diff --git a/docs/build_docs.py b/docs/build_docs.py
index 0fa376ecdb..1c36615ffa 100755
--- a/docs/build_docs.py
+++ b/docs/build_docs.py
@@ -142,7 +142,7 @@ def parallel_call(args, callback):
         for ret, entry in zip(errcodes, entries):
             if ret != 0:
                 print("language: %s, target: %s, errcode: %d" % (entry[0], entry[1], ret))
-        #Don't re-throw real error code from each parallel process
+        # Don't re-throw real error code from each parallel process
         return 1
     else:
         return 0
@@ -197,7 +197,7 @@ def sphinx_call(language, target, build_dir, sphinx_parallel_jobs, buildername):
     except KeyboardInterrupt:  # this seems to be the only way to get Ctrl-C to kill everything?
         p.kill()
         os.chdir(saved_cwd)
-        return 130 #FIXME It doesn't return this errorcode, why? Just prints stacktrace
+        return 130  # FIXME It doesn't return this errorcode, why? Just prints stacktrace
     os.chdir(saved_cwd)
     return ret
 
@@ -315,7 +315,8 @@ def call_linkcheck(entry):
 GH_LINK_RE = r"https://github.com/espressif/esp-idf/(?:tree|blob|raw)/[^\s]+"
 
 # we allow this one link, because we always want users to see the latest support policy
-GH_LINK_ALLOWED = [ "https://github.com/espressif/esp-idf/blob/master/SUPPORT_POLICY.md" ]
+GH_LINK_ALLOWED = ["https://github.com/espressif/esp-idf/blob/master/SUPPORT_POLICY.md"]
+
 
 def action_gh_linkcheck(args):
     print("Checking for hardcoded GitHub links\n")
@@ -326,12 +327,12 @@ def action_gh_linkcheck(args):
     for root, _, files in os.walk(docs_dir):
         if "_build" in root:
             continue
-        files = [ os.path.join(root, f) for f in files if f.endswith(".rst") ]
+        files = [os.path.join(root, f) for f in files if f.endswith(".rst")]
         for path in files:
             with open(path, "r") as f:
-                 for link in re.findall(GH_LINK_RE, f.read()):
-                     if link not in GH_LINK_ALLOWED:
-                         github_links.append((path, link))
+                for link in re.findall(GH_LINK_RE, f.read()):
+                    if link not in GH_LINK_ALLOWED:
+                        github_links.append((path, link))
 
     if github_links:
         for path, link in github_links:
diff --git a/docs/conf_common.py b/docs/conf_common.py
index 2e3c60cf14..36fd57dc30 100644
--- a/docs/conf_common.py
+++ b/docs/conf_common.py
@@ -160,6 +160,7 @@ def update_exclude_patterns(tags):
                   'api-reference/peripherals/temp_sensor.rst']:
             exclude_patterns.append(e)
 
+
 # The reST default role (used for this markup: `text`) to use for all
 # documents.
 # default_role = None
@@ -370,9 +371,9 @@ def setup(app):
     app.config.breathe_projects = {"esp32-idf": os.path.join(app.config.build_dir, "xml_in/")}
     app.config.breathe_default_project = "esp32-idf"
 
-
     setup_diag_font(app)
 
+
 def setup_diag_font(app):
     # blockdiag and other tools require a font which supports their character set
     # the font file is stored on the download server to save repo size
diff --git a/docs/idf_extensions/format_idf_target.py b/docs/idf_extensions/format_idf_target.py
index 65c33222bf..da342841f5 100644
--- a/docs/idf_extensions/format_idf_target.py
+++ b/docs/idf_extensions/format_idf_target.py
@@ -5,10 +5,10 @@ TOOLCHAIN_NAMES = {'esp32': 'esp', 'esp32s2': 'esp32s2'}
 CONFIG_PREFIX = {'esp32': 'ESP32', 'esp32s2': 'ESP32S2'}
 
 TRM_EN_URL = {'esp32': 'https://www.espressif.com/sites/default/files/documentation/esp32_technical_reference_manual_en.pdf',
-           'esp32s2': 'https://www.espressif.com/sites/default/files/documentation/esp32-s2_technical_reference_manual_en.pdf'}
+              'esp32s2': 'https://www.espressif.com/sites/default/files/documentation/esp32-s2_technical_reference_manual_en.pdf'}
 
 TRM_CN_URL = {'esp32': 'https://www.espressif.com/sites/default/files/documentation/esp32_technical_reference_manual_cn.pdf',
-           'esp32s2': 'https://www.espressif.com/sites/default/files/documentation/esp32-s2_technical_reference_manual_cn.pdf'}
+              'esp32s2': 'https://www.espressif.com/sites/default/files/documentation/esp32-s2_technical_reference_manual_cn.pdf'}
 
 
 class StringSubstituter:
diff --git a/docs/idf_extensions/gen_idf_tools_links.py b/docs/idf_extensions/gen_idf_tools_links.py
index abba61daa5..4a02b81260 100644
--- a/docs/idf_extensions/gen_idf_tools_links.py
+++ b/docs/idf_extensions/gen_idf_tools_links.py
@@ -3,6 +3,7 @@ from __future__ import print_function
 import os.path
 from util import copy_if_modified, call_with_python
 
+
 def setup(app):
     # we don't actually need idf-info, just a convenient event to trigger this on
     app.connect('idf-info', generate_idf_tools_links)
diff --git a/docs/zh_CN/conf.py b/docs/zh_CN/conf.py
index 70e377de10..dd4b2cd8c8 100644
--- a/docs/zh_CN/conf.py
+++ b/docs/zh_CN/conf.py
@@ -10,7 +10,6 @@ import sys
 import os
 sys.path.insert(0, os.path.abspath('..'))
 from conf_common import *  # noqa: F401, F403 - need to make available everything from common
-from idf_extensions.util import download_file_if_missing  # noqa: E402 - need to import from common folder
 
 # General information about the project.
 project = u'ESP-IDF 编程指南'