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Don't understand why UnboundLocalError occurs (closure) [duplicate]

What am I doing wrong here? 8 Answers 8 ...
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How do function pointers in C work?

I had some experience lately with function pointers in C. 11 Answers 11 ...
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What is the difference between `sorted(list)` vs `list.sort()`?

list.sort() sorts the list and replaces the original list, whereas sorted(list) returns a sorted copy of the list, without changing the original list. ...
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Convert floats to ints in Pandas?

I've been working with data imported from a CSV. Pandas changed some columns to float, so now the numbers in these columns get displayed as floating points! However, I need them to be displayed as integers, or, without comma. Is there a way to convert them to integers or not display the comma? ...
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How exactly does a generator comprehension work?

What does generator comprehension do? How does it work? I couldn't find a tutorial about it. 6 Answers ...
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How to get multiple counts with one SQL query?

I am wondering how to write this query. 9 Answers 9 ...
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Clear the entire history stack and start a new activity on Android

Is it possible to start an activity on the stack, clearing the entire history before it? 13 Answers ...
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In Clojure 1.3, How to read and write a file

I'd like to know the "recommended" way of reading and writing a file in clojure 1.3 . 6 Answers ...
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Why is it important to override GetHashCode when Equals method is overridden?

Given the following class 14 Answers 14 ...
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How to check if a file exists in Documents folder?

I have an application with In-App Purchase, that when the user buy something, download one html file into the Documents folder of my app. ...