#Python_Day02# if条件判断语句 while循环语句

 

1.字符串格式化

name = input("name:")
age = input("age:")
job = input("job:")
hometown = input("hometown:")

# 字符串格式化的时候,在%后面只能加一个字符,多加的Python不会对其进行替换
# %s 表示需要填入字符串类型的变量(string)
# %d 表示需要填入数字类型的变量(digit)
# %f 表示浮点数类型的变量(float)
# input()函数默认输入的是字符串
# type() 函数用来查看数据类型
# int() 转换指定数据到数字类型
# str() 转换指定数据到字符串类型

info = """
--------------- info of %s ----------------
name:               %s
age:                %s
job:                %s
hometown:           %s
----------------   end   ------------------
"""%(name,name,age,job,hometown)

print(info)

2.if语句

grade = int(input("grade: "))
if grade >= 90:
    print("A")
elif grade >=80:
    print("B")
elif grade >= 60:
    print("C")
elif grade >= 40:
    print("D")
else:
    print("E")

3.while循环语句

#最坚定的while循环
#count = 0 
#while count<100:
#    print("loop",count)
#    count += 1
#print("---------------- loop is ended --------------")

#打印1到100的偶数
#count = 1
#while count <= 100:
#    if count % 2 == 0:
#        print("loop: ",count)
#    count += 1
#print("-------------- loop is ended ----------------")

#打印1-100,第50次不打印,第60-80次,打印对应值得平方
#count = 0
#while count<=100:
#    if count == 50:
#        pass #pass 就是过
#    if count >= 60 and  count <= 80:
#        print(count*count)
#    else:    
#        print("loop: ",count)
#    count += 1
#print("-------------- loop is ended -------------")

#死循环 ,True 第一个字母必须大写,小写程序报语法错误
#count = 0
#while True:
#    print("forever 21",count)
#    count += 1

# continue 终止本次循环
#break 终止整个循环语句

#count = 0
#while count <= 100:
#    if count == 5:
#        break
#    print("loop: ",count)
#    count += 1
#print("--- loop of ended ---")

#猜年龄
age = 26
count = 1
while count<=3:
    guess_of_age = int(input("guess_of_age:"))
    if guess_of_age > age:
        print("try bigger")
    elif guess_of_age <age:
        print("try small")
    else:
        #got it 猜对了
        print("very good!you got it!")
    count += 1
    #检查是否已经满足3次,因为上面已经加过了,多以这里判断是否大于3次
    if count > 3:
        input_content = input("是否继续猜?继续请安y,否则请按n.")
        if input_content == "y":
            count = 1
        elif input_content == "n":
            print("程序退出!")
            break
        else:
            print("用户输入异常,程序即将退出!")
            break
    

4.while_else循环语句,后面的else 表示正常执行完while循环体后再执行else下的代码,这里的正常执行完是指while循环体里面没有被break强制退出

count = 0
while count <10:    
    count += 1
    print("loop: ",count)
else:
    print("loop is done......")
    
print("out of loop")