a = '1'
for i in xrange(30):
pos = 0
tmp = ''
str_len = len(a)
while pos < str_len:
count = 1
while pos+1<str_len and a[pos] == a[pos+1]:
count += 1
pos += 1
tmp += '%d%s'%(count,a[pos])
pos += 1
a = tmp
print(len(a))纠结！