; fromCollectionsImportCounter>>> Counter (a[1]) Counter ({')': 6186,'@': 6157,'(': 6154,']': 6152,'#': 6115,'_': 6112,'[': 6108,'}': 6105,'%': 6104,'!': 6080,'+': 6066,'$': 6046,'{': 6046,'': 6043,'*': 6034,'^': 6030,'\ n': 1221,'-': 4,'a': 1,'T': 1,'I': 1,'L': 1,'': 1,'y': 1,'>': 1,'u': 1,'e': 1,'Q': 1})It's kind of interesting.Because the HTML is too large, I open it directly with Urlopen () and then take the regular expression out of that part (of course, in order to show the superiority of
Http://kodango.com/useful-documents-about-shell$$ the shell itself PID (ProcessID)$! PID of the Shell's last running background process$? The return value of the last command that was run to check whether the previous command executed successfully.$* all parameter lists, as a whole.[email protected] all parameter lists. Alone as a whole.$# the number of arguments added to the shell.The file name of the Shell itself."Shell Learning Notes" $#,[email protected], explaining the meaning of $
Anonymous functions:calc=Lambda x:x*3print(Calc (3)) # return 9Higher order functions:
You can pass a function name as an argument to another function
The return value can contain a function name
Adorner :Essentially a function that adds additional functionality to other functions
Cannot modify the source code of the decorated function
Cannot modify the method of invocation of a decorated regret
Simple Adorner example-run time for statistical functions:Im
There are three different parameters to the function:
General parameters
Default parameters
Dynamic parameters# ######### define function ########## name is called the formal parameter of function func, abbreviation: Parameterdef func (name):Print (name)# ######### Execute function ########## ' Fuyuteng ' is called the actual argument of function func, abbreviation: argumentFunc (' Fuyuteng ') def func (name, age = 18print (" %s:%s (name,age)) # specify parameter func ( ' fuyuteng ", 19)
The string $s = ' A, B, C (x, y ("Z", 2, 0)), D, E ';
Split into arrays, the difficulty is C (x, y ("Z", 2, 0)), is a whole.
Desired Result:
Array
' A ',
' B ',
' C (x, y ("Z", 2, 0)) ',
' D ',
' E ');
Reply to discussion
Preface
In Linux, all devices are regarded as files. Each time a file is opened, there is a file descriptor that represents the file to be opened. When the program starts, three I/O device files are opened by default: stdin, stdout, and stderr. The file descriptors 0, 1, and 2 are obtained respectively.
Instance
Now let's look at an example of testing the ttyname function (the ttyname function returns the p
server available, giving up.VFS: Unable to mount root FS via NFS, trying floppy.VFS: cannot open root device "mtdblock2" or unknown-block (2, 0)Please append a correct "root =" Boot option; here are the available partitions:Kernel panic-not syncing: VFS: Unable to mount root FS on unknown-block (2, 0)
[Solution proces
Lucas theorem: N is written in P-ary A[n]a[n-1]a[n-2]...a[0], and M is written in P-b[n]b[n-1]b[n-2]...b[0], then C (n,m) and C (A[n],b[n]) *c (a[n-1],b[n-1]) *c ( A[n-2],b[-2]) *....*c (a[0
Reprinted from: Cardiac Note (http://493420337.iteye.com/blog/593981)--------------------------------------------------------------------------------------------------------------- --------------------------------------------------Chomsky divides the method into four types, namely, type 0, 1, 2 and type 3. The concept of these types of grammar must be mastered and is a very important test center. For these
return in the generator function will trigger a stopiteration exceptionFunction:Zip (iter1[, iter2[, ...]) returns a Zip object that is used to generate tuples, and the number of tuples is determined by the smallest iteration objectEnumerate (iterable[, start]) generates an indexed enumeration object, returning an iterative type of index-value pair (Index-value pair), the default index is zero-based, or it can be specified with start (Sort custom labels)byte strings and byte arraysByte string b
Endpoint 0 is the best way to test the driver, I will later put the Linux driver experience, this buddy wrote how to send data: http://www.lcsky.org/2.0/node/43
Control transmission is useful when a small amount of control information is exchanged, such as sending commands and obtaining the status of the lower computer. It is convenient to use control transmission through the cypress standard firmware framework, you only need to add your own processi
Always think that int A [256] = {0}; Is to initialize all elements of a to 0, int A [256] = {1 }; is to initialize all elements of a to 1. when debugging, I found that the memory was not the same thing. I flipped through the C ++ programming language and finally made a conclusion. If the PDF file is not copied, it will be translated in this chapter. The following 5.2.1 array initialization array can be init
Length
Decimal digits
Identity
Primary key
FOREIGN key
Allow empty
Default value
Description
1
Id
Int
4
0
Is
Is
Whether
Primary Key ID
2
NAME
nvarchar
50
Javascript Learning Guide 0---2
Okay. Pretty girls have read it. Let's continue with the content of the last lecture (the content of the previous section)Control statement:
First, I would like to sum up a total9
Expires/expires + CgogaWYg0 ++ expires/Cw + bAtLfWsfDOqtXivLi49r/Y1sbT777kvtm49sD919MKPHA + expires = "brush: java;"> var I = 10; if (I> 15) {alert ("I> 15")} else if (I
Var I
Topic:Number 0 to n (inclusive) in number 2 appears several times.Ideas:1, violent methods, the number of each number contains a few 2, and then summed up.2, Analysis: Consider the number of each digit n each occurrence 2 times, such as 123123;Consider 4123123 from left to r
From: Http://www.hivemq.com/blog/mqtt-essentials-part-6-mqtt-quality-of-service-levelsQuality of Servicewhat is quality of Service?The quality of Service (QoS) level was an agreement between sender and receiver of a message regarding the Guarant Ees of delivering a message. There is 3 QoS levels in MQTT:
At the most once (0)
At least once (1)
exactly once (2).
When talking about QoS th
Finding the root x^3-5x^2+16x-80=0 of a three-order equation by using the chord-truncation method#include #include float f (float x)//define sub-function f (x) = X^3-5x^2+16x-80, when f (x) →0, then x is the real number root of the request;{Float y;Y= ((x-5.0) *x+16.0) *x-80.0;return (y); Returns the value of f (x)}Flo
In the previous section, the flowchart we drew, remember? Judging the part we will, the difference cycle, below I will introduce three kinds of commonly used loops.Loop structure while loop (when looping, at least my C language teacher calls it)Let's introduce the syntax, as follows while (conditional expression) { // Here is the loop body, when the above condition expression is true, the loop body is executed, otherwise exits }While followed by a conditional expression, the loop is executed
$# is the number of arguments passed to the script. $ is the name of the script itself. $ is the first parameter passed to the shell script, and the second argument that is passed to the shell script is [email protected] is a list of all the parameters passed to the script $* is to display all parameters passed to the script in a single string, unlike positional variables, which can be more than 9 $$ is the current process ID number for the script to run? is to display the exit status of the las
As mentioned in chapter 13th daemon (pp. 343-344) of advanced Unix programming, you can use the following method to enable/dev/null for daemon, make it have file descriptors 0, 1, and 2./* Close */For (I = 0; I {Close (I );}Fd0 = open ("/dev/null", o_rdonly );Fd1 = DUP (0 );Fd2 = DUP (
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