一.序列和索引 1.1 用索引检索字符串中的元素 # 正向递增
shelloworld
for i in range (0,len(s)):# i是索引print(i,s[i],end\t\t)
print(\n--------------------------)
# 反向递减
for i in range (-10,0):print(i,s[i],end\t\t)print(\n--------------------------)
print(…
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深度理解 TSS(总平方和):公式、意义与应用
在机器学习与统计建模领域,评价模型好坏的重要指标之一就是方差与误差分析。其中,TSS(Total Sum of Squares,总平方和)扮演着非常关键的角…