切片能应用于list和字符串
切片取值的时候取头不取尾，所填取尾的位置不会取
names= [“王帅”, “王瑞”, “陈雪”, “张齐”, “赵琴”]
print(names[0:3])
print(names[:3])
print(names[2:])
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最后可以填写步长，步长正数从前往后取,步长负数从后往前取,前边填下标的话需要填负数
numbers = list(range(1, 11))
# [start:end:step]
print(numbers)
print(numbers[0:11:2])
print(numbers[-6:-10:-1])

1 2 3 4 5
s = “hdasdhad”
print(s[:3])

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