I'm using Ubuntu 14.04 x64, I've followed the Scrapy docs to install the package using pip:
pip install scrapy
Then I followed the initialization of the example project and try to execute the example spider:
scrapy crawl example
and I get this error:
2015-02-23 10:23:42+0100 [scrapy] INFO: Scrapy 0.14.4 started (bot: example)
2015-02-23 10:23:42+0100 [scrapy] DEBUG: Enabled extensions: LogStats, TelnetConsole, CloseSpider, WebService, CoreStats, MemoryUsage, SpiderState
Traceback (most recent call last):
  File "/usr/local/bin/scrapy", line 11, in <module>
    sys.exit(execute())
  File "/usr/lib/python2.7/dist-packages/scrapy/cmdline.py", line 132, in execute
    _run_print_help(parser, _run_command, cmd, args, opts)
  File "/usr/lib/python2.7/dist-packages/scrapy/cmdline.py", line 97, in _run_print_help
    func(*a, **kw)
  File "/usr/lib/python2.7/dist-packages/scrapy/cmdline.py", line 139, in _run_command
    cmd.run(args, opts)
  File "/usr/lib/python2.7/dist-packages/scrapy/commands/crawl.py", line 43, in run
    spider = self.crawler.spiders.create(spname, **opts.spargs)
  File "/usr/lib/python2.7/dist-packages/scrapy/command.py", line 34, in crawler
    self._crawler.configure()
  File "/usr/lib/python2.7/dist-packages/scrapy/crawler.py", line 36, in configure
    self.spiders = spman_cls.from_crawler(self)
  File "/usr/lib/python2.7/dist-packages/scrapy/spidermanager.py", line 37, in from_crawler
    return cls.from_settings(crawler.settings)
  File "/usr/lib/python2.7/dist-packages/scrapy/spidermanager.py", line 33, in from_settings
    return cls(settings.getlist('SPIDER_MODULES'))
  File "/usr/lib/python2.7/dist-packages/scrapy/spidermanager.py", line 23, in __init__
    for module in walk_modules(name):
  File "/usr/lib/python2.7/dist-packages/scrapy/utils/misc.py", line 65, in walk_modules
    submod = __import__(fullpath, {}, {}, [''])
  File "/home/alvaro/vagrantenvs/example/example/spiders/example_spider.py", line 3, in <module>
    class ExampleSpider(scrapy.Spider):
AttributeError: 'module' object has no attribute 'Spider'
I checked with pip freeze | grep 'Scrapy' to check the installed version of Scrapy and I got:
Scrapy==0.24.4
but as you can see in the traceback error:
2015-02-23 10:23:42+0100 [scrapy] INFO: Scrapy 0.14.4 started (bot: example)
- I tried to uninstall and reinstall
 - I tried also to update pip, uninstall scrapy and reinstall
 - I tried to install it using apt-get
 
- Why If I installed the latest version (0.24.4) it seems it's executing 0.14.4 ?
 - Is this issue related with Scrapy, Pip or both ?
 
Edit:
Here it is the file example_spider.py:
import scrapy
class ExampleSpider(scrapy.Spider):
    name = "example"
    allowed_domains = ["dmoz.org"]
    start_urls = [
        "http://www.dmoz.org/Computers/Programming/Languages/Python/Books/",
        "http://www.dmoz.org/Computers/Programming/Languages/Python/Resources/"
    ]
    def parse(self, response):
        filename = response.url.split("/")[-2]
        with open(filename, 'wb') as f:
            f.write(response.body)
If I execute scrapy version as @aberna sugested I got:
Scrapy 0.14.4