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How to construct a timedelta object from a simple string

I'm writing a function that needs a timedelta input to be passed in as a string. The user must enter something like "32m" or "2h32m", or even "4:13" or "5hr34m56s"... Is there a library or something that has this sort of thing already implemented? ...
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Are 2^n and n*2^n in the same time complexity?

Resources I've found on time complexity are unclear about when it is okay to ignore terms in a time complexity equation, specifically with non-polynomial examples. ...
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What is the difference between PS1 and PROMPT_COMMAND

While taking a look at this awesome thread I noticed that some examples use 6 Answers ...
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Code for Greatest Common Divisor in Python [closed]

The greatest common divisor (GCD) of a and b is the largest number that divides both of them with no remainder. 20 Answers ...
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How can I manually generate a .pyc file from a .py file

For some reason, I can not depend on Python's "import" statement to generate .pyc file automatically 8 Answers ...
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What is a Manifest in Scala and when do you need it?

Since Scala 2.7.2 there is something called Manifest which is a workaround for Java's type erasure. But how does Manifest work exactly and why / when do you need to use it? ...
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How to check if activity is in foreground or in visible background?

I have a splash screen on a timer. My problem is that before I finish() my activity I need to check that the next activity has started because a system dialogue box pops-up and I only want to finish() ; once the user has selected an option from the dialogue box? ...
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C++, What does the colon after a constructor mean? [duplim>catm>e]

I have some C++ code here: 6 Answers 6 ...
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How do I validate a date string format in python?

I have a python method which accepts a date input as a string . 5 Answers 5 ...
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Calling C++ class methods via a function pointer

How do I obtain a function pointer for a class member function, and later call that member function with a specific object? I’d like to write: ...