python菜鸟一问，请大大们解答，谢谢 关于python的菜鸟问题，望大神解答
python\u83dc\u9e1f\u6c42\u89e3\u2026\u5404\u4f4d\u5927\u5927\u8c22\u8c22\u4e86\uff01compute_frequencies \u662f\u4e2a\u51fd\u6570\u540d \u4e0b\u5212\u7ebf\u53ef\u4ee5\u505a\u4e3a\u53d8\u91cf\u540d\u7684\u4e00\u90e8\u5206
for word,freq in freqs:
print word,freq
freqs\u662f\u4e2aiterable\u5bf9\u8c61 \u4f8b\u5982[(1,2), (3,4)] for\u5faa\u73af\u7b2c\u4e00\u6b21\u53d6word=1,freq=2\uff0c\u6253\u5370\uff1b\u7b2c\u4e8c\u6b21word=3,freq=4\uff0c\u6253\u5370
word,freq \u6784\u6210tuple\u7c7b\u578b\u5bf9\u8c61 \u7701\u53bb\u4e86\u62ec\u53f7 \u548c(word,freq)\u4e00\u6837
\u770b\u4f60\u7ed9\u7684\u4ee3\u7801 page=download page \u597d\u50cf\u6709\u95ee\u9898 \u65b9\u4fbf\u7684\u8bdd\u628a\u5168\u90e8\u4ee3\u7801\u8d34\u4e0a\u6765\u5427
----------------
page=download page \u8fd9\u4e2a\u5e94\u8be5\u6709\u95ee\u9898 \u4f60\u518d\u597d\u597d\u770b\u770b\u4e66\u5427
\u4f60\u5e94\u8be5\u662f\u6ca1\u8003\u8651\u5230\u6700\u540e\u4e00\u884c\u4e0d\u662f\u7a7a\u767d\u884c\u7684\u60c5\u51b5\uff0c\u8fd9\u6837\u6700\u540e\u4e00\u884c\u5c31\u65e0\u6cd5\u6839\u636e\u5224\u65ad\u6761\u4ef6yield\u4e86\uff0c\u4f60\u53ef\u4ee5\u5728\u540e\u9762\u52a0\u4e00\u53e5\u8bdd\u6d4b\u8bd5\u4e0b\uff0c\u5982\u4e0b\uff1a
def lines(file):
for line in file: yield line
def blocks(file):
block = []
for line in lines(file):
if line.strip():
block.append(line)
elif block:
yield ''.join(block).strip()
block = []
print(len(block))
>>> import string
>>> string.atoi('10') + 4
14
分析：错误原因说，name 'string' is not defined，意思是string没有定义。。。所以import一下就好啦。。
int('10')
#= python3 的 string 包含的操作 =#
>>>dir(string)
['Formatter', 'Template', '_TemplateMetaclass', '__builtins__', '__cached__', '__doc__', '__file__', '__name__', '__package__', '_multimap', '_re', '_string', 'ascii_letters', 'ascii_lowercase', 'ascii_uppercase', 'capwords', 'digits', 'hexdigits', 'octdigits', 'printable', 'punctuation', 'whitespace']
print string.atoi('10',4)
import string
右键->Edit with IDLE.
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