[Python知识库]Python分别用列表和数组实现成绩计算

分别用列表（list）和数组（ndarray）实现：

? ? ? ? （1）每位同学的总分，平均分；

? ? ? ? （2）每门课程的平均分，单科最高分，方差；

? ? ? ? （3）每位同学获得的绩点；

? ? ? ? （4）依据奖学金标准，判定该生能申请几等奖学金；

• 用列表实现

list = [['姓名','数分','高代','概率论','数理统计'],
        ['张三','78','90','65','76'],
        ['李四','89','84','90','82'],
        ['王五','72','64','58','70'],
        ['赵六','94','88','79','78'],
        ['钱七','74','80','86','90']]
listheight = len(list)#得到列表行数
listwidth = len(list[0])#得到列表列数

print("\n(1)、(3)、(4）")
sumc = [0 for r in range(listheight)]#造一个空列表存数据
for i in range(1,listheight):
    credit = 0
    minc = 100
    for j in range(1,listwidth):
        sumc[i] = sumc[i] + eval(list[i][j])#计算单人总成绩
        if eval(list[i][j]) < minc :minc = eval(list[i][j])#求单人最低成绩
        #计算绩点
        if eval(list[i][j]) > 90: credit = credit + 4;continue
        if eval(list[i][j]) > 85: credit = credit + 3.7;continue
        if eval(list[i][j]) > 82: credit = credit + 3.3;continue
        if eval(list[i][j]) > 78: credit = credit + 3.0;continue
        if eval(list[i][j]) > 75: credit = credit + 2.7;continue
        if eval(list[i][j]) > 72: credit = credit + 2.3;continue
        if eval(list[i][j]) > 68: credit = credit + 2.0;continue
        if eval(list[i][j]) > 64: credit = credit + 1.5;continue
        if eval(list[i][j]) > 60: credit = credit + 1;continue
    print("{}的总成绩是：{}，平均分是：{:.4}，绩点是:{:.2f}".format(list[i][0],sumc[i],sumc[i]/(listwidth-1),credit/(listwidth-1)),end="")
    #判断申请的奖学金
    if minc > 85:print(" 可以申请特等优秀学生奖学金\n")
    elif minc > 80:print("，可以申请甲等优秀学生奖学金\n")
    elif minc > 75:print("，可以申请乙等优秀学生奖学金\n")
    elif minc > 70:print("，可以申请丙等优秀学生奖学金\n")
    else:print("\n")

print("\n(2)")
for x in range(1,listwidth):
    total = 0
    maxc = 0
    dnp = 0
    for y in range(1,listheight):
        if eval(list[y][x]) > maxc : maxc = eval(list[y][x]) #比较得出最高分
        total = eval(list[y][x]) + total#计算单科累计分数
    average = total / (listheight-1)#计算平均分
    
    for z in range(1,listheight):#计算方差
        dnp = dnp + (eval(list[z][x])-average)**2
    Dnp = dnp/(listheight-1)
    print("{}的平均分是{:.4},最高分是{}，方差是{:.2f}\n".format(list[0][x],average,maxc,Dnp))

• 用数组实现

  import numpy as np
  data = [['姓名','数分','高代','概率论','数理统计'],
          ['张三','78','90','65','76'],
          ['李四','89','84','90','82'],
          ['王五','72','64','58','70'],
          ['赵六','94','88','79','78'],
          ['钱七','74','80','86','90']]
  w1 = np.array(data)#创建数组
  (a,b) = w1.shape#获得w1数组的维度
  w2 = w1[1:a,1:b].astype(int)#提取数组data内的数据并转整形
  
  w2add1 = np.sum(w2,axis = 1)#数组w2横轴的和：学生总成绩
  w2average1 = np.mean(w2,axis = 1)#数组w2横轴的均值：学生平均分
  w2average0 = np.mean(w2,axis = 0)#数组w2纵轴的均值：单科平均分
  w2var0 = np.var(w2,axis = 0)#数组w2纵轴的方差：单科方差
  w2max0 = w2.copy()
  w2max0.sort(axis = 0)#w2数组纵向升序排序后的数组：单科最高分
  w2max1 = w2.copy()
  w2max1.sort(axis = 1)#w2数组横向升序排序后的数组：学生最低分
  #计算绩点
  w3 = np.array([])
  for i in range(a-1):
      credit = 0
      for j in range(b-1):
          if w2[i,j] > 90: credit = credit + 4;continue
          if w2[i,j] > 85: credit = credit + 3.7;continue
          if w2[i,j] > 82: credit = credit + 3.3;continue
          if w2[i,j] > 78: credit = credit + 3.0;continue
          if w2[i,j] > 75: credit = credit + 2.7;continue
          if w2[i,j] > 72: credit = credit + 2.3;continue
          if w2[i,j] > 68: credit = credit + 2.0;continue
          if w2[i,j] > 64: credit = credit + 1.5;continue
          if w2[i,j] > 60: credit = credit + 1;continue
      w3 = np.append(w3,credit/(b-1))
  print("(1)、(3)、(4)") 
  for x in range(0,a-1):
      print("{}的总成绩是：{}，平均分是：{:.4}，绩点是:{:.2f}".format(w1[x+1,0],w2add1[x],w2average1[x],w3[x]),end="")
      #判断申请的奖学金
      if w2max1[x,0] > 85:print(" 可以申请特等优秀学生奖学金\n")
      elif w2max1[x,0] > 80:print("，可以申请甲等优秀学生奖学金\n")
      elif w2max1[x,0] > 75:print("，可以申请乙等优秀学生奖学金\n")
      elif w2max1[x,0] > 70:print("，可以申请丙等优秀学生奖学金\n")
      else:print("\n")
  print("(2)")
  for y in range(0,b-1):#计算方差
      print("{}的平均分是{:.4},最高分是{}，方差是{:.2f}\n".format(w1[0,y+1],w2average0[y],w2max0[a-2,y],w2var0[y]))
  

  以上是我的一点学习笔记。