len()@python

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

输入line3时曾犯的错误：

print ('the length of your name is ',len(myName))
输出结果为：
What is your name?
han meimei
('the length of your name is ', 10)

line3显示为一元组

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

将逗号改为加号后，字符串与数值属于不同类型数据，无法相加