def is_valid_int(int_to_test):
    """
    Check if int_to_test is a valid integer
    
    Parameters
    ----------
    int_to_test : str

    Returns
    -------
    'True' if int_to_test if a valid int, otherwise 'False'

    Examples
    --------
    >>> is_valid_int('73')
    True
    >>> is_valid_int('5g8vdFp')
    False
    """
    try:
        int_obj = int(int_to_test)
    except ValueError:
        return False
    
    return str(int_obj) == int_to_test