DOCSP-42254: Fix GridFS code (#99)

* DOCSP-42254: Fix GridFS code

* edit wording

* fixes

* reword

* dedent

* RR feedback

(cherry picked from commit 7e64c10)

Author: norareidy

source/includes/gridfs/gridfs.py

@@ -1,41 +1,39 @@
 # start create bucket
-const db = client.db(dbName);
-const bucket = new mongodb.GridFSBucket(db);
+client = MongoClient("<connection string>")
+db = client["db"]
+bucket = gridfs.GridFSBucket(db)
 # end create bucket
 
 # start create custom bucket
-const bucket = new mongodb.GridFSBucket(db, { bucketName: 'myCustomBucket' });
+custom_bucket = gridfs.GridFSBucket(db, bucket_name="myCustomBucket")
 # end create custom bucket
 
 # start upload files
-   fs.createReadStream('./myFile').
-        pipe(bucket.openUploadStream('myFile', {
-            chunkSizeBytes: 1048576,
-            metadata: { field: 'myField', value: 'myValue' }
-        }));
+with bucket.open_upload_stream(
+    "my_file", chunk_size_bytes=1048576, metadata={"contentType": "text/plain"}
+) as grid_in:
+    grid_in.write("data to store")
 # end upload files
 
 # start retrieve file info
-   const cursor = bucket.find({});
-   for await (const doc of cursor) {
-      console.log(doc);
-   }
+for file_doc in bucket.find({}):
+    print(file_doc)
 # end retrieve file info
 
 # start download files name
-   bucket.openDownloadStreamByName('myFile').
-        pipe(fs.createWriteStream('./outputFile'));
+file = bucket.open_download_stream_by_name("my_file")
+contents = file.read()
 # end download files name
 
 # start download files id
-   bucket.openDownloadStream(ObjectId("60edece5e06275bf0463aaf3")).
-        pipe(fs.createWriteStream('./outputFile'));
+file = bucket.open_download_stream(ObjectId("66b3c86e672a17b6c8a4a4a9"))
+contents = file.read()
 # end download files id
 
 # start rename files
-   bucket.rename(ObjectId("60edece5e06275bf0463aaf3"), "newFileName");
+bucket.rename(ObjectId("66b3c86e672a17b6c8a4a4a9"), "new_file_name")
 # end rename files
 
 # start delete files
-   bucket.delete(ObjectId("60edece5e06275bf0463aaf3"));
-# end delete files
+bucket.delete(ObjectId("66b3c86e672a17b6c8a4a4a9"))
+# end delete files

source/write/gridfs.txt

@@ -83,7 +83,7 @@ call read and write operations on the files in your bucket.
 
 .. literalinclude:: /includes/gridfs/gridfs.py
       :language: python
-      :copyable: true
+      :dedent:
       :start-after: start create bucket
       :end-before: end create bucket
 
@@ -95,7 +95,7 @@ constructor, as shown below:
 
 .. literalinclude:: /includes/gridfs/gridfs.py
       :language: python
-      :copyable: true
+      :dedent:
       :start-after: start create custom bucket
       :end-before: end create custom bucket
 
@@ -104,16 +104,16 @@ constructor, as shown below:
 Upload Files
 ------------
 
-Use the ``open_upload_stream()`` method from the ``GridFSBucket`` class to create an upload
-stream for a given file name. The
-``open_upload_stream()`` method allows you to specify configuration information
-such as file chunk size and other field/value pairs to store as metadata. Set
-these options as parameters of ``open_upload_stream()``, as shown in the
-following code example:
+Use the ``open_upload_stream()`` method from the ``GridFSBucket`` class to
+create an upload stream for a given file name. The ``open_upload_stream()``
+method allows you to specify configuration information such as file chunk
+size and other field/value pairs to store as metadata. Set these options
+as parameters of ``open_upload_stream()``, as shown in the following code
+example:
 
 .. literalinclude:: /includes/gridfs/gridfs.py
       :language: python
-      :copyable: true
+      :dedent:
       :start-after: start upload files
       :end-before: end upload files
 
@@ -138,12 +138,12 @@ from which you can access the results. To learn more about ``Cursor`` objects in
 {+driver-short+}, see :ref:`<pymongo-cursors>`.
 
 The following code example shows you how to retrieve and print file metadata
-from all your files in a GridFS bucket. It uses the ``for...of`` syntax to traverse the
+from all your files in a GridFS bucket. It uses the ``for...in`` syntax to traverse the
 ``Cursor`` iterable and display the results:
 
 .. literalinclude:: /includes/gridfs/gridfs.py
       :language: python
-      :copyable: true
+      :dedent:
       :start-after: start retrieve file info
       :end-before: end retrieve file info
 
@@ -162,12 +162,11 @@ You can download files from your MongoDB database by using the
 download stream.
 
 The following example shows you how to download a file referenced
-by the file name, stored in the ``filename`` field, into your working
-directory:
+by the file name, ``"my_file"``, and read its contents:
 
 .. literalinclude:: /includes/gridfs/gridfs.py
       :language: python
-      :copyable: true
+      :dedent:
       :start-after: start download files name 
       :end-before: end download files name
 
@@ -182,7 +181,7 @@ method, which takes the ``_id`` field of a file as a parameter:
 
 .. literalinclude:: /includes/gridfs/gridfs.py
       :language: python
-      :copyable: true
+      :dedent:
       :start-after: start download files id
       :end-before: end download files id
 
@@ -204,11 +203,11 @@ bucket. You must specify the file to rename by its ``_id`` field
 rather than its file name.
 
 The following example shows how to update the ``filename`` field to
-``"newFileName"`` by referencing a document's ``_id`` field:
+``"new_file_name"`` by referencing a document's ``_id`` field:
 
 .. literalinclude:: /includes/gridfs/gridfs.py
       :language: python
-      :copyable: true
+      :dedent:
       :start-after: start rename files
       :end-before: end rename files
 
@@ -233,7 +232,7 @@ The following example shows you how to delete a file by referencing its ``_id``
 
 .. literalinclude:: /includes/gridfs/gridfs.py
       :language: python
-      :copyable: true
+      :dedent:
       :start-after: start delete files
       :end-before: end delete files