Conditional Expressions建立一些逻辑关系 The conditional expression classes from django.db import models class Client(models.Model): REGULAR = 'R' GOLD = 'G' PLATINUM = 'P' ACCOUNT_TYPE_CHOICES = ( (REGULAR, 'Regular'), (GOLD, 'Gold'), (PLATINUM, 'Platinum'),…

1.Decompose Conditional(分解条件表达式) 2.Consolidate Conditional Expressions(合并条件表达式) 3.Consolidate Duplicate Conditional Fragments(合并重复的条件片段) 4.Remove Control Flag(移除控制标记) 5.Replace Nested Conditional with Guard Clauses(以卫语句取代嵌套条件表达式) 6.Replace Conditiona…

函数中的条件逻辑,使人难以看清正常的执行路径. 使用卫语句表现所有特殊情况. double getPayAmount() {double result;if (_isDead) result = deadAmount();else {if (_isSeparated) result = separatedAmount();else {if (_isRetired) result = retiredAmount();else result = normalPayAmount();};}return…

Not all conditional expressions can be compiled using conditional moves. Most significantly, the abstract code we have shown evaluates both then-expr and else-expr regardless of the test outcome. If one of those two expressions could possibly generat…

2017/6/30 转载写明出处:http://www.cnblogs.com/daren-lin/p/anonymous-classes-and-lambda-expressions-in-java.html 本来在查看官方文档中的collection介绍,介绍到如何遍历(traverse)一个容器时提到一个方法是聚合操作(Aggregate Operations),感觉这个写法比较简洁,而且从来没接触过,于是进一步了解.而为了了解Aggregate Operations,必须复习总结一下本文…

http://delphi.wikia.com/wiki/CompilerVersion_Constant The CompilerVersion constant identifies the internal version number of the Delphi compiler. It is defined in the System unit and may be referenced either in code just as any other constant: if Com…

Given a string representing arbitrarily nested ternary expressions, calculate the result of the expression. You can always assume that the given expression is valid and only consists of digits 0-9, ?, :, T and F (T and Frepresent True and False respe…

Given a string representing arbitrarily nested ternary expressions, calculate the result of the expression. You can always assume that the given expression is valid and only consists of digits 0-9, ?, :, T and F (T and F represent True and False resp…

http://linux.about.com/library/cmd/blcmdl1_sh.htm http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html Linux / Unix Command: shCommand LibraryNAMEbash - GNU Bourne-Again SHell SYNOPSISbash [options] [file] DESCRIPTIONBash is an sh…

Item 14: Prefer Exceptions to Returning None Functions that returns None to indicate special meaning are error prone because None and other values (e.g., zero, the empty string) all evaluate to False in conditional expressions. Raise exceptions to in…