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How to use `subprocess` command with pipes

... Instead, create the ps and grep processes separately, and pipe the output from one into the other, like so: ps = subprocess.Popen(('ps', '-A'), stdout=subprocess.PIPE) output = subprocess.check_output(('grep', 'process_name'), stdin=ps.stdout) ps.wait() In your particular case, however, the simp...
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How to add leading zeros for for-loop in shell? [duplicate]

... only work in >=bash-4. If you want to use printf, nothing prevents you from putting its result in a variable for further use: $ foo=$(printf "%02d" 5) $ echo "${foo}" 05 share | improve this an...
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How can I calculate the difference between two dates?

... date using e.g. an NSDateFormatter, the NSDateFormatter converts the time from the configured timezone. Therefore, the number of seconds between two NSDate objects will always be time-zone-agnostic. Furthermore, this documentation specifies that Cocoa's implementation of time does not account for ...
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ImportError: No module named matplotlib.pyplot

...As ..) Step 2: Take note of where the file got saved and cd the directory from command prompt. Run the get-pip.py script to install pip. You can write in cmd this line within quotes: "python .\get-pip.py" Step 3: Now in cmd type: pip install matplotlib And you should be through. ...
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How to change the background color of the options menu?

...gt;@color/overflow_background</item> ... </style> Tested from API 4.2 to 5.0. share | improve this answer | follow | ...
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Unable to execute dex: GC overhead limit exceeded in Eclipse

...arbage Collector to release memory. This way you can protect the workspace from crashing this kind of error :D This could be an ultimate solution because you can't increase the VM value beyond your RAM limit if you very frequently open your android XML especially if you do lot of UI works like me :...
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What is the EAFP principle in Python?

... From the glossary: Easier to ask for forgiveness than permission. This common Python coding style assumes the existence of valid keys or attributes and catches exceptions if the assumption proves false. This clean and fas...
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Can you make valid Makefiles without tab characters?

... is like one of those pungee stick traps in The Green Berets: the poor kid from Kansas is walking point in front of John Wayne and doesn’t see the trip wire. After all, there are no trip wires to watch out for in Kansas corn fields. WHAM! ...
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How to measure time taken between lines of code in python?

...nWarning: time.clock has been deprecated in Python 3.3 and will be removed from Python 3.8: use time.perf_counter or time.process_time instead – ismailarilik Dec 3 '18 at 7:55 2 ...
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Clear Application's Data Programmatically

... anyone using android:manageSpaceActivity. Whenever I use this, I do so from a manageSpaceActivity which has android:process=":manager". There, I manually kill any other processes of my app. This allows me to let a UI stay running and let the user decide where to go next. private static void kil...