使用matplot做图--sin图像

# _*_ coding:utf-8 _*_
import numpy as np
import matplotlib.pyplot as plt

x = np.arange(-5, 5, 0.1)
y = np.sin(x)
plt.plot(x, y)
plt.show()

这里插入一个可能会碰到的问题：

I am trying to import matplotlib like so:

import matplotlib.pyplot as plt
For this I have installed matplotlib using.

python -m pip install -U pip setuptools
python -m pip install matplotlib
Although the basic_example.py from the examples worked, it suddenly stopped running along with all other files with matplotlib giving me the below error:

File "matplotlib.py", line 2, in <module>
  import matplotlib.pyplot as plt # pyplot module.
ImportError: No module named pyplot`
I tried to check if the module is still there, and it seems to be. What could be possibly wrong?

Requirement already satisfied: matplotlib in c:\python27\lib\site-packages
Requirement already satisfied: numpy>=1.6 in c:\python27\lib\site-packages (from matplotlib)
Requirement already satisfied: python-dateutil in c:\python27\lib\site-packages (from matplotlib)
Requirement already satisfied: cycler in c:\python27\lib\site-packages (from matplotlib)
Requirement already satisfied: pyparsing!=2.0.4,!=2.1.2,>=1.5.6 in c:\python27\lib\site-packages (from matplotlib)
Requirement already satisfied: pytz in c:\python27\lib\site-packages (from matplotlib)
Requirement already satisfied: six>=1.5 in c:\python27\lib\site-packages (from python-dateuti

简单的说就是，安装了模块，但是出现模块导入错误。

看看回答：

Python 2.7 tries to find modules in the current working directory first, before
 going into the installed packages, so because you named your test file "matplotlib.py", 
it will interpret it as the matplotlib package. Rename your test file to something else, and it should be fine

是的，检查一下你的文件名是不是跟导入的模块名重复了。。。。