parrot

, l=[]):L.append (a)Return LPrint (f (1))Print (f (2))Print (f (3))This will output:[1][1, 2][1, 2, 3]If you do not want the default values to accumulate in subsequent calls, you can define the function as follows:Def f (A, L=none):If L is None:L = []L.append (a)Return LKeyword parametersFunctions can be called in the form of keyword arguments keyword argument, such as Kwarg=value. For example, the following function:def parrot (Voltage, state= ' a st

can actually do very interesting things. Like using eval, you can create a function directly from the user's input. This allows the program to change depending on the time or user input, and you can get amazing results by extrapolate. In practice, eval is rarely used, but perhaps you've seen someone use eval to get objects that are difficult to index. One of the problems with the Document Object Model (DOM) is that sometimes it is painful to get the object you ask for. For example, here's a fun

value.The default value is passed in when the function is defined, as follows:i = 5def f (arg=i): Print Argi = 6f ()The example above shows 5.Note: The default value is assigned only once. The result is different when the default value is a Mutable object (such as a list, dictionary, or an instance of most classes). Instance:Def f (A, l=[]):L.append (a)Return LPrint f (1)Print F (2)Print F (3)Execution Result:[1][1, 2][1, 2, 3]Evasion mode:Def f (A, L=none):If L is None:L = []L.append (a)Return

can create a function directly from the user's input. This allows the program to change the program itself based on time or user input, by taking a counter Three, you can get amazing results. In practice, eval is rarely used, but perhaps you've seen someone use eval to get objects that are difficult to index. One of the problems with the Document Object Model (DOM) is that sometimes it is painful to get the object you ask for. For example, here's a function that asks the user which image to t

The required material underwater image Volkswagen Beetle Balloon Fish Seabed Plant Brush Bubble brushes Parrot Butterfly Starfish Step 1th: Add background to open underwater image footage in Photoshop. 2nd step: Make the image more colorful copy of the underwater image, and then set the blending mode to overlay, in the entry filter > Blur-> radial blur, so that the picture looks like a little dynamic effect. Set the following fig

pass and the reference. If a function receives a reference to a mutable object (such as a dictionary or a list), it can modify the original value of the object-the equivalent of passing the object through a "pass reference". If a function receives a reference to an immutable object (such as a number, character, or tuple), it cannot directly modify the original object-the equivalent of passing the object through a "pass value". ParametersDefault parameter: Sets the default value for the par

soup! 5. four mice boast: A: I take the mouse medicine as sugar every day; B: I do not step on the mouse every day to itch; C: I do not have to go on the street several times a day; D: it's not too early. Let's go home and hold the cat. 6. the sky is blue, the sea is deep, and none of the man's words is true; love is eternal, blood is bright red, and men cannot beat; if men are rich, everyone has an affinity. When a man lives on it, pigs climb trees. 7. A group of ant financial climbed up the b

! 5. four mice boast: A: I take the mouse medicine as sugar every day; B: I do not step on the mouse every day to itch; C: I do not have to go on the street several times a day; D: it's not too early. Let's go home and hold the cat. 6. the sky is blue, the sea is deep, and none of the man's words is true; love is eternal, blood is bright red, and men cannot beat; if men are rich, everyone has an affinity. When a man lives on it, pigs climb trees. 7. A group of ant financial climbed up the back o

By learning language software, you can learn multiple languages with small parrots that understand many languages (e.g. English, Spanish, German, French, Italian, Japanese, Korean, or more). No matter when and where you are, the parrot will practice your reading and listening skills with you, and you will find that learning the language is so simple and easy. 1. This phrase collection contains more than 300 commonly used phrases and words. You

observe, what characteristics//first, declare an interface below the namespaceInterfaceianimalable {//There can be no field in the interface, there are methods, there are natural properties voidsay (); stringName {Get; Set; } }Interfaceipersonable {voidHisay (); }//an interface can inherit multiple interfaces at the same timeInterfaceistudentable:ianimalable,ipersonable {voidHisay (); }//Define a Parrot class under the namespace, inherit and

The theme of the speech: "The fastest shortcut in the world"- -Author: Zhenhua JackTell us a story.one day the monkeys and parrots took the same plane to travel. The monkey said to the stewardess: "Please have a bottle of mineral water". Then left to wait also do not come, right and so do not come, is annoyed at the time, only heard someone shouting behind: "Lao Tze's XO?" Why don't you come and get the smoke? ”。 The monkey thought, who is this, so bull X? Looking back, it turned out to be

: getattribute _ PPs ($ node, $ a. name); # RAKUDO+ # My $ value = pir: getattribute _ PPs ($ node, $ a. name); # RAKUDO+ My $ value = $ a. get_value ($ node); # for non-parrot$ Repr {$ name} = $ value; }$. Dump_node ($ repr );$. Seen and $! Is seen lost? In fact, $. seen is equivalent to declaring $ First! Then, a method seen () {return $! is automatically created! Seen }. The other is the pir: getattribute _ PPs () function. pir is the language on

books that make countless languages eye-catching, it is a pity that it needs to be expanded for average people. Perl5 enables perl5 to use modules in other languages, or when calling Perl from other languages, you have to deal with xs, read its documentation, and understand Bottom-layer details, of course, some tools such as swig can help you a lot, but it is not a long journey after all. This is one of the reasons for the small number of third-party Perl extensions, At that time, perlnet (a pl

Original address: Http://docs.pythontab.com/python/python3.4/controlflow.html#tut-functionsFunctions can be called in the form of keyword arguments , such as keyword = value . For example, the following function:defParrot (Voltage, state='a stiff', action='Voom', type='Norwegian Blue'): Print("--This parrot wouldn ' t", Action, end=' ') Print("If you put", Voltage,"volts through it.") Print("--lovely plumage, the", type)Print("--It ' s", st

#-*-coding:cp936-*- #下面这个函数接受voltage为必选参数, the remaining three are optional parameters Defparrot (voltage,state= ' Astiff ', action= ' voom ', type= ' Norwegianblue '):p rint ("--thisparrotwouldn ' t", action,end= ' ') print ("Ifyouput", Voltage, "Voltsthroughit") print ("--lovelyplumage, The ", type) print ("--it ' s ", State,"! ") #在调用时, in addition to the first required parameter, all parameters must indicate the keyword, the order is not important parro