Fix style and code issues in bin2carray python script

stm-firmware/updater/ram-code/bin2carray.py

@@ -1,35 +1,45 @@
 #!env python
 
-# Convert a file to a c array
-# bin2carray <output file> <input file>
+"""
+Convert a file to a c array
+bin2carray <output file> <input file>
+"""
 
 import os
 import os.path
 import sys
 
-if len(sys.argv) < 3:
-	sys.exit(-1)
+def main():
+    """
+    Main script function
+    """
+    if len(sys.argv) < 3:
+        return -1
 
-source_file = sys.argv[2]
-dest_file = sys.argv[1]
+    source_file = sys.argv[2]
+    dest_file = sys.argv[1]
 
-print("%s --> %s" % (source_file, dest_file))
+    print(f'{source_file} --> {dest_file}')
 
-with open(source_file, "rb") as src:
+    with open(source_file, 'rb') as src:
         data = src.read()
 
-with open(dest_file, "w") as dest:
-	header_guard = "__" + os.path.basename(dest_file).replace('.', '_').replace('-', '_') + "_H__"
-	dest.write("#ifndef %s\n" % (header_guard))
-	dest.write("#define %s\n" % (header_guard))
-	dest.write("static const char binary_blob[%d] = {\n" % (len(data)))
-	for current,idx in zip(data, range(len(data))):
-		if ((idx+1) % 4 == 0):
-			dest.write(hex(current)+",\n")
+    with open(dest_file, 'w', encoding='utf-8') as dest:
+        header_guard = '_' + os.path.basename(dest_file).replace('.', '_').replace('-', '_') + '_H_'
+        header_guard = header_guard.upper()
+        dest.write(f'#ifndef {header_guard}\n')
+        dest.write(f'#define {header_guard}\n')
+        dest.write(f'static const char binary_blob[{len(data)}] = {{\n')
+        for idx, current in enumerate(data, start=1):
+            if idx % 4 == 0:
+                dest.write(hex(current)+',\n')
             else:
-			dest.write(hex(current)+",")
+                dest.write(hex(current)+',')
 
-	dest.write("};\n")
-	dest.write("#endif /* %s */\n" % (header_guard))
+        dest.write('};\n')
+        dest.write(f'#endif /* {header_guard} */\n')
 
-sys.exit(0)
+    return 0
+
+if __name__ == '__main__':
+    sys.exit(main())