PyCharm不能導入BeautifulSoup

我試圖讓使用Python的BS4蜘蛛，我已經使用或者PIP和easy_install的已安裝BS4，但一旦我運行使用PyCharm程序，它提供了一個錯誤：PyCharm不能導入BeautifulSoup

Traceback (most recent call last): 
    File "C:/PyCharm Project/bs4.py", line 3, in <module> 
    from bs4 import BeautifulSoup 
    File "C:\PyCharm Project\bs4.py", line 3, in <module> 
    from bs4 import BeautifulSoup 
ImportError: cannot import name 'BeautifulSoup' 

Process finished with exit code 1

但在命令提示符這個錯誤不會出現：

C:\WINDOWS\system32>python 
Python 3.5.0 (v3.5.0:374f501f4567, Sep 13 2015, 02:16:59) [MSC v.1900 32 bit (Intel)] on win32 
Type "help", "copyright", "credits" or "license" for more information. 
>>> from bs4 import BeautifulSoup 
>>> 
>>> html_doc = """ 
... <html><head><title>The Dormouse's story</title></head> 
... <body> 
... <p class="title"><b>The Dormouse's story</b></p> 
... 
... <p class="story">Once upon a time there were three little sisters; and their names were 
... <a href="http://example.com/elsie" class="sister" id="link1">Elsie</a>, 
... <a href="http://example.com/lacie" class="sister" id="link2">Lacie</a> and 
... <a href="http://example.com/tillie" class="sister" id="link3">Tillie</a>; 
... and they lived at the bottom of a well.</p> 
... 
... <p class="story">...</p> 
... """ 
>>> 
>>> # create a bs object using a HTML page 
... soup = BeautifulSoup(html_doc, 'html.parser', from_encoding='utf-8') 
>>> soup.title 
<title>The Dormouse's story</title> 
>>> soup.title.string 
"The Dormouse's story" 
>>>

項目解釋：