Improve *.py code quality

Also fixes some latent, rather unimportant bugs

auth.py

-import hmac, hashlib
+import hmac
+import hashlib
 import ssl
 from datetime import datetime
 
 
 class User:
     def __init__(self, username, groups, timestamp=None, obsolete=False,
-            permanent=False):
+                 permanent=False):
         self.username = username
         self.groups = groups
         if timestamp is not None:
@@ -16,8 +17,9 @@ class User:
         self.permanent = permanent
 
     def summarize(self):
-        return "{}:{}:{}:{}:{}".format(self.username, ",".join(self.groups),
-            str(self.timestamp.timestamp()), self.obsolete, self.permanent)
+        return ":".join((
+            self.username, ",".join(self.groups),
+            str(self.timestamp.timestamp()), self.obsolete, self.permanent))
 
     @staticmethod
     def from_summary(summary):
@@ -45,7 +47,8 @@ class UserManager:
         for backend in self.backends:
             if backend.authenticate(username, password):
                 groups = sorted(list(set(backend.groups(username, password))))
-                return User(username, groups, obsolete=backend.obsolete,
+                return User(
+                    username, groups, obsolete=backend.obsolete,
                     permanent=permanent)
         return None
 
@@ -77,8 +80,8 @@ class SecurityManager:
         if user is None:
             return False
         session_duration = datetime.now() - user.timestamp
-        macs_equal = hmac.compare_digest(maccer.hexdigest().encode("utf-8"),
-            hash)
+        macs_equal = hmac.compare_digest(
+            maccer.hexdigest().encode("utf-8"), hash)
         time_short = int(session_duration.total_seconds()) < self.max_duration
         return macs_equal and (time_short or user.permanent)
 
@@ -97,23 +100,22 @@ class StaticUserManager:
 
     def authenticate(self, username, password):
         return (username in self.passwords
-            and self.passwords[username] == password)
+                and self.passwords[username] == password)
 
     def groups(self, username, password=None):
         if username in self.group_map:
             yield from self.group_map[username]
 
     def all_groups(self):
-        yield from list(set(group for group in groups.values()))
+        yield from list(set(group for group in self.group_map.values()))
 
 
 try:
     import ldap3
-    from ldap3.utils.dn import parse_dn
 
     class LdapManager:
         def __init__(self, host, user_dn, group_dn, port=636, use_ssl=True,
-                obsolete=False):
+                     obsolete=False):
             self.server = ldap3.Server(host, port=port, use_ssl=use_ssl)
             self.user_dn = user_dn
             self.group_dn = group_dn
@@ -121,8 +123,8 @@ try:
 
         def authenticate(self, username, password):
             try:
-                connection = ldap3.Connection(self.server,
-                    self.user_dn.format(username), password)
+                connection = ldap3.Connection(
+                    self.server, self.user_dn.format(username), password)
                 return connection.bind()
             except ldap3.core.exceptions.LDAPSocketOpenError:
                 return False
@@ -144,16 +146,15 @@ try:
             for group in group_reader.search():
                 yield group.cn.value
 
-
     class ADManager:
         def __init__(self, host, domain, user_dn, group_dn,
-            port=636, use_ssl=True, ca_cert=None, obsolete=False):
+                     port=636, use_ssl=True, ca_cert=None, obsolete=False):
             tls_config = ldap3.Tls(validate=ssl.CERT_REQUIRED)
             if ca_cert is not None:
-                tls_config = ldap3.Tls(validate=ssl.CERT_REQUIRED,
-                    ca_certs_file=ca_cert)
-            self.server = ldap3.Server(host, port=port, use_ssl=use_ssl,
-                tls=tls_config)
+                tls_config = ldap3.Tls(
+                    validate=ssl.CERT_REQUIRED, ca_certs_file=ca_cert)
+            self.server = ldap3.Server(
+                host, port=port, use_ssl=use_ssl, tls=tls_config)
             self.domain = domain
             self.user_dn = user_dn
             self.group_dn = group_dn
@@ -176,11 +177,13 @@ try:
             connection.bind()
             obj_def = ldap3.ObjectDef("user", connection)
             name_filter = "cn:={}".format(username)
-            user_reader = ldap3.Reader(connection, obj_def, self.user_dn,
-                name_filter)
+            user_reader = ldap3.Reader(
+                connection, obj_def, self.user_dn, name_filter)
             group_def = ldap3.ObjectDef("group", connection)
+
             def _yield_recursive_groups(group_dn):
-                group_reader = ldap3.Reader(connection, group_def, group_dn, None)
+                group_reader = ldap3.Reader(
+                    connection, group_def, group_dn, None)
                 for entry in group_reader.search():
                     yield entry.name.value
                     for child in entry.memberOf:
@@ -189,20 +192,22 @@ try:
                 for group_dn in result.memberOf:
                     yield from _yield_recursive_groups(group_dn)
 
-
         def all_groups(self):
             connection = self.prepare_connection()
             connection.bind()
             obj_def = ldap3.ObjectDef("group", connection)
             group_reader = ldap3.Reader(connection, obj_def, self.group_dn)
-            for result in reader.search():
+            for result in group_reader.search():
                 yield result.name.value
+
 except ModuleNotFoundError:
     pass
 
 
 try:
-    import grp, pwd, pam
+    import grp
+    import pwd
+    import pam
 
     class PAMManager:
         def __init__(self, obsolete=False):
@@ -224,4 +229,3 @@ try:
                 yield group.gr_name
 except ModuleNotFoundError:
     pass
-

back.py

@@ -10,6 +10,7 @@ import config
 cookie = getattr(config, "REDIRECT_BACK_COOKIE", "back")
 default_view = getattr(config, "REDIRECT_BACK_DEFAULT", "index")
 
+
 def anchor(func, cookie=cookie):
     @functools.wraps(func)
     def result(*args, **kwargs):
@@ -17,8 +18,10 @@ def anchor(func, cookie=cookie):
         return func(*args, **kwargs)
     return result
 
+
 def url(default=default_view, cookie=cookie, **url_args):
     return session.get(cookie, url_for(default, **url_args))
 
+
 def redirect(default=default_view, cookie=cookie, **url_args):
     return flask_redirect(url(default, cookie, **url_args))

calendarpush.py

@@ -2,15 +2,16 @@ from datetime import datetime, timedelta
 import random
 import quopri
 
-from caldav import DAVClient, Principal, Calendar, Event
-from caldav.lib.error import PropfindError
+from caldav import DAVClient
 from vobject.base import ContentLine
 
 import config
 
+
 class CalendarException(Exception):
     pass
 
+
 class Client:
     def __init__(self, calendar=None, url=None):
         if not config.CALENDAR_ACTIVE:
@@ -23,9 +24,12 @@ class Client:
                 self.principal = self.client.principal()
                 break
             except Exception as exc:
-                print("Got exception {} from caldav, retrying".format(str(exc)))
+                print("Got exception {} from caldav, retrying".format(
+                    str(exc)))
         if self.principal is None:
-            raise CalendarException("Got {} CalDAV-error from the CalDAV server.".format(config.CALENDAR_MAX_REQUESTS))
+            raise CalendarException(
+                "Got {} CalDAV-error from the CalDAV server.".format(
+                    config.CALENDAR_MAX_REQUESTS))
         if calendar is not None:
             self.calendar = self.get_calendar(calendar)
         else:
@@ -41,9 +45,11 @@ class Client:
                     for calendar in self.principal.calendars()
                 ]
             except Exception as exc:
-                print("Got exception {} from caldav, retrying".format(str(exc)))
-        raise CalendarException("Got {} CalDAV Errors from the CalDAV server.".format(config.CALENDAR_MAX_REQUESTS))
-
+                print("Got exception {} from caldav, retrying".format(
+                    str(exc)))
+        raise CalendarException(
+            "Got {} CalDAV Errors from the CalDAV server.".format(
+                config.CALENDAR_MAX_REQUESTS))
 
     def get_calendar(self, calendar_name):
         candidates = self.principal.calendars()
@@ -57,12 +63,14 @@ class Client:
             return
         candidates = [
             Event.from_raw_event(raw_event)
-            for raw_event in self.calendar.date_search(begin, begin + timedelta(hours=1))
+            for raw_event in self.calendar.date_search(
+                begin, begin + timedelta(hours=1))
         ]
         candidates = [event for event in candidates if event.name == name]
         event = None
         if len(candidates) == 0:
-            event = Event(None, name, description, begin,
+            event = Event(
+                None, name, description, begin,
                 begin + timedelta(hours=config.CALENDAR_DEFAULT_DURATION))
             vevent = self.calendar.add_event(event.to_vcal())
             event.vevent = vevent
@@ -76,11 +84,14 @@ NAME_KEY = "summary"
 DESCRIPTION_KEY = "description"
 BEGIN_KEY = "dtstart"
 END_KEY = "dtend"
+
+
 def _get_item(content, key):
     if key in content:
         return content[key][0].value
     return None
-        
+
+
 class Event:
     def __init__(self, vevent, name, description, begin, end):
         self.vevent = vevent
@@ -97,7 +108,8 @@ class Event:
         description = _get_item(content, DESCRIPTION_KEY)
         begin = _get_item(content, BEGIN_KEY)
         end = _get_item(content, END_KEY)
-        return Event(vevent=vevent, name=name, description=description,
+        return Event(
+            vevent=vevent, name=name, description=description,
             begin=begin, end=end)
 
     def set_description(self, description):
@@ -105,7 +117,8 @@ class Event:
         self.description = description
         encoded = encode_quopri(description)
         if DESCRIPTION_KEY not in raw_event.contents:
-            raw_event.contents[DESCRIPTION_KEY] = [ContentLine(DESCRIPTION_KEY, {"ENCODING": ["QUOTED-PRINTABLE"]}, encoded)]
+            raw_event.contents[DESCRIPTION_KEY] = [ContentLine(
+                DESCRIPTION_KEY, {"ENCODING": ["QUOTED-PRINTABLE"]}, encoded)]
         else:
             content_line = raw_event.contents[DESCRIPTION_KEY][0]
             content_line.value = encoded
@@ -129,21 +142,28 @@ SUMMARY:{summary}
 DESCRIPTION;ENCODING=QUOTED-PRINTABLE:{description}
 END:VEVENT
 END:VCALENDAR""".format(
-            uid=create_uid(), now=date_format(datetime.now()-offset),
-            begin=date_format(self.begin-offset), end=date_format(self.end-offset),
+            uid=create_uid(),
+            now=date_format(datetime.now() - offset),
+            begin=date_format(self.begin - offset),
+            end=date_format(self.end - offset),
             summary=self.name,
             description=encode_quopri(self.description))
 
+
 def create_uid():
     return str(random.randint(0, 1e10)).rjust(10, "0")
 
+
 def date_format(dt):
     return dt.strftime("%Y%m%dT%H%M%SZ")
 
+
 def get_timezone_offset():
     difference = datetime.now() - datetime.utcnow()
-    return timedelta(hours=round(difference.seconds / 3600 + difference.days * 24))
+    return timedelta(
+        hours=round(difference.seconds / 3600 + difference.days * 24))
 
-def encode_quopri(text):
-    return quopri.encodestring(text.encode("utf-8")).replace(b"\n", b"=0A").decode("utf-8")
 
+def encode_quopri(text):
+    return quopri.encodestring(text.encode("utf-8")).replace(
+        b"\n", b"=0A").decode("utf-8")

check_routes.py

@@ -3,14 +3,20 @@ import regex as re
 import os
 import sys
 
-ROUTE_PATTERN = r'@(?:[[:alpha:]])+\.route\(\"(?<url>[^"]+)"[^)]*\)\s*(?:@[[:alpha:]_()., ]+\s*)*def\s+(?<name>[[:alpha:]][[:alnum:]_]*)\((?<params>[[:alnum:], ]*)\):'
+ROUTE_PATTERN = (
+    r'@(?:[[:alpha:]])+\.route\(\"(?<url>[^"]+)"[^)]*\)\s*'
+    r'(?:@[[:alpha:]_()., ]+\s*)*def\s+(?<name>[[:alpha:]][[:alnum:]_]*)'
+    r'\((?<params>[[:alnum:], ]*)\):')
 quote_group = "[\"']"
-URL_FOR_PATTERN = r'url_for\({quotes}(?<name>[[:alpha:]][[:alnum:]_]*){quotes}'.format(quotes=quote_group)
+URL_FOR_PATTERN = (
+    r'url_for\({quotes}(?<name>[[:alpha:]][[:alnum:]_]*)'
+    '{quotes}'.format(quotes=quote_group))
 
 ROOT_DIR = "."
 ENDINGS = [".py", ".html", ".txt"]
 MAX_DEPTH = 2
 
+
 def list_dir(dir, level=0):
     if level >= MAX_DEPTH:
         return
@@ -23,7 +29,8 @@ def list_dir(dir, level=0):
                 if file.endswith(ending):
                     yield path
         elif os.path.isdir(path):
-            yield from list_dir(path, level+1)
+            yield from list_dir(path, level + 1)
+
 
 class Route:
     def __init__(self, file, name, parameters):
@@ -38,13 +45,15 @@ class Route:
     def get_parameter_set(self):
         return {parameter.name for parameter in self.parameters}
 
+
 class Parameter:
     def __init__(self, name, type=None):
         self.name = name
         self.type = type
 
     def __repr__(self):
-        return "Parameter({name}, {type})".format(name=self.name, type=self.type)
+        return "Parameter({name}, {type})".format(
+            name=self.name, type=self.type)
 
     @staticmethod
     def from_string(text):
@@ -53,6 +62,7 @@ class Parameter:
             return Parameter(name, type)
         return Parameter(text)
 
+
 def split_url_parameters(url):
     params = []
     current_param = None
@@ -68,9 +78,11 @@ def split_url_parameters(url):
                 current_param += char
     return params
 
+
 def split_function_parameters(parameters):
     return list(map(str.strip, parameters.split(",")))
 
+
 def read_url_for_parameters(content):
     params = []
     bracket_level = 1
@@ -92,6 +104,7 @@ def read_url_for_parameters(content):
             elif char == ")":
                 bracket_level -= 1
 
+
 class UrlFor:
     def __init__(self, file, name, parameters):
         self.file = file
@@ -99,8 +112,10 @@ class UrlFor:
         self.parameters = parameters
 
     def __repr__(self):
-        return "UrlFor(file={file}, name={name}, parameters={parameters})".format(
-            file=self.file, name=self.name, parameters=self.parameters)
+        return (
+            "UrlFor(file={file}, name={name}, parameters={parameters})".format(
+                file=self.file, name=self.name, parameters=self.parameters))
+
 
 routes = {}
 url_fors = []
@@ -109,24 +124,29 @@ for file in list_dir(ROOT_DIR):
         content = infile.read()
         for match in re.finditer(ROUTE_PATTERN, content):
             name = match.group("name")
-            function_parameters = split_function_parameters(match.group("params"))
+            function_parameters = split_function_parameters(
+                match.group("params"))
             url_parameters = split_url_parameters(match.group("url"))
             routes[name] = Route(file, name, url_parameters)
         for match in re.finditer(URL_FOR_PATTERN, content):
             name = match.group("name")
             begin, end = match.span()
             parameters = read_url_for_parameters(content[end:])
-            url_fors.append(UrlFor(file=file, name=name, parameters=parameters))
+            url_fors.append(UrlFor(
+                file=file, name=name, parameters=parameters))
+
 
 for url_for in url_fors:
     if url_for.name not in routes:
-        print("Missing route '{}' (for url_for in '{}')".format(url_for.name, url_for.file))
+        print("Missing route '{}' (for url_for in '{}')".format(
+            url_for.name, url_for.file))
         continue
     route = routes[url_for.name]
     route_parameters = route.get_parameter_set()
     url_parameters = set(url_for.parameters)
     if len(route_parameters ^ url_parameters) > 0:
-        print("Parameters not matching for '{}' in '{}:'".format(url_for.name, url_for.file))
+        print("Parameters not matching for '{}' in '{}:'".format(
+            url_for.name, url_for.file))
         only_route = route_parameters - url_parameters
         only_url = url_parameters - route_parameters
         if len(only_route) > 0:

decorators.py

-from flask import redirect, flash, request, url_for
+from flask import flash
 
 from functools import wraps
 
 from models.database import ALL_MODELS
-from shared import db, current_user
+from shared import current_user
 import back
 
 ID_KEY = "id"
@@ -12,12 +12,15 @@ OBJECT_DOES_NOT_EXIST_MESSAGE = "There is no {} with id {}."
 
 MISSING_VIEW_RIGHT = "Dir fehlenden die nötigen Zugriffsrechte."
 
+
 def default_redirect():
     return back.redirect()
 
+
 def login_redirect():
     return back.redirect("login")
 
+
 def db_lookup(*models, check_exists=True):
     def _decorator(function):
         @wraps(function)
@@ -32,7 +35,8 @@ def db_lookup(*models, check_exists=True):
                 obj = model.query.filter_by(id=obj_id).first()
                 if check_exists and obj is None:
                     model_name = model.__class__.__name__
-                    flash(OBJECT_DOES_NOT_EXIST_MESSAGE.format(model_name, obj_id),
+                    flash(OBJECT_DOES_NOT_EXIST_MESSAGE.format(
+                        model_name, obj_id),
                         "alert-error")
                     return default_redirect()
                 kwargs[key] = obj
@@ -41,8 +45,10 @@ def db_lookup(*models, check_exists=True):
         return _decorated_function
     return _decorator
 
+
 def require_right(right, require_exist):
     necessary_right_name = "has_{}_right".format(right)
+
     def _decorator(function):
         @wraps(function)
         def _decorated_function(*args, **kwargs):
@@ -65,17 +71,22 @@ def require_right(right, require_exist):
         return _decorated_function
     return _decorator
 
+
 def require_public_view_right(require_exist=True):
     return require_right("public_view", require_exist)
 
+
 def require_private_view_right(require_exist=True):
     return require_right("private_view", require_exist)
 
+
 def require_modify_right(require_exist=True):
     return require_right("modify", require_exist)
 
+
 def require_publish_right(require_exist=True):
     return require_right("publish", require_exist)
 
+
 def require_admin_right(require_exist=True):
     return require_right("admin", require_exist)

legacy.py

 from datetime import datetime
-from fuzzywuzzy import fuzz, process
-import tempfile
+from fuzzywuzzy import process
 
-from models.database import Todo, OldTodo, Protocol, ProtocolType, TodoMail
+from models.database import OldTodo, Protocol, ProtocolType, TodoMail
 from shared import db
 
 import config
 
+
 def lookup_todo_id(old_candidates, new_who, new_description):
     # Check for perfect matches
     for candidate in old_candidates:
-        if candidate.who == new_who and candidate.description == new_description:
+        if (candidate.who == new_who
+                and candidate.description == new_description):
             return candidate.old_id
     # Accept if who has been changed
     for candidate in old_candidates:
@@ -32,11 +33,13 @@ def lookup_todo_id(old_candidates, new_who, new_description):
             new_description, best_match, best_match_score))
         return None
 
+
 INSERT_PROTOCOLTYPE = "INSERT INTO `protocolManager_protocoltype`"
 INSERT_PROTOCOL = "INSERT INTO `protocolManager_protocol`"
 INSERT_TODO = "INSERT INTO `protocolManager_todo`"
 INSERT_TODOMAIL = "INSERT INTO `protocolManager_todonamemailassignment`"
 
+
 def import_old_protocols(sql_text):
     protocoltype_lines = []
     protocol_lines = []
@@ -46,22 +49,27 @@ def import_old_protocols(sql_text):
         elif line.startswith(INSERT_PROTOCOL):
             protocol_lines.append(line)
     if (len(protocoltype_lines) == 0
-    or len(protocol_lines) == 0):
+            or len(protocol_lines) == 0):
         raise ValueError("Necessary lines not found.")
     type_id_to_handle = {}
     for type_line in protocoltype_lines:
-        for id, handle, name, mail, protocol_id in _split_insert_line(type_line):
+        for id, handle, name, mail, protocol_id in _split_insert_line(
+                type_line):
             type_id_to_handle[int(id)] = handle.lower()
     protocols = []
     for protocol_line in protocol_lines:
         for (protocol_id, old_type_id, date, source, textsummary, htmlsummary,
-            deleted, sent, document_id) in _split_insert_line(protocol_line):
+                deleted, sent, document_id) in _split_insert_line(
+                protocol_line):
             date = datetime.strptime(date, "%Y-%m-%d")
             handle = type_id_to_handle[int(old_type_id)]
-            protocoltype = ProtocolType.query.filter(ProtocolType.short_name.ilike(handle)).first()
+            protocoltype = ProtocolType.query.filter(
+                ProtocolType.short_name.ilike(handle)).first()
             if protocoltype is None:
-                raise KeyError("No protocoltype for handle '{}'.".format(handle))
-            protocol = Protocol(protocoltype_id=protocoltype.id, date=date, source=source)
+                raise KeyError(
+                    "No protocoltype for handle '{}'.".format(handle))
+            protocol = Protocol(
+                protocoltype_id=protocoltype.id, date=date, source=source)
             db.session.add(protocol)
             db.session.commit()
             import tasks
@@ -70,6 +78,7 @@ def import_old_protocols(sql_text):
         print(protocol.date)
         tasks.parse_protocol(protocol)
 
+
 def import_old_todomails(sql_text):
     todomail_lines = []
     for line in sql_text.splitlines():
@@ -98,28 +107,34 @@ def import_old_todos(sql_text):
         elif line.startswith(INSERT_TODO):
             todo_lines.append(line)
     if (len(protocoltype_lines) == 0
-    or len(protocol_lines) == 0
-    or len(todo_lines) == 0):
+            or len(protocol_lines) == 0
+            or len(todo_lines) == 0):
         raise ValueError("Necessary lines not found.")
     type_id_to_handle = {}
     for type_line in protocoltype_lines:
-        for id, handle, name, mail, protocol_id in _split_insert_line(type_line):
+        for id, handle, name, mail, protocol_id in _split_insert_line(
+                type_line):
             type_id_to_handle[int(id)] = handle.lower()
     protocol_id_to_key = {}
     for protocol_line in protocol_lines:
         for (protocol_id, type_id, date, source, textsummary, htmlsummary,
-            deleted, sent, document_id) in _split_insert_line(protocol_line):
+                deleted, sent, document_id) in _split_insert_line(
+                protocol_line):
             handle = type_id_to_handle[int(type_id)]
-            date_string = date [2:]
-            protocol_id_to_key[int(protocol_id)] = "{}-{}".format(handle, date_string)
+            date_string = date[2:]
+            protocol_id_to_key[int(protocol_id)] = "{}-{}".format(
+                handle, date_string)
     todos = []
     for todo_line in todo_lines:
-        for old_id, protocol_id, who, what, start_time, end_time, done in _split_insert_line(todo_line):
+        for (old_id, protocol_id, who, what, start_time, end_time,
+             done) in _split_insert_line(todo_line):
             protocol_id = int(protocol_id)
             if protocol_id not in protocol_id_to_key:
-                print("Missing protocol with ID {} for Todo {}".format(protocol_id, what))
+                print("Missing protocol with ID {} for Todo {}".format(
+                    protocol_id, what))
                 continue
-            todo = OldTodo(old_id=old_id, who=who, description=what,
+            todo = OldTodo(
+                old_id=old_id, who=who, description=what,
                 protocol_key=protocol_id_to_key[protocol_id])
             todos.append(todo)
     OldTodo.query.delete()
@@ -127,12 +142,16 @@ def import_old_todos(sql_text):
     for todo in todos:
         db.session.add(todo)
     db.session.commit()
-        
+
+
 def _split_insert_line(line):
     insert_part, values_part = line.split("VALUES", 1)
     return _split_base_level(values_part)
 
-def _split_base_level(text, begin="(", end=")", separator=",", string_terminator="'", line_end=";", ignore=" ", escape="\\"):
+
+def _split_base_level(
+        text, begin="(", end=")", separator=",", string_terminator="'",
+        line_end=";", ignore=" ", escape="\\"):
     raw_parts = []
     current_part = None
     index = 0
@@ -210,5 +229,3 @@ def _split_base_level(text, begin="(", end=")", separator=",", string_terminator
             fields.append(current_field)
         parts.append(fields)
     return parts
-        
-    

shared.py

 from flask_sqlalchemy import SQLAlchemy
-from flask import session, redirect, url_for, request
+from flask import session, redirect, url_for, flash
 
 import re
 from functools import wraps
@@ -11,9 +11,10 @@ import config
 
 db = SQLAlchemy()
 
-# the following code is written by Lars Beckers and not to be published without permission
+# the following code escape_tex is written by Lars Beckers
+# and not to be published without permission
 latex_chars = [
-    ("\\", "\\backslash"), # this needs to be first
+    ("\\", "\\backslash"),  # this needs to be first
     ("$", "\$"),
     ('%', '\\%'),
     ('&', '\\&'),
@@ -23,7 +24,6 @@ latex_chars = [
     ('}', '\\}'),
     ('[', '\\['),
     (']', '\\]'),
-    #('"', '"\''),
     ('~', r'$\sim{}$'),
     ('^', r'\textasciicircum{}'),
     ('Ë„', r'\textasciicircum{}'),
@@ -37,75 +37,99 @@ latex_chars = [
     ('<', '$<$'),
     ('>', '$>$'),
     ('\\backslashin', '$\\in$'),
-    ('\\backslash', '$\\backslash$') # this needs to be last
+    ('\\backslash', '$\\backslash$')  # this needs to be last
 ]
 
+
 def escape_tex(text):
     out = text
     for old, new in latex_chars:
         out = out.replace(old, new)
     # beware, the following is carefully crafted code
     res = ''
-    k, l = (0, -1)
-    while k >= 0:
-        k = out.find('"', l+1)
-        if k >= 0:
-            res += out[l+1:k]
-            l = out.find('"', k+1)
-            if l >= 0:
-                res += '\\enquote{' + out[k+1:l] + '}'
+    start,