Python Update open File Open mode

Per https://docs.python.org/3.7/library/functions.html#open, the `+` is for `open a disk file for updating (reading and writing)`. Per the example, if we're looking to just read/write, the `+` isn't necessary.

python.html.markdown

@@ -492,19 +492,19 @@ with open("myfile.txt") as f:
 
 # Writing to a file
 contents = {"aa": 12, "bb": 21}
-with open("myfile1.txt", "w+") as file:
+with open("myfile1.txt", "w") as file:
     file.write(str(contents))        # writes a string to a file
 
-with open("myfile2.txt", "w+") as file:
+with open("myfile2.txt", "w") as file:
     file.write(json.dumps(contents)) # writes an object to a file
 
 # Reading from a file
-with open('myfile1.txt', "r+") as file:
+with open('myfile1.txt', "r") as file:
     contents = file.read()           # reads a string from a file
 print(contents)
 # print: {"aa": 12, "bb": 21}
 
-with open('myfile2.txt', "r+") as file:
+with open('myfile2.txt', "r") as file:
     contents = json.load(file)       # reads a json object from a file
 print(contents)
 # print: {"aa": 12, "bb": 21}