simplejson json AttributeError: "module" object has no attribute "dump"

I am new at programming and I have a question regarding the following error. I am using python 2.7., and I have the following script to create a simple graph (example taken from python CrashCourse by Eric Matthes):

    import matplotlib.pyplot as plt


    squares = [1,4,9,16,25]
    plt.plot(squares, linewitdth = 5)

    #Set chart title and lable axes.
    plt.title("Square Numbers", fontsize = 24)
    plt.xlabel("Value", fontsize = 14)
    plt.ylabel("Square of Value", fontsize = 14)

    # Set size of tick labels
    plt.tick_params(axis = "both", labelsize = 14)

    plt.show()

When I ran this script in WindowsPowerShell I got the following error:

Traceback (most recent call last): File "mpl_squares.py", line 1, in <module> 
import matplotlib.pyplot as plt
File "C:\Users\Roger\Anaconda2\lib\sitepackages\matplotlib\__init__.py, line 134, in <module> from ._version import get_versions
File "C:\Users\Roger\Anaconda2\lib\site-packages\matplotlib\_version.py", line 7, in <module> import json
File "C:\Users\Roger\Desktop\lpthw\json.py", line 7, in <module>
AttributeError: "module" object has no attribute "dump"

In other script I had the same problem when importing this module, then I found a solution by replacing the line "import json" by "import simplejson, and It worked well.

Here is the solution I found back then:

json is simplejson, added to the stdlib. But since json was added in 2.6, simplejson has the advantage of working on more Python versions (2.4+).

simplejson is also updated more frequently than Python, so if you need (or want) the latest version, it's best to use simplejson itself, if possible.

A good practice, in my opinion, is to use one or the other as a fallback.

try: import simplejson as json except ImportError: import json

Now I checkt in the error I got the module it is poiting out "_version.py" This is the information contained in this file:

   # This file was generated by 'versioneer.py' (0.15) from
   # revision-control system data, or from the parent directory name of an
   # unpacked source archive. Distribution tarballs contain a pre-generated 
   #copy
   # of this file.

   import json
   import sys

   version_json = '''
    {
     "dirty": false,
     "error": null,
     "full-revisionid": "26382a72ea234ee0efd40543c8ae4a30cffc4f0d",
     "version": "1.5.3"
    }
    '''  # END VERSION_JSON


   def get_versions():
        return json.loads(version_json)

Question: Do you think I would have to fix something in the _version.py module by replacing import json for import simplejson and the function added in the module?

I am thinking in a workaround to fix the problem but I don't wanna modify anything from the _version.py if it make things worse. Thank you very much for your comments and suggestions.

Best Regards