def is_int(x):
    if is_int():
        return True
        return False

it says that 
Oops, try again. Does your is_int function take exactly one argument (an integer)? Your code threw a "is_int() takes exactly 1 argument (0 given)" error.


is_int() doesn't return true or false. You need to fix your if statement.


We won't be calling the function on itself. If you check the Hint, you will see an excellent example.

return x % 1 == 0    # return value will be True or False


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