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What is the difference between up-casting and down-casting with respect to class variable

What is the difference between up-casting and down-casting with respect to class variable? 10 Answers ...
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How to write inline if statement for print?

I need to print some stuff only when a boolean variable is set to True . So, after looking at this , I tried with a simple example: ...
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How can I check if a directory exists in a Bash shell script?

What command can be used to check if a directory exists or not, within a Bash shell script? 35 Answers ...
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How do I check to see if a value is an integer in MySQL?

I see that within MySQL there are Cast() and Convert() functions to create integers from values, but is there any way to check to see if a value is an integer? Something like is_int() in PHP is what I am looking for. ...
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Git vs Team Foundation Server [closed]

I introduced Git to my dev team, and everyone hates it except me. They want to replace it with Team Foundation Server. I feel like this is a huge step backwards, although I am not very familiar with TFS. Can someone with experience compare branching support on TFS to Git branching? Also, in general,...
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Why can't overriding methods throw exceptions broader than the overridden method?

I was going through SCJP 6 book by Kathe sierra and came across this explanations of throwing exceptions in overridden method. I quite didn't get it. Can any one explain it to me ? ...
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What is the difference between shallow copy, deepcopy and normal assignment operation?

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How do I get the parent directory in Python?

Could someone tell me how to get the parent directory of a path in Python in a cross platform way. E.g. 19 Answers ...
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append multiple values for one key in a dictionary [duplicate]

I am new to python and I have a list of years and values for each year. What I want to do is check if the year already exists in a dictionary and if it does, append the value to that list of values for the specific key. ...
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Casting a variable using a Type variable

In C# can I cast a variable of type object to a variable of type T where T is defined in a Type variable? 12 Answers ...