The htmlentitydefs
module contains a dictionary with many ISO Latin-1 character
entities used by HTML. Its use is demonstrated in Example 5-10.
Example 5-11 shows how to combine regular expressions with
this dictionary to translate entities in a string (the opposite of
cgi.escape
).
Example 5-11. Using the htmlentitydefs Module to Translate Entities
File: htmlentitydefs-example-2.py import htmlentitydefs import re import cgi pattern = re.compile("&(w+?);") def descape_entity(m, defs=htmlentitydefs.entitydefs): # callback: translate one entity to its ISO Latin value try: return defs[m.group(1)] except KeyError: return m.group(0) # use as is def descape(string): return pattern.sub(descape_entity, string) print descape("<spam&eggs>") print descape(cgi.escape("<spam&eggs>"))<spam&eggs>
<spam&eggs>
Finally, Example 5-12 shows how to use translate reserved XML
characters and ISO Latin-1 characters to an XML string. This is
similar to cgi.escape
, but it also replaces
non-ASCII characters.
Example 5-12. Escaping ISO Latin-1 Entities
File: htmlentitydefs-example-3.py import htmlentitydefs import re, string # this pattern matches substrings of reserved and non-ASCII characters pattern = re.compile(r"[&<>"x80-xff]+") # create character map entity_map = {} for i in range(256): entity_map[chr(i)] = "&%d;" % i for entity, char in htmlentitydefs.entitydefs.items(): if entity_map.has_key(char): entity_map[char] = "&%s;" % entity def escape_entity(m, get=entity_map.get): return string.join(map(get, m.group()), "") def escape(string): return pattern.sub(escape_entity, string) print escape("<spam&eggs>") print escape("303245 i 303245a 303244 e 303266")<spam&eggs>
å i åa ä e ö
3.145.172.146