使用pip3安装BeautifulSoup失败

Question

我试图将BeatifulSoup添加到我的python项目中，但在输入pip3 install BeautifulSoup后，它返回，

Collecting BeautifulSoup
  Downloading BeatifulSoup-3.2.1.tar.gz
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 20, in <module>
      File "/private/var/folders/27/cw_r5rjs6rg5vqnqmvbjs9n00000gn/T/pip-build-tddl0x3f/BeautifulSoup/setup.py", line 22
        print "Unit tests have failed!"
                                  ^
    SyntaxError: Missing parentheses in call to 'print'
    ---------------------------------------------


Command "python setup.py egg_info" failed with error code 1 in 
/private/var/folders/27/cw_r5rjs6rg5vqnqmvbjs9n00000gn/T/pip-build-tddl0x3f/BeautifulSoup
You are using pip version 7.1.2, however version 8.1.2 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.

但是当我尝试pip3 install --upgrade pip3时，它会返回

Could not find a version that satisfies the requirement pip3 (from versions)
No matching distribution found for pip3

我知道在执行setup.py文件时与python2和python3发生冲突，但我不知道如何解决这个问题才能正确运行所以请帮助我。