#27364: fix "incorrect" uses of escape character in the stdlib.

And most of the tools.

Patch by Emanual Barry, reviewed by me, Serhiy Storchaka, and
Martin Panter.

Tools/scripts/fixdiv.py

@@ -174,8 +174,8 @@ def usage(msg):
     sys.stderr.write("Usage: %s [-m] warnings\n" % sys.argv[0])
     sys.stderr.write("Try `%s -h' for more information.\n" % sys.argv[0])
 
-PATTERN = ("^(.+?):(\d+): DeprecationWarning: "
-           "classic (int|long|float|complex) division$")
+PATTERN = (r"^(.+?):(\d+): DeprecationWarning: "
+           r"classic (int|long|float|complex) division$")
 
 def readwarnings(warningsfile):
     prog = re.compile(PATTERN)

Tools/scripts/h2py.py

@@ -23,13 +23,13 @@
 
 import sys, re, getopt, os
 
-p_define = re.compile('^[\t ]*#[\t ]*define[\t ]+([a-zA-Z0-9_]+)[\t ]+')
+p_define = re.compile(r'^[\t ]*#[\t ]*define[\t ]+([a-zA-Z0-9_]+)[\t ]+')
 
 p_macro = re.compile(
-  '^[\t ]*#[\t ]*define[\t ]+'
-  '([a-zA-Z0-9_]+)\(([_a-zA-Z][_a-zA-Z0-9]*)\)[\t ]+')
+  r'^[\t ]*#[\t ]*define[\t ]+'
+  r'([a-zA-Z0-9_]+)\(([_a-zA-Z][_a-zA-Z0-9]*)\)[\t ]+')
 
-p_include = re.compile('^[\t ]*#[\t ]*include[\t ]+<([^>\n]+)>')
+p_include = re.compile(r'^[\t ]*#[\t ]*include[\t ]+<([^>\n]+)>')
 
 p_comment = re.compile(r'/\*([^*]+|\*+[^/])*(\*+/)?')
 p_cpp_comment = re.compile('//.*')

Tools/scripts/highlight.py

@@ -147,14 +147,14 @@ def build_html_page(classified_text, title='python',
 #### LaTeX Output ##########################################
 
 default_latex_commands = {
-    'comment': '{\color{red}#1}',
-    'string': '{\color{ForestGreen}#1}',
-    'docstring': '{\emph{\color{ForestGreen}#1}}',
-    'keyword': '{\color{orange}#1}',
-    'builtin': '{\color{purple}#1}',
-    'definition': '{\color{orange}#1}',
-    'defname': '{\color{blue}#1}',
-    'operator': '{\color{brown}#1}',
+    'comment': r'{\color{red}#1}',
+    'string': r'{\color{ForestGreen}#1}',
+    'docstring': r'{\emph{\color{ForestGreen}#1}}',
+    'keyword': r'{\color{orange}#1}',
+    'builtin': r'{\color{purple}#1}',
+    'definition': r'{\color{orange}#1}',
+    'defname': r'{\color{blue}#1}',
+    'operator': r'{\color{brown}#1}',
 }
 
 default_latex_document = r'''

Tools/scripts/mailerdaemon.py

@@ -88,7 +88,7 @@ del i
 # no more expressions are searched for.  So, order is important.
 emparse_list_reason = [
     r'^5\d{2} <>\.\.\. (?P<reason>.*)',
-    '<>\.\.\. (?P<reason>.*)',
+    r'<>\.\.\. (?P<reason>.*)',
     re.compile(r'^<<< 5\d{2} (?P<reason>.*)', re.MULTILINE),
     re.compile('===== stderr was =====\nrmail: (?P<reason>.*)'),
     re.compile('^Diagnostic-Code: (?P<reason>.*)', re.MULTILINE),

Tools/scripts/parseentities.py

@@ -14,7 +14,7 @@
 """
 import re,sys
 
-entityRE = re.compile('<!ENTITY +(\w+) +CDATA +"([^"]+)" +-- +((?:.|\n)+?) *-->')
+entityRE = re.compile(r'<!ENTITY +(\w+) +CDATA +"([^"]+)" +-- +((?:.|\n)+?) *-->')
 
 def parse(text,pos=0,endpos=None):
 
@@ -39,7 +39,7 @@ def writefile(f,defs):
         if charcode[:2] == '&#':
             code = int(charcode[2:-1])
             if code < 256:
-                charcode = "'\%o'" % code
+                charcode = r"'\%o'" % code
             else:
                 charcode = repr(charcode)
         else:

Tools/scripts/pathfix.py

@@ -64,7 +64,7 @@ def main():
             if fix(arg): bad = 1
     sys.exit(bad)
 
-ispythonprog = re.compile('^[a-zA-Z0-9_]+\.py$')
+ispythonprog = re.compile(r'^[a-zA-Z0-9_]+\.py$')
 def ispython(name):
     return bool(ispythonprog.match(name))
 

Tools/scripts/ptags.py

@@ -24,7 +24,7 @@ def main():
         for s in tags: fp.write(s)
 
 
-expr = '^[ \t]*(def|class)[ \t]+([a-zA-Z0-9_]+)[ \t]*[:\(]'
+expr = r'^[ \t]*(def|class)[ \t]+([a-zA-Z0-9_]+)[ \t]*[:\(]'
 matcher = re.compile(expr)
 
 def treat_file(filename):

Tools/scripts/svneol.py

@@ -1,6 +1,6 @@
 #! /usr/bin/env python3
 
-"""
+r"""
 SVN helper script.
 
 Try to set the svn:eol-style property to "native" on every .py, .txt, .c and

Tools/scripts/texi2html.py

@@ -78,11 +78,11 @@ spprog = re.compile('[\n@{}&<>]')                 # Special characters in
                                                   # running text
                                                   #
                                                   # menu item (Yuck!)
-miprog = re.compile('^\* ([^:]*):(:|[ \t]*([^\t,\n.]+)([^ \t\n]*))[ \t\n]*')
-#                   0    1     1 2        3          34         42        0
-#                         -----            ----------  ---------
-#                                 -|-----------------------------
-#                    -----------------------------------------------------
+miprog = re.compile(r'^\* ([^:]*):(:|[ \t]*([^\t,\n.]+)([^ \t\n]*))[ \t\n]*')
+#                    0    1     1 2        3          34         42        0
+#                          -----            ----------  ---------
+#                                  -|-----------------------------
+#                     -----------------------------------------------------