通过Python示例了解切片符号
使用切片符号的语法
object[begin:end] #从begin开始，在end-1结束
object[end:] #从开始开始，其余的项目
object[:stop] #从0开始，在第1结束处停止
object[:] #返回整个数组的副本
object[begin:end:step] #从begin开始，在end-1结束 with given step理解切片符号的Python程序
x = [10, 20, 30, 40, 50] #list
y = (10, 20, 30, 40, 50) #元组
z = "https://www.nhooo.com/" #字符串
print("x =", x)
print("y =", y)
print("z =", z)print()print("x[0:5] =", x[0:5])
print("x[0:4] =", x[0:4])
print("x[2:5] =", x[2:5])
print("x[0:] =", x[0:])
print("x[:5] =", x[:5])
print("x[:3] =", x[:3])
print("x[0:5:2] =", x[0:5:2])print()print("y[0:5] =", y[0:5])
print("y[0:4] =", y[0:4])
print("y[2:5] =", y[2:5])
print("y[0:] =", y[0:])
print("y[:5] =", y[:5])
print("y[:3] =", y[:3])
print("y[0:5:2] =", y[0:5:2])print()print("z[0:5] =", z[0:5])
print("z[0:4] =", z[0:4])
print("z[2:5] =", z[2:5])
print("z[0:] =", z[0:])
print("z[:5] =", z[:5])
print("z[:3] =", z[:3])
print("z[0:5:2] =", z[0:5:2])print()输出结果
x = [10, 20, 30, 40, 50] y = (10, 20, 30, 40, 50) z = https://www.nhooo.com/ x[0:5] = [10, 20, 30, 40, 50] x[0:4] = [10, 20, 30, 40] x[2:5] = [30, 40, 50] x[0:] = [10, 20, 30, 40, 50] x[:5] = [10, 20, 30, 40, 50] x[:3] = [10, 20, 30] x[0:5:2] = [10, 30, 50] y[0:5] = (10, 20, 30, 40, 50) y[0:4] = (10, 20, 30, 40) y[2:5] = (30, 40, 50) y[0:] = (10, 20, 30, 40, 50) y[:5] = (10, 20, 30, 40, 50) y[:3] = (10, 20, 30) y[0:5:2] = (10, 30, 50) z[0:5] = https z[0:4] = http z[2:5] = tps z[0:] = https://www.nhooo.com/ z[:5] = https z[:3] = htt z[0:5:2] = hts