diff --git a/code/memanalyzer.py b/code/memanalyzer.py
index 2d849cc1..ddd6a788 100644
--- a/code/memanalyzer.py
+++ b/code/memanalyzer.py
@@ -56,7 +56,7 @@ def file_size(file):
 
 
 def analyse_memory(elf_file):
-    command = "%s -t '%s'" % (objdump_binary, elf_file)
+    command = "{} -t '{}'".format(objdump_binary, elf_file)
     response = subprocess.check_output(shlex.split(command))
     if isinstance(response, bytes):
         response = response.decode('utf-8')
@@ -67,8 +67,8 @@ def analyse_memory(elf_file):
     ret = {}
 
     for (id_, _) in list(sections.items()):
-        section_start_token = " _%s_start" % id_
-        section_end_token = " _%s_end" % id_
+        section_start_token = " _{}_start".format(id_)
+        section_end_token = " _{}_end".format(id_)
         section_start = -1
         section_end = -1
         for line in lines:
@@ -93,9 +93,9 @@ def analyse_memory(elf_file):
         # print("{0: >10}|{1: >30}|{2:12X}|{3:12X}|{4:8}".format(id_, descr, section_start, section_end, section_length))
         # i += 1
 
-    # print("Total Used RAM : %d" % usedRAM)
-    # print("Free RAM : %d" % (TOTAL_DRAM - usedRAM))
-    # print("Free IRam : %d" % usedIRAM)
+    # print("Total Used RAM : {:d}".format(usedRAM))
+    # print("Free RAM : {:d}".format(TOTAL_DRAM - usedRAM))
+    # print("Free IRam : {:d}".format(usedIRAM))
     return ret
 
 
@@ -103,7 +103,7 @@ def run(env_, modules_):
     flags = ""
     for item in modules_.items():
         flags += "-D%s_SUPPORT=%d " % item
-    command = "ESPURNA_BOARD=\"WEMOS_D1_MINI_RELAYSHIELD\" ESPURNA_FLAGS=\"%s\" platformio run --silent --environment %s 2>/dev/null" % (flags, env_)
+    command = "ESPURNA_BOARD=\"WEMOS_D1_MINI_RELAYSHIELD\" ESPURNA_FLAGS=\"{}\" platformio run --silent --environment {} 2>/dev/null".format(flags, env_)
     subprocess.check_call(command, shell=True)
 
 
@@ -164,7 +164,7 @@ if __name__ == '__main__':
     # Check test modules exist
     for module in test_modules:
         if module not in available_modules:
-            print("Module %s not found" % module)
+            print("Module {} not found".format(module))
             sys.exit(2)
 
     # Define base configuration
@@ -177,9 +177,9 @@ if __name__ == '__main__':
 
     # Show init message
     if len(test_modules) > 0:
-        print("Analyzing module(s) %s on top of %s configuration\n" % (", ".join(test_modules), "CORE" if args.core > 0 else "DEFAULT"))
+        print("Analyzing module(s) {} on top of {} configuration\n".format(", ".join(test_modules), "CORE" if args.core > 0 else "DEFAULT"))
     else:
-        print("Analyzing %s configuration\n" % ("CORE" if args.core > 0 else "DEFAULT"))
+        print("Analyzing {} configuration\n".format("CORE" if args.core > 0 else "DEFAULT"))
 
     output_format = "{:<20}|{:<15}|{:<15}|{:<15}|{:<15}|{:<15}|{:<15}|{:<15}"
     print(output_format.format(
@@ -215,8 +215,8 @@ if __name__ == '__main__':
 
     # Build the core without modules to get base memory usage
     run(env, modules)
-    base = analyse_memory(".pioenvs/%s/firmware.elf" % env)
-    base['size'] = file_size(".pioenvs/%s/firmware.bin" % env)
+    base = analyse_memory(".pioenvs/{}/firmware.elf".format(env))
+    base['size'] = file_size(".pioenvs/{}/firmware.bin".format(env))
     calc_free(base)
     print(output_format.format(
             "CORE" if args.core == 1 else "DEFAULT",
@@ -235,8 +235,8 @@ if __name__ == '__main__':
 
         modules[module] = 1
         run(env, modules)
-        results[module] = analyse_memory(".pioenvs/%s/firmware.elf" % env)
-        results[module]['size'] = file_size(".pioenvs/%s/firmware.bin" % env)
+        results[module] = analyse_memory(".pioenvs/{}/firmware.elf".format(env))
+        results[module]['size'] = file_size(".pioenvs/{}/firmware.bin".format(env))
         calc_free(results[module])
         modules[module] = 0
 
@@ -257,8 +257,8 @@ if __name__ == '__main__':
         for module in test_modules:
             modules[module] = 1
         run(env, modules)
-        total = analyse_memory(".pioenvs/%s/firmware.elf" % env)
-        total['size'] = file_size(".pioenvs/%s/firmware.bin" % env)
+        total = analyse_memory(".pioenvs/{}/firmware.elf".format(env))
+        total['size'] = file_size(".pioenvs/{}/firmware.bin".format(env))
         calc_free(total)
 
         if len(test_modules) > 1: