我必须将子流程的输出转储到以附加模式打开的文件中
from subprocess import Popen
fh1 = open("abc.txt", "a+") # this should have worked as per my understanding
# fh1.readlines() # Adding this solves the problem
p = Popen(["dir", "/b"], stdout = fh1, shell=True)
print p.communicate()[0]
fh1.close()
上面的代码覆盖了我不想要的文件
abc.txt，取消注释fh1.readlines()会将光标移动到适当的位置，这是一个临时解决方案有什么基本的我想念的吗？
In [18]: fh1 = open("abc.txt",'a')
In [19]: fh1.tell() # This should be at the end of the file
Out[19]: 0L
In [20]: fh1 = open("abc.txt",'r')
In [21]: print fh1.readlines()
['1\n', '2\n', '3\n', '4\n', '5\n']
最佳答案
将光标放在文件末尾而不读取文件的简单方法是:
fh1.seek(2)
# .seek(offset, [whence]) >> if offset = 2 it will put the cursor in the given position relatively
# to the end of the file. default 'whence' position is 0, so at the very end
关于python - 在追加模式下将子流程输出转储到文件中，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/14332141/