diff --git a/scripts/code.py b/scripts/code.py
index 3d430c50..6c405f23 100755
--- a/scripts/code.py
+++ b/scripts/code.py
@@ -892,10 +892,10 @@ def read_csv(path, Result, *,
 
     with openio(path, 'r') as f:
         # csv or json? assume json starts with [
-        json = (f.buffer.peek(1)[:1] == b'[')
+        is_json = (f.buffer.peek(1)[:1] == b'[')
 
         # read csv?
-        if not json:
+        if not is_json:
             results = []
             reader = csv.DictReader(f, restval='')
             for r in reader:
diff --git a/scripts/cov.py b/scripts/cov.py
index 75b44d04..b6c0a140 100755
--- a/scripts/cov.py
+++ b/scripts/cov.py
@@ -747,10 +747,10 @@ def read_csv(path, Result, *,
 
     with openio(path, 'r') as f:
         # csv or json? assume json starts with [
-        json = (f.buffer.peek(1)[:1] == b'[')
+        is_json = (f.buffer.peek(1)[:1] == b'[')
 
         # read csv?
-        if not json:
+        if not is_json:
             results = []
             reader = csv.DictReader(f, restval='')
             for r in reader:
diff --git a/scripts/csv.py b/scripts/csv.py
index ddf4d3b0..59746f5b 100755
--- a/scripts/csv.py
+++ b/scripts/csv.py
@@ -1350,10 +1350,10 @@ def collect_csv(csv_paths, *,
         try:
             with openio(path) as f:
                 # csv or json? assume json starts with [
-                json = (f.buffer.peek(1)[:1] == b'[')
+                is_json = (f.buffer.peek(1)[:1] == b'[')
 
                 # read csv?
-                if not json:
+                if not is_json:
                     reader = csv.DictReader(f, restval='')
                     # collect fields
                     fields.update((k, True) for k in reader.fieldnames or [])
diff --git a/scripts/ctx.py b/scripts/ctx.py
index 1dbbea2f..34437770 100755
--- a/scripts/ctx.py
+++ b/scripts/ctx.py
@@ -1152,10 +1152,10 @@ def read_csv(path, Result, *,
 
     with openio(path, 'r') as f:
         # csv or json? assume json starts with [
-        json = (f.buffer.peek(1)[:1] == b'[')
+        is_json = (f.buffer.peek(1)[:1] == b'[')
 
         # read csv?
-        if not json:
+        if not is_json:
             results = []
             reader = csv.DictReader(f, restval='')
             for r in reader:
diff --git a/scripts/data.py b/scripts/data.py
index bd91f0e3..bc6ed733 100755
--- a/scripts/data.py
+++ b/scripts/data.py
@@ -892,10 +892,10 @@ def read_csv(path, Result, *,
 
     with openio(path, 'r') as f:
         # csv or json? assume json starts with [
-        json = (f.buffer.peek(1)[:1] == b'[')
+        is_json = (f.buffer.peek(1)[:1] == b'[')
 
         # read csv?
-        if not json:
+        if not is_json:
             results = []
             reader = csv.DictReader(f, restval='')
             for r in reader:
diff --git a/scripts/perf.py b/scripts/perf.py
index cbc8f54f..c83c7748 100755
--- a/scripts/perf.py
+++ b/scripts/perf.py
@@ -1253,10 +1253,10 @@ def read_csv(path, Result, *,
 
     with openio(path, 'r') as f:
         # csv or json? assume json starts with [
-        json = (f.buffer.peek(1)[:1] == b'[')
+        is_json = (f.buffer.peek(1)[:1] == b'[')
 
         # read csv?
-        if not json:
+        if not is_json:
             results = []
             reader = csv.DictReader(f, restval='')
             for r in reader:
diff --git a/scripts/perfbd.py b/scripts/perfbd.py
index 4311876c..8b99d4a7 100755
--- a/scripts/perfbd.py
+++ b/scripts/perfbd.py
@@ -1227,10 +1227,10 @@ def read_csv(path, Result, *,
 
     with openio(path, 'r') as f:
         # csv or json? assume json starts with [
-        json = (f.buffer.peek(1)[:1] == b'[')
+        is_json = (f.buffer.peek(1)[:1] == b'[')
 
         # read csv?
-        if not json:
+        if not is_json:
             results = []
             reader = csv.DictReader(f, restval='')
             for r in reader:
diff --git a/scripts/stack.py b/scripts/stack.py
index ac7c3d64..ef7843ae 100755
--- a/scripts/stack.py
+++ b/scripts/stack.py
@@ -895,10 +895,10 @@ def read_csv(path, Result, *,
 
     with openio(path, 'r') as f:
         # csv or json? assume json starts with [
-        json = (f.buffer.peek(1)[:1] == b'[')
+        is_json = (f.buffer.peek(1)[:1] == b'[')
 
         # read csv?
-        if not json:
+        if not is_json:
             results = []
             reader = csv.DictReader(f, restval='')
             for r in reader:
diff --git a/scripts/structs.py b/scripts/structs.py
index 3eb6462c..a302ea91 100755
--- a/scripts/structs.py
+++ b/scripts/structs.py
@@ -1033,10 +1033,10 @@ def read_csv(path, Result, *,
 
     with openio(path, 'r') as f:
         # csv or json? assume json starts with [
-        json = (f.buffer.peek(1)[:1] == b'[')
+        is_json = (f.buffer.peek(1)[:1] == b'[')
 
         # read csv?
-        if not json:
+        if not is_json:
             results = []
             reader = csv.DictReader(f, restval='')
             for r in reader: