代码: 全选
a = "Hello World!"
print(a[::-1])
"""
!dlroW olleH
"""
- “开始”默认为 0
- “stop”默认为序列的长度
- 如果未指定“step”,则默认为 1。
2 就地交换/同时分配
代码: 全选
a = 10
b = 5
print(f"First: {a, b}")
"""
First: (10, 5)
"""
a, b = b, a + 2
print(f"Second: {a, b}")
"""
Second: (5, 12)
"""
代码: 全选
import sys
a = [1, 2, 3, 4, 5]
b = (1, 2, 3, 4, 5)
print(f"List size: {sys.getsizeof(a)} bytes")
print(f"Tuple size: {sys.getsizeof(b)} bytes")
"""
List size: 112 bytes
Tuple size: 96 bytes
"""
代码: 全选
a = [1,2,3,4,5]
a[2] = 8
print(a)
"""
[1,2,8,4,5]
"""