Python rewrite C language program 100 example -- Part8

''' [Program 61] Question: print out the Yang Hui triangle (10 rows required for printing) 1. program Analysis: ''' if _ name _ = '_ main _': a = [] for I in range (10):. append ([]) for j in range (10): a [I]. append (0) for I in range (10): a [I] [0] = 1 a [I] [I] = 1 for I in range (2, 10 ): for j in range (1, I ): a [I] [j] = a [I-1] [J-1] + a [I-1] [j] from sys import stdout for I in range (10 ): for j in range (I + 1): stdout. write (a [I] [j]) stdout. write ('') print

'''Question: draw an elliptical ellipse 1. program Analysis: 2. program source code: ''' if _ name _ = '_ main __': from Tkinter import * x = 360 y = 160 top = y-30 bottom = y-30 canvas = Canvas (width = 400, height = 600, bg = 'white ') for I in range (20): canvas. create_oval (250-top, 250-bottom, 250 + top, 250 + bottom) top-= 5 bottom + = 5 canvas. pack () mainloop ()

'''Question: Use ellipse and rectangle to draw a picture. 1. program Analysis: 2. program source code: '''if _ name _ = '_ main _': from Tkinter import * canvas = Canvas (width = 400, height = 600, bg = 'white') left = 20 right = 50 top = 50 num = 15 for I in range (num): canvas. create_oval (250-right, 250-left, 250 + right, 250 + left) canvas. create_oval (250-20,250-top, 250 + 20,250 + top) canvas. create_rectangle (20-2 * I, 20-2 * I, 10 * (I + 2), 10 * (I + 2 )) right + = 5 left + = 5 top + = 10 canvas. pack () mainloop ()

''' [Program 65]: an optimal pattern. 1. program Analysis: 2. program source code: ''' import mathclass PTS: def _ init _ (self): self. x = 0 self. y = 0 points = [] def LineToDemo (): from Tkinter import * screenx = 400 screeny = 400 canvas = Canvas (width = screenx, height = screeny, bg = 'white ') aspectRatio = 0.85 MAXPTS = 15 h = screeny w = screenx xcenter = w/2 ycenter = h/2 radius = (h-30)/(AspectRatio * 2) -20 step = 360/MAXPTS angle = 0.0 for I in range (MAXPTS): rads = angle * math. pig/180.0 p = PTS () p. x = xcenter + int (math. cos (rads) * radius) p. y = ycenter-int (math. sin (rads) * radius * AspectRatio) angle + = step points. append (p) canvas. create_oval (xcenter-radius, ycenter-radius, xcenter + radius, ycenter + radius) for I in range (MAXPTS): for j in range (I, MAXPTS): canvas. create_line (points [I]. x, points [I]. y, points [j]. x, points [j]. y) canvas. pack () mainloop () if _ name _ = '_ main _': LineToDemo ()

''' [Program 66] Question: Enter 3 numbers a, B, c, and output in order of size. 1. Program Analysis: Use the pointer method. 2. program source code: ''' if _ name _ = '_ main _': n1 = int (raw_input ('n1 =: \ n ')) n2 = int (raw_input ('n2 =: \ n') n3 = int (raw_input ('n3 =: \ n') def swap (p1, p2 ): return p2, p1 if n1> n2: n1, n2 = swap (n1, n2) if n1> n3: n1, n3 = swap (n1, n3) if n2> n3: n2, n3 = swap (n2, n3) print n1, n2, n3

'''Question: Input array. The largest one is exchanged with the first element, the smallest one is exchanged with the last element, and the output array. 1. program analysis: the answer in Tan haoqiang's book is problematic. 2. program source code: ''' def 6B (numbers): for I in range (9): numbers. append (int (raw_input ('input a number: \ n') numbers. append (int (raw_input ('input a number: \ n') p = 0def max_min (array): max = min = 0 for I in range (1, len (array)-1): p = I if array [p]> array [max]: max = p elif array [p] <array [min]: min = p k = max l = min array [0], array [l] = array [l], array [0] array [9], array [k] = array [k], array [9] def outp (numbers): for I in range (len (numbers )): print numbers [I] if _ name _ = '_ main _': array = [] Indium (array) max_min (array) outp (array)

''' [Program 68] Question: There are n integers, so that the numbers in the front are shifted to the back m positions, and the last m number is changed to the front m number 1. program Analysis: 2. program source code: ''' if _ name _ = '_ main _': n = int (raw_input ('the total number is: \ n ')) m = int (raw_input ('back m: \ n') def move (array, n, m ): array_end = array [n-1] for I in range (n-1,-1,-1 ): array [I] = array [I-1] array [0] = array_end m-= 1 if m> 0: move (array, n, m) number = [] for I in range (n): number. append (int (raw_input ('input a number: \ n') print 'originnumber: ', number move (number, n, m) print 'after moved :', number

''' [Program 69] Question: There are n people in a circle with sequential troubleshooting. When the first person reports the number (from 1 to 3), the person who reports the number 3 leaves the circle and asks the last person who left the number. 1. program Analysis: 2. program source code: ''' if _ name _ = '_ main _': nmax = 50 n = int (raw_input ('Please input the total of numbers: ') num = [] for I in range (n): num. append (I + 1) I = 0 k = 0 m = 0 while m <n-1: if num [I]! = 0: k + = 1 if k = 3: num [I] = 0 k = 0 m + = 0 I + = 1 if I = n: I = 0 I = 0 while num [I] = 0: I + = 1 print num [I]

'''Question: Write a function, calculate the length of a string, input a string in the main function, and output its length. 1. program Analysis: 2. the program source code is as follows: '''if _ name _ = '_ main _': s = raw_input ('Please input a string: \ n ') print 'the string has % d characters. '% len (s)