#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.

cmd.py

@@ -221,7 +221,7 @@ class Command:
         self._ensure_stringlike(option, "string", default)
 
     def ensure_string_list(self, option):
-        """Ensure that 'option' is a list of strings.  If 'option' is
+        r"""Ensure that 'option' is a list of strings.  If 'option' is
         currently a string, we split it either on /,\s*/ or /\s+/, so
         "foo bar baz", "foo,bar,baz", and "foo,   bar baz" all become
         ["foo", "bar", "baz"].

command/bdist_msi.py

@@ -623,7 +623,7 @@ class bdist_msi(Command):
         cost = PyDialog(db, "DiskCostDlg", x, y, w, h, modal, title,
                         "OK", "OK", "OK", bitmap=False)
         cost.text("Title", 15, 6, 200, 15, 0x30003,
-                  "{\DlgFontBold8}Disk Space Requirements")
+                 r"{\DlgFontBold8}Disk Space Requirements")
         cost.text("Description", 20, 20, 280, 20, 0x30003,
                   "The disk space required for the installation of the selected features.")
         cost.text("Text", 20, 53, 330, 60, 3,
@@ -670,7 +670,7 @@ class bdist_msi(Command):
         progress = PyDialog(db, "ProgressDlg", x, y, w, h, modeless, title,
                             "Cancel", "Cancel", "Cancel", bitmap=False)
         progress.text("Title", 20, 15, 200, 15, 0x30003,
-                      "{\DlgFontBold8}[Progress1] [ProductName]")
+                     r"{\DlgFontBold8}[Progress1] [ProductName]")
         progress.text("Text", 35, 65, 300, 30, 3,
                       "Please wait while the Installer [Progress2] [ProductName]. "
                       "This may take several minutes.")

command/build_scripts.py

@@ -51,7 +51,7 @@ class build_scripts(Command):
 
 
     def copy_scripts(self):
-        """Copy each script listed in 'self.scripts'; if it's marked as a
+        r"""Copy each script listed in 'self.scripts'; if it's marked as a
         Python script in the Unix way (first line matches 'first_line_re',
         ie. starts with "\#!" and contains "python"), then adjust the first
         line to refer to the current Python interpreter as we copy.

cygwinccompiler.py

@@ -368,7 +368,7 @@ def check_config_h():
         return (CONFIG_H_UNCERTAIN,
                 "couldn't read '%s': %s" % (fn, exc.strerror))
 
-RE_VERSION = re.compile(b'(\d+\.\d+(\.\d+)*)')
+RE_VERSION = re.compile(br'(\d+\.\d+(\.\d+)*)')
 
 def _find_exe_version(cmd):
     """Find the version of an executable by running `cmd` in the shell.

msvc9compiler.py

@@ -716,7 +716,7 @@ class MSVCCompiler(CCompiler) :
                 r"""VC\d{2}\.CRT("|').*?(/>|</assemblyIdentity>)""",
                 re.DOTALL)
             manifest_buf = re.sub(pattern, "", manifest_buf)
-            pattern = "<dependentAssembly>\s*</dependentAssembly>"
+            pattern = r"<dependentAssembly>\s*</dependentAssembly>"
             manifest_buf = re.sub(pattern, "", manifest_buf)
             # Now see if any other assemblies are referenced - if not, we
             # don't want a manifest embedded.

sysconfig.py

@@ -278,7 +278,7 @@ def parse_config_h(fp, g=None):
 
 # Regexes needed for parsing Makefile (and similar syntaxes,
 # like old-style Setup files).
-_variable_rx = re.compile("([a-zA-Z][a-zA-Z0-9_]+)\s*=\s*(.*)")
+_variable_rx = re.compile(r"([a-zA-Z][a-zA-Z0-9_]+)\s*=\s*(.*)")
 _findvar1_rx = re.compile(r"\$\(([A-Za-z][A-Za-z0-9_]*)\)")
 _findvar2_rx = re.compile(r"\${([A-Za-z][A-Za-z0-9_]*)}")
 

versionpredicate.py

@@ -154,7 +154,7 @@ def split_provision(value):
     global _provision_rx
     if _provision_rx is None:
         _provision_rx = re.compile(
-            "([a-zA-Z_]\w*(?:\.[a-zA-Z_]\w*)*)(?:\s*\(\s*([^)\s]+)\s*\))?$",
+            r"([a-zA-Z_]\w*(?:\.[a-zA-Z_]\w*)*)(?:\s*\(\s*([^)\s]+)\s*\))?$",
             re.ASCII)
     value = value.strip()
     m = _provision_rx.match(value)