fix some of the issues reported by codacity

tools/build-addon-index.py

@@ -27,11 +27,11 @@
 import sexpr
 
 
-def escape_str(str):
-    return "\"%s\"" % str.replace("\"", "\\\"")
+def escape_str(string):
+    return "\"%s\"" % string.replace("\"", "\\\"")
 
 
-class Addon:
+class Addon(object):
     def __init__(self, filename):
         lst = sexpr.parse(filename)
         if lst[0][0] != "supertux-addoninfo":

tools/font-add-border.py

@@ -25,7 +25,7 @@ def fix_font_file(filename, glyph_width, glyph_height):
     print("Processing %s %dx%d" % (filename, glyph_width, glyph_height))
     img = Image.open(filename)
     w, h = img.size
-    
+
     assert w % glyph_width == 0, "image not multiple of glyph width"
     assert h % glyph_height == 0, "image not multiple of glyph height"
 

tools/font-generator.py

@@ -24,7 +24,7 @@
 import math
 import re
 
-class FontGenerator:
+class FontGenerator(object):
 
     def __init__(self):
         self.font_size = 24

tools/levelconverter-0.0.6_0.0.7.py

@@ -23,17 +23,17 @@
    ['d', "cloud-00.png",  90],
    ['e', "cloud-00.png",  91],
    ['f', "cloud-00.png",  92],
-   
+
    ['G', "bkgd-00.png",   93],
    ['H', "bkgd-01.png",   94],
    ['I', "bkgd-02.png",   95],
    ['J', "bkgd-03.png",   96],
-   
+
    ['g', "bkgd-10.png",   97],
    ['h', "bkgd-11.png",   98],
    ['i', "bkgd-12.png",   99],
    ['j', "bkgd-13.png",  100],
-   
+
    ['#', "solid0.png",    11],
    ['[', "solid1.png",    13],
    ['=', "solid2.png",    14],

tools/upload_supertux_wiki.sh

@@ -66,9 +66,9 @@ fi
 # MD5SUM=`md5sum "$1" | cut -c "1-32"`
 # echo "MD5Sum: $MD5SUM"
 
-STEP1_FILE="`tempfile`"
-STEP2_FILE="`tempfile`"
-COOKIES_FILE="`tempfile`"
+STEP1_FILE="$(tempfile)"
+STEP2_FILE="$(tempfile)"
+COOKIES_FILE="$(tempfile)"
 
 curl \
 	-c "$COOKIES_FILE" \