关于python编写文件的问题

Question

I've got a weird problem with python programming. I used the statement'writelines()' to write a series of lists into a new file.During the process I could see the context in the file icon via preview, however once after the program finished running the output file comes out to be a blank file.

In short, my problem is that the program doesn't have any output but a blank file.

Here's the code:

infile=open('/Users/Jim/Desktop/py/result.txt','r')
outfile=open('/Users/Jim/Desktop/py/output.txt','a')
line=infile.readline()
i=1
while(line):
    check=str(i)+':'
    if line.startswith(check):
        i+=1
        block=[infile.readline() for j in range(1,7)]
        judge=block[1].split()
        for j in judge:
            if j=='stem' or j=='differetiation' or j=='differetiating':
                outfile.write(str(i)+':\n')
                outfile.writelines(block)    #check if the paragraph has the given key words, if true then write the paragraph into the output file.
                break
    line=infile.readline()
outfile.close()
infile.close()

Some additional information if helpful: The python version is 2.6.3, and the os is Mac OS 10.6.

Answer 1

I guess it's caused by incorrect indentation. The break statement should be inside the if block. The loop as it is written will only try the first option from judge . Check if you don't have mixed spaces and tabs in the file.