diff --git a/src/yunohost/app.py b/src/yunohost/app.py
index 1d4a2ab30..a48400a8e 100644
--- a/src/yunohost/app.py
+++ b/src/yunohost/app.py
@@ -520,7 +520,7 @@ def app_upgrade(app=[], url=None, file=None, force=False):
     apps = app
     # Check if disk space available
     if free_space_in_directory("/") <= 512 * 1000 * 1000:
-	    raise YunohostValidationError("disk_space_not_sufficient_update")
+        raise YunohostValidationError("disk_space_not_sufficient_update")
     # If no app is specified, upgrade all apps
     if not apps:
         # FIXME : not sure what's supposed to happen if there is a url and a file but no apps...
diff --git a/src/yunohost/domain.py b/src/yunohost/domain.py
index e5f3a0133..279943a9f 100644
--- a/src/yunohost/domain.py
+++ b/src/yunohost/domain.py
@@ -116,7 +116,7 @@ def domain_add(operation_logger, domain, dyndns=False):
     domain = domain.lower()
 
     # Non-latin characters (e.g. café.com => xn--caf-dma.com)
-    domain = domain.encode('idna').decode('utf-8')
+    domain = domain.encode("idna").decode("utf-8")
 
     # DynDNS domain
     if dyndns:
diff --git a/src/yunohost/hook.py b/src/yunohost/hook.py
index 05e706660..33f5885e2 100644
--- a/src/yunohost/hook.py
+++ b/src/yunohost/hook.py
@@ -320,7 +320,13 @@ def hook_callback(
 
 
 def hook_exec(
-    path, args=None, raise_on_error=False, chdir=None, env=None, user="root", return_format="json"
+    path,
+    args=None,
+    raise_on_error=False,
+    chdir=None,
+    env=None,
+    user="root",
+    return_format="json",
 ):
     """
     Execute hook from a file with arguments
@@ -419,9 +425,9 @@ def _hook_exec_bash(path, args, chdir, env, user, return_format, loggers):
 
     # Construct command to execute
     if user == "root":
-        command = ['sh', '-c']
+        command = ["sh", "-c"]
     else:
-        command = ['sudo', '-n', '-u', user, '-H', 'sh', '-c']
+        command = ["sudo", "-n", "-u", user, "-H", "sh", "-c"]
 
     # use xtrace on fd 7 which is redirected to stdout
     env["BASH_XTRACEFD"] = "7"