import pandas as pd import numpy as np Step 1.加载数据集 # header=0以第一行作为列名 tip = pd.read_csv("lianx.csv",sep=',',header=0) tip.head() Step 2.删除第 1,4,7,9,11,13,14列,保存修改 a = list(tip.columns) print(a) b = [] c = 0 for i in a: c= c+1 if c in [1,4,7,9,1
K-th Number Time Limit: 20000MS Memory Limit: 65536K Total Submissions: 47066 Accepted: 15743 Case Time Limit: 2000MS Description You are working for Macrohard company in data structures department. After failing your previous task about key inse
1 运算符 1.1 比较运算符 比较运算符的结果都是boolean类型,也即是要么是true,要么是false. 比较运算符"=="不能写成"=". > package java003; /** * 2017/8/31. * 说明: */ public class OperateDemo { public static void main(String[] args) { int a = 3; int b = 7; System.out.print(a>