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between a string without a single quote/double quote?Let's go into bash and write an example.[Email protected]:~$ x=123[email protected]-virtual-machine:~$ y=123 456No Command'456'found, did you mean:command'A56'From package'A56'(Universe)456: Command not found[email protected]-virtual-machine:~$ z="123 456"[email protected]-virtual-machine:~$Echo$x123[email pro

( ('1', '2'), #(4, 3), ('2', '3'), (('4', ), {'b': '5'}), ((), {'a': 5, 'b': 6}), {'a': 5, 'b': 6},)class TestFoo(paramunittest.ParametrizedTestCase): def setParameters(self, a, b): self.a = a self.b = b def testLess(self): self.assertLess(self.a, self.b)# 方案二@paramunittest.parametrized( ('1', '2'), #(4, 3), ('2', '3'), (('4', ), {'b': '5'}), ((), {'a': 5, 'b': 6}), {'a': 5, 'b': 6},)class TestBar(unittest.TestCase): def setParame

Equality operator = = If the If equality operator compares data of the same type when comparing different types of data with the strict equality operator else if equality operator: The original type of data is converted to a numeric type, and the string and Boolean values are translated into numeric values, and then null = = Undefined returns True one is an object, the other is a number or a string, and the object is converted to a basic type value, which is more than else false

The Jquery.type method is a tool method for detecting data types, summarizing the use of JS to provide us with the methods of monitoring data types before analyzing its usage;One, typeof operatorHere is the test codevar data=[],a= ' 123 ', b=0,c=true, d={1:23},e=[123],f=function() {},g=null New Date ();d Ata.push (a,b,c,d,e,f,g,h,i,j,k); for (var key=0;key) { console.log (Data[key]+ ' data type is '

Water men, water Today, a gentleman asked a Java question. What should the following code output: Class Demo{public static void main(String[] args){String s = "0";change(s);System.out.println(s);}static void change(String s){s = "123";}} To be honest, when this gentleman asked me a question, I was quite nervous. After all, he used to be an awesome architect in a company. In addition, people often encounter self-thought-simple problems and often feel

UK". title ()# "They're Bill's Friends From The Uk" Str. upper () If all letters in a string are converted to uppercase letters, the system automatically ignores the characters that cannot be converted to uppercase letters. 'Chinese abc def 12gh'. upper ()# 'Chinese abc def 12gh'Note that s. upper (). isupper () is not necessarily set to True. String format output Str. center (width [, fillchar])The string is centered according to the given width. A specific character can be filled with extra l

1, in three ways to achieve delete the last line of the file.[[email protected] sjx]# cat 123123[[email protected] sjx]# sed ' $d ' 12312[[email protected] sjx]# cat 123 |head-$[$ (cat 123|WC-L) -1]12[[email protected] sjx]# cat 123 |sed-n ' $!p ' 122, using three ways to achieve the matrix of generating 3*3.[[email protected] sjx]# for ((y=0;y3, the use of three

ASCII table, has corresponding characters for each Base64 code value. 64 readable characters from 0 to 63 No, this is the A-Z、a-z、0-9、+、/ origin of the Base64 name. In 16 binary form That is, the NSData form is saved, the BASE64 encoding result is a character, and these characters correspond to the code value of the ASCII code table, NSData is the code value that stores the ASCII code table.Here is an example of how the BASE64 encoding and decoding process is described in detail i

Students who have studied Java know that there is a data format for key-value pairs in Java--mapIn Python, there is a format similar to map, which is the dictionary (Dict)1. Create a Dictionary type Objectuser={ "username":"Dylan", " Age ":", "password":"123" }2. TraverseUser={ "username":"Dylan", " Age":" -", "Password":"123"} forKvinchUser.items ():Print(k +":"+V);Results: Username:dyl

#属于apache的一个组件, if not, install with Yum` yum install -y httpd htpasswd` #第一需要-c创建，-m强制md5加密New Password:Re-type New Password:The second time, add users do not need-C, if you use the-C will reset the file, only one record# htpasswd -m /usr/local/nginx/conf/htpasswd gavin New Password:Re-type New Password:Adding Password for user Gavinvim /usr/local/nginx/conf/enable-php.conf location ~ [^/]\.php(/|$) { try_files $uri =404; fastcgi_pass unix:/tmp/php-cgi-56.

onmysqladmin -uroot password "123"cp /usr/share/doc/mysql-server-5.1.73/my-medium.cnf /etc/my.cnfvim /etc/my.cnf [mysqld] 50 log-slave-updates/etc/init.d/mysqld restart4. Authorization and Master synchronizationmysql -u root -pmysql> grant replication slave on *.* to ‘slave‘@‘192.168.1.%‘ identified by ‘123‘;mysql> show master status;+------------------+----------+--------------+------------------+|

* represent 0 or more columns in a SELECT statement Special symbols / Terminating SQL statements Special symbols Comments Annotation characters ( Note: tested, above 3,4,5 Pass, not reliable, into trusting ) Here is a list of some commonly used special symbols, where we insert(directly write those can insert successful statements), the Statement installation table appears in the order of occurrence: Sql> C

, in the following command, the directory generated by the dircommand is appended to the dirlist.txt file: dir> dirlist.txt, which redirects the input to a command, just like sending the command output to a file or printer instead of a screen, you can obtain command input from a file instead of a keyboard. To obtain the input from a file, use a smaller sign ( 3. Application Example 1. Lock/unlock the Registry As you know, if the DWORD Value of "Disableregistrytools" under the hkey_current_userso

Advanced regular expression technology (Python version), regular expression python A regular expression is a Swiss Army knife that searches information for a specific pattern. They are a huge tool library, some of which are often ignored or underutilized. Today, I will show you some advanced usage of regular expressions. For example, this is a regular expression that we may use to detect American phone numbers: r'^(1[-\s.])?(\()?\d{3}(?(2)\))[-\s.]?\d{3}[-\s.]?\d{4}$' We can add some comments a

Common Interview Topics:1. Is the string a reference type or a value type?2. What is the best way to use string connection processing, and what is the rationale?3. What are some issues to be aware of when using StringBuilder?4. How many strings will be present in memory when the following code executes? What's the difference? What is the output of the result? Why is it?String st1 = "123" + "abc"; string st2 = "123ABC"; Console.WriteLine (St1 = = St2);

1. Regular expressionsA regular is a way to describe a string or character by combining symbols with special meanings.2. Common regular matching patternsImport rePrint(Re.findall ('\w','Hello_ | Egon 123'))#Match alphanumeric underlinePrint(Re.findall ('\w','Hello_ | Egon 123'))#match with small w non-numeric character underlinePrint(Re.findall ('\s','Hello_ | Egon 123