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Basic Python Tutorial _ Learning Note 10: Exceptions

SyntaxError Thrown when the code is in the wrong form TypeError Thrown when a built-in operation or function is applied to an object of the wrong type ValueError Thrown when a built-in operation or function is applied to an object of the correct type, but the object uses an inappropriate value. Zerodivisionerror The second parameter in a division or modulo operation is 0 thrown when Define the Exception class y

[Iphone development] NSDateFormatter format string

a:am/pm a:0~86399999 (millisecond of day) C/cc:1~7 (Day of Week) Ccc:sun/mon/tue/wed/thu/fri/sat Cccc:sunday/monday/tuesday/wednesday/thursday/friday/saturday D:1~31 (0 padded day of Month) d:1~366 (0 padded day of the year) E:1~7 (0 padded day of Week) E~eee:sun/mon/tue/wed/thu/fri/sat Eeee:sunday/monday/tuesday/wednesday/thursday/friday/saturday F:1~5 (0 padded Week of Month, day of Week = Monday) G:julian Day number (number of days since 4713 BC January 1) G~ggg:bc/ad (Era designator abb

Learning notes TF032: Implementing Google Inception Net and tf032inception

consecutive Inception module groups. The structure of the 1st Inception Module group is similar to that of the Inception Module. 1st Inception Module group: 1st Inception modules, named Mixed_5b. Slim. arg_scope sets the default parameters of all Inception module groups. The step size of all convolution layers, maximum pooling, and average pooling layers is set

Oralce data import troubleshooting (SYSTEM. PROC_AUDIT and Audit)

Oralce data import troubleshooting (SYSTEM. PROC_AUDIT and Audit) When you export the data of USERNAME user of Data A and then import the data to USERNAME in database B, the following problems occur during table data query by USERNAME User: www.2cto.com ORA-06550: 1st rows, 7th columns: PLS-00201: must declare the identifier 'System. PROC_AUDIT 'ora-06550: 1st rows, 7th columns: PL/SQL: Statement ignored th

Solve some problems that occur when reading an Excel table in the SQL Server Query analyzer.

Several problems encountered when reading Excel in the sql2005 query analyzer, collected all the resources on the Internet, and finally solved the problem. Many answers on the Internet are pasted and copied, therefore, it cannot be used in the actual environment. I believe many of my friends have encountered the same mistakes. To avoid the same mistakes, I would like to share them with you:Environment:System: windows7,Database: Sqlserver2005,Office: office2003 SQLCommonly used Excel reading meth

. NET garbage collection (GC) principle, garbage collection gc

compression (more compact ). After compression, the variables and CPU registers that point to the pointers of these objects will now become invalid. The Garbage Collector must re-access all the roots and modify them to point to the new memory location of the object. This causes significant performance loss. This loss is also the main drawback of the hosting heap. Based on the above features, the garbage collection algorithm caused by garbage collection is also a research topic. Because it would

. NET garbage collection (GC) principle, garbage collection gc

implement memory compression (more compact ). After compression, the variables and CPU registers that point to the pointers of these objects will now become invalid. The Garbage Collector must re-access all the roots and modify them to point to the new memory location of the object. This causes significant performance loss. This loss is also the main drawback of the hosting heap. Based on the above features, the garbage collection algorithm caused by garbage collection is also a research topic.

The IOS design Cheat Sheet interface designed for quick reference

Portrait Landscape iphone 5 iphone 5, 5S, 5C 640x1136 px 1136x640 px IPhone 4/4s 640x960 px 960x640 px IPhone IPod Touch 1st, 2nd and 3rd Generation 320x480 px 480x320 px Retina ipad ipad 3, ipad 4, ipad Air 1536x2048 px 2048x1536 px IPad Mini 768x1024 px 1024x768 px IPad Mini Retina 1536x2

Git study Note 3

7. instances with multiple branches and merged implementations 1. instances with merged conflicts [root @ localhost ~] # Mkdir-pgitbranche [root @ localhostbranche] # cp-rv... wanyan *. Lazy '... wanyanREADME-'. README '.. wanyanlib-'. lib '.. wanyanlibcomment 7. instances that contain multiple branches and merged implementations 1. instances with merged conflicts [Root @ localhost ~] #Mkdir-P/Git/BraNcHe [Root @ localhost branche] #Cp-Rv ../wanyan/*. // get lazy. '../Wanyan/README'-> './README

Pacifier-crack Wireless

is to use airolib to construct the dictionary into a WPA table. Then use aircrack to crack the attack. Building a WPA table is the hash Hash hash value generated after calculation using the same algorithm as WPA encryption. In this way, such a file is called for comparison when cracking is required, the cracking efficiency can be greatly improved. Crack key (hash): cowpatty + hash WPA cracking does not need to wait until the data reaches tens of thousands, because itOnly one packet containin

Chapter 6 binary, octal, and hexadecimal in vernacular C ++

and C ++ do not provide a method to directly write binary numbers in code.   This problem can be solved in hexadecimal or octal. Because,The larger the number, the shorter the expression length.. However, why is it 16 or 8 hexadecimal instead of 9 or 20? 2, 8, and 16 are respectively the power 1 of 2, the Power 3, and the Power 4. This allows the three hexadecimal systems to directly convert each other. In octal or hexadecimal mode, the binary number is shortened, but the expression of binary n

Algorithms and sorting (6)

); // divide R [low... high] Quicksort (R, low, pivotpos-1); // recursively sorts the left Interval Quicksort (R, pivotpos + 1, high); // recursively sorts the right range } } // Quicksort Note: To sort the entire file, you only need to call quicksort (R, 1, n) to sort the R [L. N. 3. Partition Algorithm(1) Simple Partitioning Method① Specific practices Step 1: (initialize) set two pointers, I and j. Their initial values are the lower and upper bounds of the interval, that is, I = low and I = hi

Binary, hexadecimal, and octal

binary number is maintained. In the following course about hexadecimal conversion, you can find this point. 6.2 Ii. Convert hexadecimal to decimal 6.2.1 Convert binary to decimal 0th bits in binary are 0 to the power of 2, and 1st bits are 1 to the power of 2 ...... Therefore, there is a binary number: 0110 0100, which is converted to a 10-digit system: The following is a vertical layout: 0110 0100 to decimal 0th-Bit 0*20= 0

Who said Delphi has no hash?

(now, datepointer );Mmo1.lines. Add ('1st thashedstringlist Creation Time: '+ inttostr (hsltime) + 'millisecond '); Datepointer: = now ();For I: = 0 to 200 doBeginTempint: = HSL. indexof ('string _ '+ inttostr (I * 1000 ));End;Hsltime: = millisecondsbetween (now, datepointer );Mmo1.lines. Add ('1970 string SEARCH thashedstringlist time consumed: '+ inttostr (hsltime) + 'millisecond '); Datepointer: = now;For I: = 1 to 200000 doBeginTempstr: = HSL. St

Introduction to SVM (10) use SVM for multiclass classification

-time solution is too large to be practical. A few steps back, we will think of the so-called "one class for the rest" method, that is, each time we still solve a problem of two categories. For example, we have five categories. For the first time, we set the sample of Class 1 as a positive sample, and the samples of the remaining 2, 3, and 4 as negative samples. In this way, we can obtain a classifier of two categories, it can point out whether an article is not of the

IP datagram for sharding

IP sharding (as we will see later, t c p tries to avoid sharding, but for applications, it is almost impossible to force t c p to send a long packet segment that needs to be split ). We can use the s o c k program to increase the length of the datagram until the multipart occurs. On an Ethernet network, the maximum length of a data frame is 1 5 0 0 bytes (see Figure 2-1), where 1 4 7 2 bytes is left to the data, assuming that the IP header is 2 0 bytes, the UDP header is 8 bytes. We run the s o

Simple use of Glade + example (1)

First, I use fedora 6. Because the version is relatively new, the graphic interface is good, the glade function is better, and the glade translation is better. It includes glade2.0, gcc4.0, and GTK graphic interface library GTK + 2.6. However, the memory requirements are relatively high. Especially when using virtual machines, the brothers will find that the memory must be adjusted to MB to enter the GUI installed in the system and run XWindow (and compare cards), preferably above MB.2. Enter t

Learn the efficiency of using a cursor

1. Why cursor: A major reason for using cursor is to convert the set operation into a single record processing method. After retrieving data from a database using SQL, the results are stored in a memory area, and the results are often a collection containing multiple records. The cursor mechanism allows you to access these records row by row in SQL Server and display and process these records as you wish. 2. How to use a cursor: Generally, using a cursor follows the following general steps:

35 tips for using workbooks

operations ".2. Open the "Custom" dialog box and click "new" in the "toolbar" tab. The "new tool" dialog box appears.In the "bar" dialog box, enter the name "professional symbol". After confirming, a toolbar appears in the workspace.Switch to the "command" tab, select "macro" under "category", and click "Custom button" under "command ".Drag "item to the" professional symbols "Column (the buttons are dragged when there are many special symbols ).3. select one of the "Custom buttons" and name the

Concepts of mdx

entities (such as dimensions and levels. Therefore, it is not always necessary to explicitly reference members. For example, the firstchild function allows you to retrieve all members from a specific dimension or level. To obtain the first child Member of the time dimension, You can explicitly declare the member, as shown in the following example: time. [1st half], you can also use the firstchild function to return the same members, such as time. fir

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