python：错误：[<__ main __。class实例位于0x>]

Question

I wanna scrabble the APP's name on the app's website of Apple store and print it out on the terminal.

Here is my code:

from lxml import html
import requests

class AppCrawler:
    def __init__(self,starting_url,depth):
        self.starting_url = starting_url
        self.depth = depth
        self.apps = []

    def crawl(self):
        self.get_app_from_link(self.starting_url)

    def get_app_from_link(self,link):
        start_page = requests.get(link)
        tree = html.fromstring(start_page.text)

        name =  tree.xpath('//h1[@itemprop="name"]/text()')[0]
        app = App(name)
        self.apps.append(app)

class App:
    def __init__(self,name):
        self.name=name
    def __str__(self):
        return ("Name:" + self.name)

crawler = AppCrawler('https://itunes.apple.com/us/app/candy-crush-saga/id553834731',0)
crawler.crawl()
################ print the list ##################################
print crawler.apps
################ print the element in the list ###################
for app in crawler.apps:
    print app

Here is what I get in the terminal:

[<__main__.App instance at 0x029C3EE0>]
AppName:Candy Crush Saga

My question is:

why the list print is [< main .App instance at 0x029C3EE0>] and use the " for in " loop to print the element in the list is exactly right??

Answer 1

try:

for app in crawler.apps:
    print str(app)

or implement

__repr__ instead of __str__