import subprocess
with open("fout.txt", "a") as out:
subprocess.Popen("ls", stdout=out)
With this minimum information I can't help you a lot but I'll suggest you do something like this :
with open("fout.txt","a") as out:
subprocess.Popen("starting_cmd",stdout=out)
The process don't need to read info so we don't need to open the file in reading mode (and it's a best practice to restrain the access to a file to only what's necessary). You could therefore replace w+ with just w or a (to append fout.txt).
The with is for context managing to be sure the file is closed when out goes out of scope, which can potentially help to make the result visible in the file.
Here's a working example (in python3) :
import subprocess
with open("fout.txt", "a") as out:
subprocess.Popen("ls", stdout=out)
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使用此最低信息，我无法为您提供很多帮助，但我建议您做类似的事情：
W+替换为W或a（为了附加fout.txt）。用于上下文，以确保当out脱离范围时，该文件已关闭，这有可能有助于使结果在文件中可见。这是一个有效的例子（在Python3中）：
With this minimum information I can't help you a lot but I'll suggest you do something like this :
w+with justwora(to appendfout.txt).withis for context managing to be sure the file is closed whenoutgoes out of scope, which can potentially help to make the result visible in the file.Here's a working example (in python3) :