關閉與標準輸出文件被寫入到它

Question

假設我寫stdout到一個文件中，就像這樣：

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

這樣做行不通：

sys.stdout.close() 

我怎樣才能關閉文件寫完stdout後呢？

Answer 1

我將您的問題表示爲：「我如何將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! 

這是您的問題的答案？

Answer 2

你可以這樣做：當你寫它這樣

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" 

文件只開放。