控制语句

一、条件判断

age = 2
if age < 0:
    print("你是在逗我吧!")
elif age == 1:
    print("相当于 14 岁的人。")
elif age == 2:
    print("相当于 22 岁的人。")
elif age > 2:
    human = 22 + (age -2)*5
    print("对应人类年龄: ", human)

二、for循环

sites = ["Baidu", "Google","Runoob","Taobao"]
for site in sites:
    if site == "Google":
        print("谷歌!")
        break   # 跳出循环，可以使用 break 跳出循环
    print("循环数据 " + site)
else:
    print("没有循环数据!")
print("完成循环!")

三、while循环

count = 0
while count < 5:
   print (count, " 小于 5")
   count = count + 1
else:
   print (count, " 大于或等于 5")

四、range()函数生成数列

for i in range(0, 10, 3) : # 指定步长
    print(i)
a = ['Google', 'Baidu', 'Runoob', 'Taobao', 'QQ']
for i in range(len(a)):
    print(i, a[i])

五、本节demo运算结果：