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Update Python_Programming_Quiz.md

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`372`	`372`	`for word in`
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	`375`	`+#### 21. If you installed a module with pip but it doesn’t import in your IDLE, what could it possibly be?`
	`376`	`+`
	`377`	`+#### 22. If while installing a package with pip, you get the error No matching installation found, what can you do?`
	`378`	`+`
	`379`	`+#### 23. What is the difference between a Python module and a Python library?`
	`380`	`+`
	`381`	`+#### 24. Explain memory management in Python. (Optional: for CS Students)`
	`382`	`+Python manages objects by using __reference counting__. <br>`
	`383`	`+This means that the memory manager keeps track of the number of references to each object in the program.<br>`
	`384`	`+When an object's reference count drops to __zero__, which means the object is no longer being used, __the garbage collector (part of the memory manager) automatically frees the memory from that particular object.__`
	`385`	`+`
	`386`	`+The user need not to worry about memory management as __the process of allocation and de-allocation of memory is fully automatic__. The reclaimed memory can be used by other objects.`
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