diff --git a/rrd_convert.py b/rrd_convert.py
index cbeaffc..fcd166d 100755
--- a/rrd_convert.py
+++ b/rrd_convert.py
@@ -123,14 +123,14 @@ def rrd_convert(src_filename, dst_filename, arch_dest):
             write_header(arch_dest, ds_cnt, rra_cnt, pdp_step)
 
             ### __rrd_read(rrd->ds_def, ds_def_t, rrd->stat_head->ds_cnt);
-            for ds in range(0, ds_cnt):
+            for ds in range(ds_cnt):
                 fd.write(fs.read(40))
-                for i in range(0, 10):
+                for _ in range(10):
                     double_read_write_swap_nan()
 
             row_cnt = 0
             ### __rrd_read(rrd->rra_def, rra_def_t, rrd->stat_head->rra_cnt);
-            for rra in range(0, rra_cnt):
+            for _ in range(rra_cnt):
                 fd.write(fs.read(20))
                 if arch_dest == 'x86_64':
                     fd.write(b'\x00\x00\x00\x00')  # Padding
@@ -142,7 +142,7 @@ def rrd_convert(src_filename, dst_filename, arch_dest):
                     fs.read(4)  # Padding
                 if arch_dest == 'armv6l':
                     fd.write(b'\x00\x00\x00\x00')  # Padding
-                for i in range(0, 10):
+                for _ in range(10):
                     double_read_write_swap_nan()
             long_rw_func()
             long_rw_func()
@@ -151,16 +151,16 @@ def rrd_convert(src_filename, dst_filename, arch_dest):
             fd.write(fs.read(112 * ds_cnt))
 
             ### __rrd_read(rrd->cdp_prep, cdp_prep_t, rrd->stat_head->rra_cnt * rrd->stat_head->ds_cnt);
-            for i in range(0, 10 * ds_cnt * rra_cnt):
+            for _ in range(10 * ds_cnt * rra_cnt):
                 double_read_write_swap_nan()
 
             ### __rrd_read(rrd->rra_ptr, rra_ptr_t, rrd->stat_head->rra_cnt);
-            for rra in range(0, rra_cnt):
+            for rra in range(rra_cnt):
                 long_rw_func()
             length_header_dst = fd.tell()
 
             ###  __rrd_read(rrd->rrd_value, rrd_value_t, row_cnt * rrd->stat_head->ds_cnt);
-            for i in range(0, row_cnt * ds_cnt):
+            for i in range(row_cnt * ds_cnt):
                 double_read_write_swap_nan()
 
             assert(fd.tell() == length_header_dst + 8 * row_cnt * ds_cnt)
diff --git a/rrdinfo-parser.py b/rrdinfo-parser.py
index dda06a2..fed5a1d 100755
--- a/rrdinfo-parser.py
+++ b/rrdinfo-parser.py
@@ -80,7 +80,7 @@ def _parse_ds(self):
                 m = re.search(ds_re, line)
                 if m:
                     data_source, field, value = m.groups(0)
-                    if not data_source in ds_dict:
+                    if data_source not in ds_dict:
                         ds_dict[data_source] = {}
 
                     ds_dict[data_source][field] = value.strip('"').strip()
@@ -102,7 +102,7 @@ def _parse_rra(self):
                 m = re.search(rra_re, line)
                 if m:
                     rra, field, value = m.groups(0)
-                    if not rra in rra_dict:
+                    if rra not in rra_dict:
                         rra_dict[rra] = {}
 
                     rra_dict[rra][field] = value.strip('"').strip()
@@ -131,10 +131,7 @@ def parse(self):
 
         for key, value in ds.items():
             for item in ['max', 'min']:
-                if value[item] == 'NaN':
-                    value[item] = 'U'
-                else:
-                    value[item] = float(value[item])
+                value[item] = 'U' if value[item] == 'NaN' else float(value[item])
             ds_str = '             DS:%s:' % key
             ds_str += '%s:%s:%s:%s \\' % (
                 value['type'], value['minimal_heartbeat'],
@@ -171,10 +168,7 @@ def main():
                       help="Existing rrdfile to parse")
 
     (options, args) = parser.parse_args()
-    params = {}
-    params['debug'] = options.debug
-    params['file'] = options.file
-
+    params = {'debug': options.debug, 'file': options.file}
     rrd_parser = RRDParser(params)
     rrd_parser.parse()