import string
class multi_replace:
def __init__(self,keep=[],debug=''):
self.keep={};self.debug=0
if debug: self.debug=1
if keep:
for i in keep: self.keep[i]=1
else:
#keep all keyboard characters plus whitespace
for i in string.printable: self.keep[i]=1
#remove space characters except for ' '
for i in string.whitespace:
if i==' ': continue #whitespace is valid
if i in self.keep: del self.keep[i]
def replace(self,line,new_char):
bad=0;changed=0
#keep on replacing until there are no bad characters left
while 1:
clean=1
for c in line:
if c not in self.keep:
clean=0
line=line.replace(c,new_char)
changed=1
#cannot continue replacing since line has changed w/for loop
break
#break the while loop if nothing bad was found
if clean: break
if self.debug and changed: print line
return line
