introduction to computing using python

))#list to set, go to heavy - - #Inverse Polish expression implementation the defRPN (LST): -stack = []#Initialize Stack - forIinchLst:#iterating through the list of passed-in expressions - ifI.isdigit ():#if it is a number, go directly to the stack + stack.append (Fraction (I.strip ())) - Else: + ifIinchDict_op:#if operator, two elements are removed for operation A Try: atA =Stack.pop () -b =Stack.pop () - Stack.append (Dict_op (b, a)) -

Principle of Computing (Python) Study Notes (7) DFS Search + Tic Tac Toe use MiniMax Stratedy, minimaxstratedy1. Trees Tree is a recursive structure. 1.1 math nodes Https://class.coursera.org/principlescomputing-001/wiki/view? Page = trees 1.2 CODE tree without parent domain Http://www.codeskulptor.org/#poc_tree.py class Tree: """ Recursive definition for trees plus various tree methods """

= Arithmeticexpression ("3", []) print one print One.evaluate () One_plus_two = arithmeticexpression ("+", [one, both]) print one_plus_two print One_plus_two.ev Aluate () One_plus_two_times_three = Arithmeticexpression ("*", [One_plus_two, three]) print one_plus_two_times_th REE Import POC_DRAw_tree Poc_draw_tree. Treedisplay (one_plus_two_times_three) print one_plus_two_times_three.evaluate () run_example ()2 ListIn Python, lists is primarily iterat

one of the two arrays to access: A (:, I0,i1), since I0 and I1 are broadcast after the shape is (2,2,3), in the 1, 2 axes replace the shape of a array, the last obtained shape is: (3,2,2,3);If a is accessed with two arrays, and two arrays are not contiguous: a (I0,:,I1), the second axis is the last dimension, that is, the shape should be the shape of the post-broadcast shape plus the slice axis: (2,2,3,4)Boolean array as SubscriptWhen a Boolean array is used as subscript, it is equivalent to

ChoiceList is the value under each condition, with If-elif-else as:If CONDLIST[0]:? ? CHOICELIST[0]Elif Condlist[1]:? ? CHOICELIST[1]Elif Condlist[2]:? ? CHOICELIST[2]such asThe piecewise (x, condlist, funclist) function is designed to avoid the need to use many arrays to store the segmented structure when the segment is relatively long, and the piecewise () function can calculate the result directly from the segmented list without needing an intermediate fragment array; and select ( ) paramete

Matplotlibpython科学计算系列Matplotlib is Python's most famous drawing library, which provides a complete set of command APIs similar to those of MATLAB, making it ideal for interactive mapping. It can also be easily used as a drawing control, embedded in GUI applications.Its documentation is quite complete, and there are hundreds of thumbnails on the gallery page, and the source program opens. So if you need to draw some kind of diagram, just browse/copy/paste it on this page and basically get it don

, assuming the next step continues human Move,human or alive.For IDX in range (len (list1)): My homework."" "Student portion of Zombie Apocalypse mini-project" "" Import randomimport poc_gridimport poc_queueimport poc_zombie_ gui# Global Constantsempty = 0 full = 1four_way = 0eight_way = 1OBSTACLE = "obstacle" HUMAN = "HUMAN" ZOMBIE = "ZOMBIE" class Zombie (Poc_grid. Grid): "" "Class for simulating zombie pursuit of human in grid with obstacles" "Def __init__ (self, grid_ Height, grid_width

be extracted by an array named key;The Savetxt (), Loadtxt () function can read and write a text file that holds a one-dimensional and two-dimensional array, outputs the text separated by the spacer, specifies the spacer by the delimiter parameter, and the default output is in the form of '%.18e ', separated by a space by default.4. Memory-mapped arraysCreates a memory-mapped array from a file that reads the specified offset data,> without reading the entire file into memory by Memmap ():FileNa

valueLinalg.eigvals ()Returns the characteristic value of aLinalg.eig (A)Returns the eigenvalues and eigenvectors of a, for example (eval, Evec) = Linalg.eig (a), where the diagonal element of eval is the individual eigenvalues of a, and Evec corresponds to each column as the corresponding eigenvector.1>>> A = Array ([[ -1,1], 0],2[ -4,3, 0],3[1,0,2]])4>>> eval, Evec =Linalg.eig (a)5>>>Eval6Array ([2., 1., 1.])7>>>Evec8Array ([[0]. , 0.40824829, 0.40824829],9[0., 0.81649658, 0.81649658],Ten[1.,

In the process of learning KNN classification algorithm using the tile function, there are many do not understand, recorded the use of this function.Function prototype: Numpy.tile (a,reps) #简单理解是此函数将A进行重复输出Where a and reps are parameters of array_like, a can be: Array,list,tuple,dict,matrix and basic data type int,string,float and bool type, reps type can be tuple,list , Dict,array,int,bool, but cannot be a float,string,matrix type.There are two kinds

1. What is NumPy Machine learning is commonly used in a scientific computing library called NumPy: NumPy is an array of matrices. is a multidimensional array object, called Ndarray. Such as: Import NumPy a = Numpy.array ([[[[1,2,3,4], [5,6,7,8], [1,3,5,7]]) print (a) print (A.ndim) Print (a.shape) print (a.size) print (a.dtype) print ( a.itemsize)It is important to note that all elements in the same NumPy array must

package, Python has access to Windows COM services and other Windows APIs. Use the Ironpython,python program to directly invoke the. Net Framework. In general, the system management scripts written by Python are superior to normal shell scripts in terms of readability, performance, code reuse, and extensibility. Scientific calculationsNumpy,scipy,matplotlib al

Python learning-Introduction to python and introduction to python I. Brief Introduction to python Guido van rosum, founder of python ).

1.python Introduction: What kind of language is Python, Introduction to the basic features of PythonPython is a powerful, object-oriented dynamic, strong type, interpreted high-level programming language, is also a glue language, it has a cross-platform, robust, easy to learn and easy to use and other characteristics.T

Introduction to Python Interactive Programming-Introduction to event-driven programming and python Traditional programming adopts the following linear model: Start ---> code block A ---> code block B ---> code block C ---> code block D ---> ...... ---> end Each code block contains code that completes various things, bu

servers), and provides a variety of tools that are widely used to write high-performance server software. GameMany games use C + + to write high-performance modules such as graphical display, while using Python or Lua to write game logic, servers. Compared to Python,lua, the functionality is simpler and smaller, while Pyth