如何自动检测冒号是否属于范畴?

我想找一个熊猫专栏的分类。我可以得到类型，但我很难找出类别。

titanic_df = pd.read_csv('http://biostat.mc.vanderbilt.edu/wiki/pub/Main/DataSets/titanic3.csv')

#ID datatype

def idDataTypes(inputDataFrame):
    columnTypesDict = {} 
    import numpy as np
    import numbers
    import pandas as pd
    from pandas.api.types import is_string_dtype
    from pandas.api.types import is_numeric_dtype

    for columns in inputDataFrame.columns.values:
        #print(columns)
        #try to convert to number. If it doesn't work it will convert to another type
        try:
            inputDataFrame[columns] = pd.to_numeric(inputDataFrame[columns], errors='ignore').apply(lambda x: x + 1 if isinstance(x, numbers.Number) else x) 
        except:
            print(columns, " cannot convert.")
        #print(inputDataFrame[columns].dtype)

        #create dictionary with the label
        if is_numeric_dtype(inputDataFrame[columns]): #products[columns].dtype == np.float64:
            columnTypesDict[columns] = "numeric"
        elif is_string_dtype(inputDataFrame[columns]): # products[columns].dtype == np.object:
            columnTypesDict[columns] = "string"
            #print(is_string_dtype(products[columns]))
        else:
            print("something else", prinputDataFrameoducts[columns].dtype)

    #category 
    cols = inputDataFrame.columns
    num_cols = inputDataFrame._get_numeric_data().columns
    #num_cols
    proposedCategory = list(set(cols) - set(num_cols))
    for value in proposedCategory:
        columnTypesDict[value] = "category"

    return(columnTypesDict)

idDataTypes(titanic_df)

我得到的结果不是我想要的:

{'pclass': 'numeric',
 'survived': 'numeric',
 'name': 'category',
 'sex': 'category',
 'age': 'numeric',
 'sibsp': 'numeric',
 'parch': 'numeric',
 'ticket': 'category',
 'fare': 'numeric',
 'cabin': 'category',
 'embarked': 'category',
 'boat': 'category',
 'body': 'numeric',
 'home.dest': 'category'}

pclass应该是一个类别，而名称不应该是。 我不知道如何评估某物是否是一个类别。什么好主意吗? 问题来源StackOverflow 地址：/questions/59384802/how-can-i-automatically-detect-if-a-colum-is-categorical