print " What is your name?"
myName= raw_input()
print ('the length of your name is '+str(len(myName)) )

輸入line3時曾犯的錯誤：

print ('the length of your name is ',len(myName))
輸出結果為：
What is your name?
han meimei
('the length of your name is ', 10)

line3顯示為一元組

File "len().py", line 3, in <module>
print ('the length of your name is '+ len(myName))
TypeError: cannot concatenate 'str' and 'int' objects

將逗號改為加號后，字符串與數(shù)值屬于不同類型數(shù)據(jù)，無法相加