Python --替换字符串中的字串

def extend(format,d,maker=‘"‘,safe=True):

if safe:

def lookup(w): return d.get(w,w.join(maker*2))

else:

def lookup(w): return d[w]

parts=format.split(maker)

print parts

parts[1::2]=map(lookup, parts[1::2])

print parts

return ‘ ‘.join(parts)

if __name__==‘__main__‘:

print extend(‘just "a" test‘,{‘b‘:‘one‘})