[英]How to create a list of instances of a given class
我的代码遇到问题。 事实上,我需要创建我的类(专利)的实例列表。 该列表的名称是patent_ints。 但是当我试图验证该列表中的任何元素是否是专利元素时,我总是得到一个错误的响应。 当迭代第一个元素时,就像"<__main__.Patent at 0x7f107820b710>"
。 这是我的代码,我需要帮助!
import json
import datetime
patent_data = json.loads(open('NASA_data.json', "r").read())
unique_center = []
for thing in patent_data["Patent_Information"]["Results"]:
for val in thing:
if(val == 'NASA Center'):
unique_center.append(thing[val])
total_num_centers = len(set(unique_center))
class Patent:
def __init__(self, abbreviated_organization_name, dict_data):
self.org_name = abbreviated_organization_name
self.title = dict_data["Title"]
# initialize instance variable called year. The value can be extracted from dict_data.
# This should be a four digit string.
self.year = str(datetime.datetime.strptime(dict_data['Date'], '%m/%d/%Y').year) #dict_data['Date'].split('/')[2]
# initialize an instance variable called month. The value can be extracted from dict_data.
# This should be a two digit string.
self.month = str(datetime.datetime.strptime(dict_data['Date'], '%m/%d/%Y').month) #dict_data['Date'].split('/')[0]
# initialize an instance variable called day. The value can be extracted from dict_data.
# This should be a two digit string.
self.day = str(datetime.datetime.strptime(dict_data['Date'], '%m/%d/%Y').day) #dict_data['Date'].split('/')[1]
self.id = dict_data['Case Number']
self.access_limit = dict_data['SRA Final']
patent_ints = [Patent(i, data) for i in unique_center for data in patent_data["Patent_Information"]["Results"]]
patent_ints[0]
先感谢您!
<__main__.Patent at 0x7f107820b710>
是您尝试打印 class 时的默认表示。 将__str__
或__repr__
方法添加到 class 并定义一些自定义逻辑以将所需的详细信息作为字符串返回:
class Patent:
def __init__(self, abbreviated_organization_name, dict_data):
...
def __repr__(self):
# return a dictionary of items in the class but you can return whatever you want
# you could do f'{self.title} {self.id} {self.year}-{self.month}-{self.day}' but str(self.__dict__) is quick to test
return str(self.__dict__)
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