for i in range(0,-1):
print('nihao') #不会被执行,因为(0,-1)
for i in range(0,0):
print('nihao') #不会被执行
for i in range(0,1):
print('nihao') #你好
for i in range(0,-1):
print('nihao') #不会被执行,因为(0,-1)
for i in range(0,0):
print('nihao') #不会被执行
for i in range(0,1):
print('nihao') #你好