":
print("222")
elif inp == "3":
print("333")
else:
print("...")
if name == "alex" or name == "eric"
只要满足任何一个or条件进入当前代码块
1.
if条件：
代码块
else：
代码块
2.
if条件：
代码块
elif条件:
代码块
else:
代码块
3.条件
Ture False
1>2 n1>n2 n1 == n2
name == "alex" or name == "eric"
name 1 == "alex"
name == "alex" and pwd == "123"
while 代码块：
代码块
import time
n1 = Ture
while n1:
print("1")
time.sleep(1)
n1 = False
print("end')
______________________________________________________________________________________
例：
kaishi = 1
while Ture:
print(kaishi)
kaishi = kaishi+1
time.sleep(1)
###打印（1）
———————————————————————————————————————
break
用于跳出当前循环，并且break下面的代码，将不再执行
例：
kaishi = 1
while Ture:
print(kaishi)
if kaishi == 10:
break
kaishi = kaishi+1
_____________________________________________________________________________________________
continue
用于跳出本次循环，继续下一次循环
while True:
print("123")
break
print("456")
###打印（123）
while Ture:
print("123")
continue
print("456")
###打印（123）
———————————————————————————————————————————
例：
1.输入1-10整数
start = 1
while Ture:
print(start)
if start == 10:
break
start+= 1
2.输入除7以外的1-10所有正整数
start = 1
while Ture:
if start == 7:
start += 1
continue
print(start)
if start == 10:
break
start += 1
3.输入1-100以内所有整数
start = 1
while Ture:
print(start)
if start == 100:
break
start += 1
4.求1-100内所有整数合
sum = 0
start = 1
while Ture:
sum = sum + start
if start == 100:
break
start += 1
print(sum)
5.输出1-100内所有奇数
start = 1
while start < 101:
temp = start%2
if temp == 1:
print(start)
else:
pass
start += 1
###temp是余数
6.输出1-100内所有偶数
start = 1
while start < 101: