Question

假设我正在将stdout写入文件，如下所示：

sys.stdout = open("file.txt", "w")
# print stuff here

这样做不起作用：

sys.stdout.close()

如何在向stdout写入文件后关闭文件？

Answer 1

我的问题是：“如何将sys.stdout重定向到文件？”

import sys

# we need this to restore our sys.stdout later on
org_stdout = sys.stdout

# we open a file
f = open("test.txt", "w")
# we redirect standard out to the file
sys.stdout = f
# now everything that would normally go to stdout
# now will be written to "test.txt"
print "Hello world!\n"
# we have no output because our print statement is redirected to "test.txt"!
# now we redirect the original stdout to sys.stdout
# to make our program behave normal again
sys.stdout = org_stdout
# we close the file
f.close()
print "Now this prints to the screen again!"
# output "Now this prints to the screen again!"

# we check our file
with open("test.txt") as f:
    print f.read()
# output: Hello World!

这是你问题的答案吗？

Answer 2

你可以这样做：

import sys

class writer(object):
    """ Writes to a file """

    def __init__(self, file_name):
        self.output_file = file_name

    def write(self, something):
        with open(self.output_file, "a") as f:
            f.write(something)

if __name__ == "__main__":
    stdout_to_file = writer("out.txt")
    sys.stdout = stdout_to_file
    print "noel rocks"

只有在您这样写文件时，该文件才会打开。

Answer 3

如果要将所有print（）重定向到文件，也可以执行此操作，这是一种快速的方法，我认为也是有用的，但它可能会产生其他影响。如果我错了，请纠正我。

import sys

stdoutold = sys.stdout
sys.stdout = fd = open('/path/to/file.txt','w')
# From here every print will be redirected to the file
sys.stdout = stdoutold
fd.close()
# From here every print will be redirected to console

关闭正在写入stdout的文件

3 个答案: