diff --git a/res/lang.py b/res/lang.py
index 74492818a..2ed549fe1 100644
--- a/res/lang.py
+++ b/res/lang.py
@@ -5,20 +5,22 @@ import glob
 import sys
 import csv
 
+
 def get_lang(lang):
-  out = {}
-  for ln in open('./src/lang/%s.rs'%lang, encoding='utf8'):
-    ln = ln.strip()
-    if ln.startswith('("'):
-      k, v = line_split(ln)
-      out[k] = v
-  return out
+    out = {}
+    for ln in open('./src/lang/%s.rs' % lang, encoding='utf8'):
+        ln = ln.strip()
+        if ln.startswith('("'):
+            k, v = line_split(ln)
+            out[k] = v
+    return out
+
 
 def line_split(line):
     toks = line.split('", "')
     if len(toks) != 2:
         print(line)
-        assert(0)
+        assert (0)
     # Replace fixed position.
     # Because toks[1] may be v") or v"),
     k = toks[0][toks[0].find('"') + 1:]
@@ -27,62 +29,62 @@ def line_split(line):
 
 
 def main():
-  if len(sys.argv) == 1:
-    expand()
-  elif sys.argv[1] == '1':
-    to_csv()
-  else:
-    to_rs(sys.argv[1])
+    if len(sys.argv) == 1:
+        expand()
+    elif sys.argv[1] == '1':
+        to_csv()
+    else:
+        to_rs(sys.argv[1])
 
 
 def expand():
-  for fn in glob.glob('./src/lang/*.rs'):
-    lang = os.path.basename(fn)[:-3]
-    if lang in ['en','template']: continue
-    print(lang)
-    dict = get_lang(lang)
-    fw = open("./src/lang/%s.rs"%lang, "wt", encoding='utf8')
-    for line in open('./src/lang/template.rs', encoding='utf8'):
-      line_strip = line.strip()
-      if line_strip.startswith('("'):
-        k, v = line_split(line_strip)
-        if k in dict:
-          # embraced with " to avoid empty v
-          line = line.replace('"%s"'%v, '"%s"'%dict[k])
-        else:
-          line = line.replace(v, "")
-        fw.write(line)
-      else:
-        fw.write(line)
-    fw.close()
+    for fn in glob.glob('./src/lang/*.rs'):
+        lang = os.path.basename(fn)[:-3]
+        if lang in ['en', 'template']: continue
+        print(lang)
+        dict = get_lang(lang)
+        fw = open("./src/lang/%s.rs" % lang, "wt", encoding='utf8')
+        for line in open('./src/lang/template.rs', encoding='utf8'):
+            line_strip = line.strip()
+            if line_strip.startswith('("'):
+                k, v = line_split(line_strip)
+                if k in dict:
+                    # embraced with " to avoid empty v
+                    line = line.replace('"%s"' % v, '"%s"' % dict[k])
+                else:
+                    line = line.replace(v, "")
+                fw.write(line)
+            else:
+                fw.write(line)
+        fw.close()
 
 
 def to_csv():
-  for fn in glob.glob('./src/lang/*.rs'):
-    lang = os.path.basename(fn)[:-3]
-    csvfile = open('./src/lang/%s.csv'%lang, "wt", encoding='utf8')
-    csvwriter = csv.writer(csvfile)
-    for line in open(fn, encoding='utf8'):
-      line_strip = line.strip()
-      if line_strip.startswith('("'):
-        k, v = line_split(line_strip)
-        csvwriter.writerow([k, v])
-    csvfile.close()
+    for fn in glob.glob('./src/lang/*.rs'):
+        lang = os.path.basename(fn)[:-3]
+        csvfile = open('./src/lang/%s.csv' % lang, "wt", encoding='utf8')
+        csvwriter = csv.writer(csvfile)
+        for line in open(fn, encoding='utf8'):
+            line_strip = line.strip()
+            if line_strip.startswith('("'):
+                k, v = line_split(line_strip)
+                csvwriter.writerow([k, v])
+        csvfile.close()
 
 
 def to_rs(lang):
-  csvfile = open('%s.csv'%lang, "rt", encoding='utf8')
-  fw = open("./src/lang/%s.rs"%lang, "wt", encoding='utf8')
-  fw.write('''lazy_static::lazy_static! {
+    csvfile = open('%s.csv' % lang, "rt", encoding='utf8')
+    fw = open("./src/lang/%s.rs" % lang, "wt", encoding='utf8')
+    fw.write('''lazy_static::lazy_static! {
 pub static ref T: std::collections::HashMap<&'static str, &'static str> =
     [
 ''')
-  for row in csv.reader(csvfile):
-    fw.write('        ("%s", "%s"),\n'%(row[0].replace('"', '\"'), row[1].replace('"', '\"')))
-  fw.write('''    ].iter().cloned().collect();
+    for row in csv.reader(csvfile):
+        fw.write('        ("%s", "%s"),\n' % (row[0].replace('"', '\"'), row[1].replace('"', '\"')))
+    fw.write('''    ].iter().cloned().collect();
 }
 ''')
-  fw.close()
+    fw.close()
 
 
 main()