下图有多少个三角形？ 第1页

       #!/usr/bin/python  # total 10 dots alldots=10   # total 10 lines allines=10 # 定义所有线段 lines=[[1,2],[2,3],[3,4],[4,5],[1,5],[1,3,7,8],[2,4,8,9],[2,5,6,7],[3,5,9,10],[1,4,6,10]]  def isline(a,b):              #判断a,b 点是否在一条线     for i in range(0,allines):         if( (a in lines[i]) and (b in lines[i])) :             return 1     return 0          def isline3(a,b,c):         #判断a,b,c 是否一条线上     for i in range(0,allines):         if( (a in lines[i]) and (b in lines[i]) and (c in lines[i])) :             return 1     return 0 def istriangle(a,b,c):        # abc 三点，如果ab,bc,ac都是线段，且abc不在一条直线，就是三角形     if( isline(a,b) and isline(a,c) and isline(b,c) ):         if(isline3(a,b,c) ) :             return 0         else :             return 1     return 0 count=0 # for each 3 dots check if they are a triangle.  #遍历所有点是否三角形 for i in range(1,alldots+1) :   for j in range(i+1,alldots+1) :       for k in range(j+1,alldots+1) :           if ( istriangle(i,j,k) ) :             print(i,j,k )             count = count+1 print ("total have ",count," triangles")