http://stackoverflow.com/questions/10931150/phps-strtr-for-python

gistfile1.txt

def strtr_kojiro(strng, replace):
    if replace and strng:
        s, r = replace.popitem()
        return r.join(strtr_kojiro(subs, dict(**replace)) for subs in strng.split(s))
    return strng

def strtr_aix(s, repl):
  pattern = '|'.join(map(re.escape, sorted(repl.keys(), key=len, reverse=True)))
  return re.sub(pattern, lambda m:repl[m.group(0)], s)

def strtr_gumbo(strng, replace):
    buffer = []
    i, n = 0, len(strng)
    while i < n:
        match = False
        for s, r in replace.items():
            if strng[i:len(s)+i] == s:
                buffer.append(r)
                i = i + len(s)
                match = True
                break
        if not match:
            buffer.append(strng[i])
            i = i + 1
    return ''.join(buffer)

def strtr_thg(strng, replace):
    buffer, i = [], 0
    while i < len(strng):
        for s, r in replace.items():
            if strng[i:len(s)+i] == s:
                buffer.append(r)
                i += len(s)
                break
        else:
            buffer.append(strng[i])
            i += 1
    return ''.join(buffer)

import re

funcs = [x for x in dir() if x.startswith('strtr')]

# make sure everything works fine

for f in funcs:
    j = globals()[f]('aa-bb-cc', {'aa': 'bbz', 'bb': 'x', 'cc': 'y'})
    assert j == 'bbz-x-y', f
    j = globals()[f]('aa-bb-cc' * 10, {'aa': 'bbz', 'bb': 'x', 'cc': 'y'})
    assert j == 'bbz-x-y' * 10, f


from timeit import timeit
setup = 'from __main__ import ' + ','.join(funcs)

# test with a short subject (thg wins)

s = 'aa-bb-cc'
r = {'aa': 'bbz', 'bb': 'x', 'cc': 'y'}

times = [(timeit("%s(%r,%r)" % (f, s, r), setup, number=5000), f) for f in funcs]
for p in sorted(times): 
    print '%.4f %s' % p

# test with a longer subject (aix wins)

s = 'aa-bb-cc' * 10
r = {'aa': 'bbz', 'bb': 'x', 'cc': 'y'}

times = [(timeit("%s(%r,%r)" % (f, s, r), setup, number=5000), f) for f in funcs]
for p in sorted(times): 
    print '%.4f %s' % p