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python中的file重用错误
Shuang0420 edited this page May 31, 2016
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f = open('test', 'r') output = open('output.seq', 'w') count = len(f.readlines()) print count # read file and separate words for line in f: line=line.strip('\n') seg_list = jieba.cut(line) output.write(' '.join(seg_list) + '\n')
打印count,但是不会写入文件
重新打开或者是保存文件内容
f = open('test', 'r') output = open('output.seq', 'w') input=f.readlines() count = len(input) print count # read file and separate words for line in input: line=line.strip('\n') seg_list = jieba.cut(line) output.write(' '.join(seg_list) + '\n')
并不知道如何解释原因,因此姑且称这种现象为file不能重用问题,同样的,当我们试图两次去读取文件时,第二次并不会读到,如下代码。所以尽量可以避免这种写法,用readlines实现文件内容的读取。
f = open('test', 'r') for line in f: print line for line in f: print line
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