python之确定奇数是否在数字列表中的这段代码有什么问题

def is_odd(number): 
    """The function returns True if the number is odd,  
    False otherwise. 
    """ 
    if number %  2 == 1: 
        return True 
    return False 
 
 
def contains_odd_number(number_list): 
    """The function returns True if number_list contains 
    at least one odd number, False otherwise. 
    """ 
    for num in number_list: 
        if is_odd(num) != True: 
            return False 
        return True