ZZZZZxxxAA

x='ZZZZZxxxAA'
i=0
stroka=[]
for j in x:
    if x[i]==x[i+1]:
        stroka=x[i]+str(x.count(x[i]))
        i=i+1
print stroka,

>>> 
Z5

Z5 x3 A2

x='ZZZZZxxxAA'
key=1
dic={}
i=0
while i < len(x)-1:
    if x[i]==x[i+1]:
        key+=1
        dic[x[i]]=key
    else:
        key=1
    i+=1
print dic.items()

x='ZZZZZxxxAA'
dic={}
for ch in x:
	dic[ch] = dic.get(ch,0)+1
print( dic )

x='ZZZZZxxxAA'
print( { ch:x.count(ch) for ch in set(x) } )

x='ZZZZZxxxAA'
dic={}
for ch in x:
    dic[ch] = dic.get(ch,0)+1
for key, value in dic.items():
    print key, value

x='ZZZZZxxxAA'
dic={ ch : x.count(ch) for ch in set(x) }
print( ' '.join( k+str(n) for k,n in dic.items() ) )

#python 3.1
from collections import OrderedDict
x='ZZZZZxxxAA'
dic=OrderedDict()
for ch in x:
    dic[ch] = dic.get(ch,0)+1
for key, value in dic.items():
    print (key, value)

x='ZZZZZxxxAA'
i=0
j=0
stroka=[]
while j<len(x)-1:
    if x[i]!=x[i+1]:
        print x[i]
        i=i+1
    else:
        i=i+1
    j=j+1