python --条件判断和语句控制

a,b = 0,1
while b < 1000:
    print(b,end = ‘‘)
    a,b = b,a+b

#!/usr/bin/python3
var = 1
while var == 1 :  # 表达式永远为 true
   num = int(input("输入一个数字  :"))
   print ("你输入的数字是: ", num)
print ("Good bye!")

#!/usr/bin/python3
count = 0
while count < 5:
   print (count, " 小于 5")
   count = count + 1
else:
   print (count, " 大于或等于 5")

#!/usr/bin/python
flag = 1
while (flag): print (‘欢迎!‘)

if a<1 :
    print(1)
elif a =1:
    print(2)
else :
    print(3)

for <variable> in <sequence>:
    <statements>
else:
    <statements>