day_04_if...else/input/print/

猜年龄
‘‘‘
age_of_prinacl = 55       #定义校长年龄55岁
guess_age = int(input("guess_age = "))  #输入猜的年龄并转换为Int整数类型，因为Input都是字符串
if age_of_prinacl == guess_age:   #后面要带冒号
 print("恭喜你，答对了！")    #必须缩进一行tab键
elif age_of_prinacl > guess_age:   #否则如果，pyhton用elif
 print("年龄偏小")
else:          #必须带冒号
 print("年龄偏大！")      #必须缩进
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分数分类
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num = int(input("你的分数是："))
if num > 90:
 print("您的分数是A")
elif num > 80:
 print("您的分数是B")
elif num > 60:
 print("您刚及格")
else:
 print("您的分数不及格")
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#取最大数
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a = int(input("a = "))
b = int(input("b = "))
c = int(input("c = "))
if a >= b:
 tmp = a
else:
 tmp = b
if tmp >= c:
 tmp = tmp
else:
 tmp = c
print(tmp)
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取最大数

a = int(input("a = "))
b = int(input("b = "))
c = int(input("c = "))
if a > b:
 tmp = a
 if tmp > c:
  print("max_num = ",tmp)
 else:
  print("max_num = ",c)
else:
 tmp = b
 if tmp > c:
  print("max_num = ",tmp)
 else:
  print("max_num = ",c)