python - Python中区分 'character'和 'numeric'数据类型

Question

我想知道在 Python 中是否有一种简单的方法来区分字符和数字数据类型(例如 int/double/float 等)。理想情况下，我希望能够区分标量和列表。

简而言之，我希望能够编写一个函数 easy_type 来执行以下操作:

>>> easy_type(["hello", "world"])  
   "character"
>>> easy_type("hello")  
   "character"
>>> easy_type(['1.0', '0.0'])  
   "numeric"
>>> easy_type([0, 1, 2])  
   "numeric"
>>> easy_type(0.100)  
   "numeric"

Answer 1

由于您有多种类型的数据，您可能希望使用递归函数获取单个项目的类型，就像这样

def get_type(data):
    if isinstance(data, list):
        types = {get_type(item) for item in data}
        # If all elements of the list are of the same type
        if len(types) == 1:
            return next(iter(types))
        # if not, return "multiple"
        else:
            return "multiple"
    elif isinstance(data, str):
        # Check if the string has only numbers or it is a float number
        return "numeric" if data.isdigit() or is_float(data) else "character"
    elif isinstance(data, int) or isinstance(data, float):
        return "numeric"

辅助函数is_float是这样定义的

def is_float(data):
    try:
        float(data)
        return True
    except ValueError:
        return False

和测试，

assert(get_type(["hello", "world"]) == "character")
assert(get_type("hello") == "character")
assert(get_type(['1.0', '0.0']) == "numeric")
assert(get_type([0, 1, 2]) == "numeric")
assert(get_type(0.100) == "numeric")