#!/usr/bin/env python
# Robin
b = 0
while True:#while循环
print(b)
b += 1
if b == 30:
break
for i in range(0,10,2):#for循环(从0循环到10 步进2)
print(i)
#!/usr/bin/env python
# Robin
b = 0
while True:#while循环
print(b)
b += 1
if b == 30:
break
for i in range(0,10,2):#for循环(从0循环到10 步进2)
print(i)