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L = ['GuanYu', 'ZhangFei', 'ZhaoYun', 'MaChao', 'HuangZhong'] # get the first 3 elements # ['GuanYu', 'ZhangFei', 'ZhaoYun'] print(L[0:3]) # ['GuanYu', 'ZhangFei', 'ZhaoYun'] print(L[:3]) # get the last 2 elements # ['MaChao', 'HuangZhong'] print(L[-2:]) # ['MaChao'] print(L[-2:-1])
Console Output
Python支持L[-1]取倒数第一个元素, 记住倒数第一个元素的索引是-1
L = list(range(100)) # get the first 10 elements print(L[:10]) # get the last 10 elements print(L[-10:]) # get 11 - 20 elements print(L[10:20]) # 前10个数,每2个取一个 # [0, 2, 4, 6, 8] print(L[:10:2]) # 所有数,每5个取一个 # [0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95] print(L[::5]) # 只写[:]就可以原样复制一个list print(L[:])
Console Output
tuple也是一种list,唯一区别是tuple不可变
t = (0, 1, 2, 3, 4, 5)[:3] # (0, 1, 2) print(t)
字符串'xxx'也可以看成是一种list,每个元素就是一个字符
str1 = 'ABCDEFG'[:3] # ABC print(str1) # ACEG str2 = 'ABCDEFG'[::2] print(str2)
Console Output
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