title: Trying to install numpy 1.7
body: <p>I am currently using Python 2.7 and Numpy 1.6.2. I want to use the <a href="http://docs.scipy.org/doc/numpy/reference/generated/numpy.polynomial.polynomial.polyfit.html" rel="nofollow"><code>numpy.polyfit()</code></a> function with the weights parameter. However, it seems that the weights parameter is not available in numpy 1.6.2. The Sourceforge <a href="http://sourceforge.net/projects/numpy/files/NumPy/" rel="nofollow">download link</a> shows 1.6.2 as being the latest version. I have found the updated <a href="https://github.com/numpy/numpy/blob/master/numpy/lib/polynomial.py#L394" rel="nofollow"><code>polynomial.py</code></a> file which includes the weights parameter for the <code>polyfit()</code> function. I simply replaced my current <code>polynomial.py</code> with the updated one on the website. However, when I try to run my Python program, I get the error:</p>
  
  <pre><code>Traceback (most recent call last):
    File "C:\Python27\first.py", line 13, in &lt;module&gt;
      import matplotlib
    File "C:\Python27\lib\site-packages\matplotlib\__init__.py", line 133, in &lt;module&gt;
      from matplotlib.rcsetup import (defaultParams,
    File "C:\Python27\lib\site-packages\matplotlib\rcsetup.py", line 19, in &lt;module&gt;
      from matplotlib.colors import is_color_like
    File "C:\Python27\lib\site-packages\matplotlib\colors.py", line 52, in &lt;module&gt;
      import numpy as np
    File "C:\Python27\lib\site-packages\numpy\__init__.py", line 153, in &lt;module&gt;
      import polynomial
    File "C:\Python27\lib\site-packages\numpy\polynomial\__init__.py", line 18, in &lt;module&gt;
      from polynomial import Polynomial
  ImportError: cannot import name Polynomial
  </code></pre>
  
  <p><code>first.py</code> is simply the file with all my code I'm trying to run</p>
  
  <p>What am I doing wrong? Is there another way to simply get the newest version of Numpy (1.7?) ?</p>
  
  <p>Thank you for your help!</p>