python2.7中,for循环语句的强大可以通过下列案例看出,你可能很少见到这样的使用方式:
''' Algorithm for Python ''' import random import datetime ranArray = [] ranArray = [x for x in range(100000)] tStart = datetime.datetime.now() tEnd = datetime.datetime.now() def swapsort(): random.shuffle(ranArray) arr = ranArray length = len(arr) start() for i in range(length): for j in range(i+1,length): if arr[i] > arr[j]: tem = arr[i] arr[i] = arr[j] arr[j] = tem print "Swap sort end." end() def mutrixmult(): a = [[1,2],[2,3]] b = [[7,22],[22,33]] c = [[0 for x in range(a)] for x in range(b)] for i in range(len(a)-1): for j in range(len(a[0]-1)): for m in range(b[0]-1): c[i][j] = a[i][j] * b[i][m] +a[i][j+1] * b[i][m+1] def start(): tStart = datetime.datetime.now() def end(): tEnd = datetime.datetime.now() print "Cost",tEnd - tStart if __name__ == "__main__": #swapsort() mutrixmult()
