print("-------1、if 语句的基本形式----")
# -*-coding:utf-8-*-

results=59

if results>=60:
    print ('及格')
else :
    print ('不及格')


print("-------2、if 语句多个判断条件的形式----")

# -*-coding:utf-8-*-

results = 89

if results > 90:
    print('优秀')
elif results > 80:
    print('良好')
elif results > 60:
    print ('及格')
else :
    print ('不及格')


print("-------3、if 语句多个条件同时判断----")
# -*-coding:utf-8-*-

java = 86
python = 68

if java > 80 and  python > 80:
    print('优秀')
else :
    print('不优秀')

if ( java >= 80  and java < 90 )  or ( python >= 80 and python < 90):
    print('良好')