diff --git a/tools/github_issues_to_csv b/tools/github_issues_to_csv
index c287f7c..ce6e1e2 100644
--- a/tools/github_issues_to_csv
+++ b/tools/github_issues_to_csv
@@ -8,10 +8,11 @@
 import argparse
 import csv
 import getpass
+
 import requests
 
 auth = None
-states = 'all'
+states = "all"
 
 
 def write_issues(response, csv_out):
@@ -22,36 +23,45 @@
     if response.status_code != 200:
         raise Exception(response.status_code)
     for issue in response.json():
-        if 'pull_request' not in issue:
-            labels = ', '.join([lable['name'] for lable in issue['labels']])
+        if "pull_request" not in issue:
+            labels = ", ".join([lable["name"] for lable in issue["labels"]])
 
             # Below lines to overcome "TypeError: 'NoneType' object has
             # no attribute '__getitem__'"
 
-            close_date = issue.get('closed_at')
+            close_date = issue.get("closed_at")
             if close_date:
-                close_date = issue.get('closed_at').split('T')[0]
+                close_date = issue.get("closed_at").split("T")[0]
 
-            assignee_resp = issue.get('assignees', 'Not Assigned')
+            assignee_resp = issue.get("assignees", "Not Assigned")
             if assignee_resp:
-                owners = ','.join([assignee_login['login'] for
-                                   assignee_login in assignee_resp])
+                owners = ",".join(
+                    [
+                        assignee_login["login"]
+                        for assignee_login in assignee_resp
+                    ]
+                )
             else:
                 owners = "Not Assigned"
 
-            milestone_resp = issue.get('milestone', 'Not Assigned')
+            milestone_resp = issue.get("milestone", "Not Assigned")
             if milestone_resp:
-                milestone_resp = milestone_resp['title'].encode('utf-8')
+                milestone_resp = milestone_resp["title"].encode("utf-8")
 
             # Change the following line to write out additional fields
-            csv_out.writerow([labels.encode('utf-8'),
-                              issue.get('title').encode('utf-8'),
-                              issue.get('state').encode('utf-8'),
-                              issue.get('created_at').split('T')[0],
-                              close_date,
-                              issue.get('html_url').encode('utf-8'),
-                              issue.get('user').get('login').encode('utf-8'),
-                              owners, milestone_resp])
+            csv_out.writerow(
+                [
+                    labels.encode("utf-8"),
+                    issue.get("title").encode("utf-8"),
+                    issue.get("state").encode("utf-8"),
+                    issue.get("created_at").split("T")[0],
+                    close_date,
+                    issue.get("html_url").encode("utf-8"),
+                    issue.get("user").get("login").encode("utf-8"),
+                    owners,
+                    milestone_resp,
+                ]
+            )
 
 
 def get_issues_from_github_to_csv(name, response):
@@ -65,36 +75,49 @@
     print(states)
 
     # Multiple requests are required if response is paged
-    if 'link' in response.headers:
-        pages = {rel[6:-1]: url[url.index('<') + 1:-1] for url, rel in
-                 (link.split(';') for link in
-                  response.headers['link'].split(','))}
-        while 'last' in pages and 'next' in pages:
-            pages = {rel[6:-1]: url[url.index('<') + 1:-1] for url, rel in
-                     (link.split(';') for link in
-                      response.headers['link'].split(','))}
-            response = requests.get(pages['next'], auth=auth)
+    if "link" in response.headers:
+        pages = {
+            rel[6:-1]: url[url.index("<") + 1 : -1]
+            for url, rel in (
+                link.split(";") for link in response.headers["link"].split(",")
+            )
+        }
+        while "last" in pages and "next" in pages:
+            pages = {
+                rel[6:-1]: url[url.index("<") + 1 : -1]
+                for url, rel in (
+                    link.split(";")
+                    for link in response.headers["link"].split(",")
+                )
+            }
+            response = requests.get(pages["next"], auth=auth)
             write_issues(response, csv_out)
-            if pages['next'] == pages['last']:
+            if pages["next"] == pages["last"]:
                 break
 
 
-parser = argparse.ArgumentParser(description="Write GitHub repository issues "
-                                             "to CSV file.")
+parser = argparse.ArgumentParser(
+    description="Write GitHub repository issues to CSV file."
+)
 
-parser.add_argument('username', nargs='?', help="GitHub user name, "
-                    "formatted as 'username'")
+parser.add_argument(
+    "username", nargs="?", help="GitHub user name, formatted as 'username'"
+)
 
-parser.add_argument('repositories', nargs='+', help="Repository names, "
-                    "formatted as 'basereponame/repo'")
+parser.add_argument(
+    "repositories",
+    nargs="+",
+    help="Repository names, formatted as 'basereponame/repo'",
+)
 
-parser.add_argument('--all', action='store_true', help="Returns both open "
-                    "and closed issues.")
+parser.add_argument(
+    "--all", action="store_true", help="Returns both open and closed issues."
+)
 
 args = parser.parse_args()
 
 if args.all:
-    state = 'all'
+    state = "all"
 
 username = args.username
 
@@ -105,16 +128,26 @@
 # To set the csv filename
 csvfilename = ""
 for repository in args.repositories:
-    csvfilename_temp = '{}'.format(repository.replace('/', '-'))
+    csvfilename_temp = "{}".format(repository.replace("/", "-"))
     csvfilename = csvfilename + csvfilename_temp
-csvfilename = csvfilename + '-issues.csv'
-with open(csvfilename, 'w') as csvfileout:
+csvfilename = csvfilename + "-issues.csv"
+with open(csvfilename, "w") as csvfileout:
     csv_out = csv.writer(csvfileout)
-    csv_out.writerow(['Labels', 'Title', 'State', 'Open Date',
-                      'Close Date', 'URL', 'Author', 'Assignees',
-                      'Milestone'])
+    csv_out.writerow(
+        [
+            "Labels",
+            "Title",
+            "State",
+            "Open Date",
+            "Close Date",
+            "URL",
+            "Author",
+            "Assignees",
+            "Milestone",
+        ]
+    )
     for repository in args.repositories:
-        l_url = 'https://api.github.com/repos/{}/issues?state={}'
+        l_url = "https://api.github.com/repos/{}/issues?state={}"
         l_url = l_url.format(repository, states)
         response = requests.get(l_url, auth=auth)
         write_issues(response, csv_out)