Recommended 6 articles about operational logic

The core idea of ​​and and or operations in python——Short-circuit logic I recently started to read Liao Xuefeng’s python tutorial, and I plan to put "learn python the hard way" first, because the last few chapters still feel a bit difficult (ok , I’m too weak, but take your time, step by step), thinking that after reading Liao Xuefeng’s tutorial, I might get some ideas if I look back. Okay, let’s get back to the subject. The reason why I write this today is because the and/or operation appears in the filter chapter of Liao Xuefeng’s tutorial. This was not mentioned in the previous tutorials. When I first read it, I was a little confused and confused. The code As follows: #Delete the empty string in a sequence ​ 1> def not_empty(s): 2> &

1. Sharing an example tutorial on the operation logic of and / or in python

Introduction: The core idea of ​​the and and or operations in python - short-circuit logic. I recently started reading Liao Xuefeng's python tutorial, and I plan to put "learn python the hard way" first, because the last few Chapter feels a bit difficult (ok, I'm too weak, but take your time, one step at a time). I thought that if I look back after reading Liao Xuefeng's tutorial, I might be able to get some ideas.

2. Wedding songs suitable for weddings Introduction to the combination of PHP ternary operators

Introduction: Marriage Songs suitable for weddings: Wedding songs Suitable songs for weddings Introduction to the associativity of PHP ternary operators: Let’s look at a ternary operator first: Copy the code as follows: Generally follow According to the rules of other languages ​​(such as C or Java), the operation logic of the above code is: Copy the code as follows: $a<$b => true => 'xx' ==> End then the most

3. Time complexity of recursive algorithm PHP cleverly uses arrays to reduce the time complexity of the program

Introduction: Time complexity of recursive algorithm: Time complexity of recursive algorithm in PHP. Clever use of arrays to reduce program time complexity: About the author Wang Dandan, a software engineer at IBM China System and Technology Center. Since joining IBM in 2006, he has been engaged in Web system design and development, and has worked on PHP applications for five years. Design and development experience. Usually when developers write programs, they often translate the already designed or conceived operational logic directly into a programming language. It is very gratifying that the program can be successfully compiled and passed. If the running time of the program is still acceptable at this time, you will be immersed in the sense of accomplishment of writing code, and often ignore the optimization of the code in the process. Only

4. PHP comparison operations and logical operations, php operation logic_PHP tutorial

Introduction: PHP comparison operations and logical operations, PHP operation logic. PHP comparison operations and logical operations, PHP operation logic 1. The following values ​​are judged to be true using empty(): unassigned variables, undeclared variables, 0, "0", "", false, null, empty array array()

5. PHP’s comparison operations and logical operations, php operation logic

Introduction: PHP’s comparison operations and Logical operations, php operation logic. PHP comparison operations and logical operations, PHP operation logic 1. The following values ​​are judged to be true using empty(): unassigned variables, undeclared variables, 0, "0", "", false, null, empty array array()

6. PHP cleverly uses arrays to reduce the time complexity of the program_PHP

Introduction: Usually developers When writing a program, the computational logic that has been designed or conceived is often translated directly into a programming language.

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