Python .write() 更改顺序

发布于 2024-10-05 19:28:49 字数 597 浏览 3 评论 0原文

我有一些问题：

f = open('OUTPUT.txt', 'w')

def function
    if  ........
      ......
   f.write(XXX)                 #this must be in this loop         #1.write
    else:
      ....
      ....

....other code...
................

with open("INPUT.txt") as f_in:
    for line in f_in:
        for char in line:
            frequencies[char] += 1
input= [(count, char) for char, count in frequencies.iteritems()]

f.write(' '.join("%s=%s" % (y, x) for x,y in input))            #2.write

f.close()

如你所见，我有 2x 写入“函数”，如何更改 txt 文件中的写入顺序；我想先写“input”，然后写“f.write(XXX)”

原文

I have some problem:

f = open('OUTPUT.txt', 'w')

def function
    if  ........
      ......
   f.write(XXX)                 #this must be in this loop         #1.write
    else:
      ....
      ....

....other code...
................

with open("INPUT.txt") as f_in:
    for line in f_in:
        for char in line:
            frequencies[char] += 1
input= [(count, char) for char, count in frequencies.iteritems()]

f.write(' '.join("%s=%s" % (y, x) for x,y in input))            #2.write

f.close()

As you can see, I have 2x write "function", how can I change writting order in txt file; I want to write first "input", then "f.write(XXX)"

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痴者 2024-10-12 19:28:50

是什么阻止您将字符频率计数循环放在 f.write(XXX) 循环之前？

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橙味迷妹 2024-10-12 19:28:50

您可以先使用临时文件写入它，然后将“输入”数据写入 OUTPUT.txt，然后将临时文件附加到输出。
如果数据不是很大（即适合内存），您可以使用 StringIO 。对于 Python 2.7：

import StringIO
temp = StringIO.StringIO()  
write xxx to temp file here  
...  
write 'input' data to output file here  
temp.seek(0) # sets current position in file to it's beginning  
for line in temp:  
    output.write(line)
temp.close()  
output.close()

You could use temp file to write to it first, then write 'input' data to OUTPUT.txt, then append temp file to output.
If the data isn't huge (ie. will fit in memory) you could use StringIO for that. For Python 2.7:

import StringIO
temp = StringIO.StringIO()  
write xxx to temp file here  
...  
write 'input' data to output file here  
temp.seek(0) # sets current position in file to it's beginning  
for line in temp:  
    output.write(line)
temp.close()  
output.close()

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