如何输出python3中的循环？

# encoding:utf-8

# Python3.6

classmates = ['刘达', '王尔', '李珊', '陈思', '张悟']

courses = ['高等数学', 'Python程序设计', '宏观经bai济学', '管理学原理']

grade1 = {'刘达': 89, '王尔': 95, '李珊': 67, '陈思': 75}

grade2 = {'刘达': 75, '王尔': 79, '李珊': 79}

grade3 = {'李珊': 87, '陈思': 91, '张悟': 75}

grade4 = {'刘达': 89, '王尔': 86, '张悟': 99}

# 格式化字符串表示，具体内容可以搜索 python formate

print("{:<6}{:^10}{:^10}{:^10}{:^10}".format("姓名\\科目", courses[0], courses[1], courses[2], courses[3]))

for i, name in enumerate(classmates):

    g1, g2, g3, g4 = "", "", "", ""

    if name in grade1:

        g1 = grade1[name]

    if name in grade2:

        g2 = grade2[name]

    if name in grade3:

        g3 = grade3[name]

    if name in grade4:

        g4 = grade4[name]

print("{:^6}{:^18}{:^10}{:^18}{:^18}".format(name, g1, g2, g3, g4))