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Python /
StringBuilder
Migrated to http://pythonadventures.wordpress.com/2010/09/27/stringbuilder/. If you want to build a string from several pieces, then use a list, and join the elements of the list at the end. This is much more efficient than concatenating strings since strings are immutable objects, thus if you concatenate a string with another, then the result will be a NEW string object.
def g():
sb = []
for i in range(30):
sb.append("abcdefg"[i%7])
return ''.join(sb)
print g() # abcdefgabcdefgabcdefgabcdefgab
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