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String concatenation vs. string substitution in Python

In Python, the where and when of using string concatenation versus string substitution eludes me. As the string concatenation has seen large boosts in performance, is this (becoming more) a stylistic decision rather than a practical one? ...
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How does database indexing work? [closed]

Given that indexing is so important as your data set increases in size, can someone explain how indexing works at a database-agnostic level? ...
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std::string formatting like sprintf

I have to format std::string with sprintf and send it into file stream. How can I do this? 40 Answers ...
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MYSQL import data from csv using LOAD DATA INFILE

I am importing some data of 20000 rows from a CSV file into Mysql. 11 Answers 11 ...
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PHP 5: const vs static

In PHP 5, what is the difference between using const and static ? 7 Answers 7 ...
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In Python, how do I create a string of n characters in one line of code?

I need to generate a string with n characters in Python. Is there a one line answer to achieve this with the existing Python library? For instance, I need a string of 10 letters: ...
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Linux command to list all available commands and aliases

Is there a Linux command that will list all available commands and aliases for this terminal session? 20 Answers ...
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Can virtual functions have default parameters?

If I declare a base class (or interface class) and specify a default value for one or more of its parameters, do the derived classes have to specify the same defaults and if not, which defaults will manifest in the derived classes? ...
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Get the first N elements of an array?

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Removing duplicate rows in Notepad++

Is it possible to remove duplicated rows in Notepad++, leaving only a single occurrence of a line? 12 Answers ...