python:标识符中的字符无效

我正在处理HP Code wars 2012中的字母分配问题。我不断收到一条错误消息，指出标识符中的无效字符.这是什么意思，以及如何解决.这是带有信息的页面. hpcodewars.org/past/cw15/problems/2012ProblemsFinalForPrinting.pdf 这是代码

import  string
def  text_analyzer(text):
'''The text to be parsed and
the number of occurrences of the letters given back
be. Punctuation marks, and I ignore the EOF
simple. The function is thus very limited.
'''
    result =  {}
# Processing
    for  a in  string.ascii_lowercase:
    result [a] =  text.lower (). count (a)
    return  result

def  analysis_result (results):
# I look at the data
    keys =  analysis.keys ()
    values \u200b\u200b=  list(analysis.values \u200b\u200b())
    values.sort (reverse = True )
# I turn to the dictionary and
# Must avoid that letters will be overwritten
    w2 =  {}
    list =  []
    for  key in  keys:
        item =  w2.get (results [key], 0 )
        if  item = =  0 :
            w2 [analysis results [key]] =  [key]
        else :
            item.append (key)
            w2 [analysis results [key]] =  item
# We get the keys
    keys =  list (w2.keys ())
    keys.sort (reverse = True )
    for  key in  keys:
        list =  w2 [key]
        liste.sort ()
        for  a in  list:
            print (a.upper (), "*"  *  key)        

text =  """I have a dream that one day this nation will rise up and live out the true
meaning of its creed: "We hold these truths to be self-evident, that all men
are created equal. "I have a dream that my four little children will one day
live in a nation where they will not be Judged by the color of their skin but
by the content of their character.
# # # """
analysis result =  text_analyzer (text)
analysis_results (results)