ChuckLu - 博客园

2022年9月17日

摘要：直接打开Python app,出现命令行 turtle.home() 打开面板 turtle.position() 查看当前位置 turtle.heading() 查看当前方向 https://docs.python.org/3/library/turtle.html https://docs.py 阅读全文

posted @ 2022-09-17 10:16 ChuckLu 阅读(166) 评论(0) 推荐(0)

What does end=' ' exactly do?

摘要： What does end=' ' exactly do? So, I'm struggling trying to understand this kinda simple exercise def a(n): for i in range(n): for j in range(n): if i 阅读全文

posted @ 2022-09-17 10:07 ChuckLu 阅读(39) 评论(0) 推荐(0)

不用中间变量交换 a ，b（三种方法）

摘要：不用中间变量交换 a ，b（三种方法） 1、加减法：该方法可以交换整型和浮点型数值的变量，但在处理浮点型的时候有可能出现精度的损失 a = a + b; b = a - b; a = a - b; 2、异或法：可以完成对整型变量的交换，对于浮点型变量它无法完成交换。 a = a^b; b = a^b 阅读全文

posted @ 2022-09-17 09:30 ChuckLu 阅读(189) 评论(0) 推荐(0)

Python eval

摘要： eval('123')+eval('456') eval('123'+'456') '123'+'456' 123+456 eval('print(12)') 阅读全文

posted @ 2022-09-17 09:07 ChuckLu 阅读(23) 评论(0) 推荐(0)

Please stop citing TIOBE google trending

摘要： Please stop citing TIOBE What is TIOBE? The TIOBE Programming Community index is an indicator of the popularity of programming languages. The index is 阅读全文

posted @ 2022-09-17 00:38 ChuckLu 阅读(58) 评论(0) 推荐(0)

2022年9月16日

ComboBox- SelectionChanged event has old value, not new value

摘要： ComboBox- SelectionChanged event has old value, not new value 回答1 According to MSDN, e.AddedItems: Gets a list that contains the items that were selec 阅读全文

posted @ 2022-09-16 16:31 ChuckLu 阅读(107) 评论(0) 推荐(0)

How do you handle a ComboBox SelectionChanged in MVVM?

摘要： How do you handle a ComboBox SelectionChanged in MVVM? For those doing pure MVVM, how do you handle a ComboBox SelectionChanged event without revertin 阅读全文

posted @ 2022-09-16 16:03 ChuckLu 阅读(291) 评论(0) 推荐(0)

2022年9月15日

How to delete an object by id with entity framework

摘要： How to delete an object by id with entity framework It seems to me that I have to retrieve an object before I delete it with entity framework like bel 阅读全文

posted @ 2022-09-15 13:59 ChuckLu 阅读(35) 评论(0) 推荐(0)

Like Operator in Entity Framework?

摘要： Like Operator in Entity Framework? 回答1 This is an old post now, but for anyone looking for the answer, this link should help. Go to this answer if you 阅读全文

posted @ 2022-09-15 10:52 ChuckLu 阅读(45) 评论(0) 推荐(0)

2022年9月14日

CHARINDEX case sensitive

摘要： https://www.sqlservercentral.com/forums/topic/charindex-is-not-case-sensitive SELECT CHARINDEX('x', 'X') 这个不区分大小写下面这个会区分大小写 SELECT CHARINDEX('x' coll 阅读全文

posted @ 2022-09-14 18:08 ChuckLu 阅读(24) 评论(0) 推荐(0)

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