.