CODEWITHSUNDEEP
pythonlogging
bob morane
bob morane

Reputation: 660

How to simulate a "myscript.py > mylog.txt"

I try to implement an option which will save the console output additionally into a file. (if the option is activated)

I found two ways: 1. to use the logging module 2. to write a class like this:

class MyWriter: 
    def __init__(self, stdout, filename): 
        self.stdout = stdout 
        self.logfile = file(filename, 'a') 
    def write(self, text): 
        self.stdout.write(text) 
        self.logfile.write(text) 
    def close(self): 
        self.stdout.close() 
        self.logfile.close()

But I got a problem. Some pieces of code will execute in a new process. And this ways does not catch their prints.

When I start my program like 

"myscript.py > mylog.txt"

it works. He got all prints. But how can I simulate this functionally in my script?

Upvotes: 1

Views: 205

Answers (3)

luc
luc

Reputation: 43096

My suggestion would be to use the logging module, to use a sockethandler and to push to a socket server that would write the received logs into a file.

I hope it helps

Upvotes: 1

Ilya Smagin
Ilya Smagin

Reputation: 6152

If I understand you correctly, you want to redirect stdout of other process that you start right?

Then all you have to do is use 

subprocess.Popen(...)

command. Then you have use your MyWriter class with it.

Upvotes: 1

Ski
Ski

Reputation: 14487

Problem probably has to be solved how you execute a new process, you either need to collect output from sub-process in main-process, or pass a filename to sub-process. You can use environment variables for filename instead of passing it as argument, then it will be easy to access log file in sub-process too.

Upvotes: 0

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