1. if基本语句
if 条件:
内部代码块
else:
.. . .. . .
print(“........”)
if 1 == 1 :
print(“a会所”)
print(“b会所”)
else:
print(“c会所”)
2. if 支持嵌套
if 1 == 1:
if 2 == 2:
print(“a会所”)
print(“b会所”)
else:
print:(“c会所”)
3.if elif (elif=else if)
inp =input(“请输入会员等级:”)
if inp ==‘高级会员’:
print (“1”)
elif inp ==“白金会员”:
print(“2”)
elif inp ==“铂金会员”
print (“3”)
else:(“4”)
print(“正在加载中”)
补充:pass(代表:当条件成立后不做任何操作,代指空代码,无意义,仅仅用于表示代码块)
if 1 == 1
pass
else:
print(“0.0”)
字符窜 (引号):
name = “alex”
name = “我是IIS”
.. .....
字符窜中 含有加法:
n1 = “alex”
n2 = “sb”
n3 = n1 + n2
print (n3)
alexsb
字符窜中 含有乘法 :
n1 =“alex”
n2 = n1 * 10
print(n2)
alexalexalexalexalexalexalexalexalexalex
数字:
age = 16 (没有引号)
加:
a1 = 10
a2 = 20
a3 = a1 + a2
减:
a3 = a1 - a2
乘:
a3 = a1 * a2
除:
a3 = a1 / a2
特殊法:
a3 = 4 ** 4
a3 = 39 % 8 #获得39除以8的余数
a = 13
temp = a % 2
if tmp == 0:
print(“偶数”)
else:
print (“奇数”)
while 的用法
import count
count = 0
while count < 10:
print(count)
# count = 100
count = count + 1
print(123)
练习: 1.使用while循环输入1 2 3 4 5 6 8 9 10
n = 1
while n < 11:
if n =7:
pass
else:
print(n)
n = n + 1
print (“----end----”)
2.求1-100的所有数的和
n = 1
s = 0
while n < 101:
print(n)
n = n + 1
s = s + n
print(s)
3.求1-100内所有的奇数
n = 1
while n < 101:
temp = n % 2
if temp ==0
pass
else:
print(n)
n = n + 1
print (“----end----”)
4.输出1-100内所有偶数
n = 1
while n < 101:
temp = n % 2
if temp !=0
pass
else:
print(n)
n = n + 1
print (“----end----”)
5.求1 - 2 + 3 - 4 + 5 . . . 99 的所有数的和
n = 1
s = 0 #s 是之前所有数的总和
while n < 100:
temp = n %2
if temp == 0:
s = s - n
else:
s = s + n
n = n + 1
print(s)
6.用户登录(三次机会重试)