import os import platform import sys from PyQt5.QtCore import * from PyQt5.QtGui import * from PyQt5.QtWidgets import * import numpy as np import matplotlib matplotlib.use("Qt5Agg") from matplotlib.backends.backend_qt5agg import FigureCanvasQTAg
菱形继承问题样例: #include <iostream> using namespace std; class A { public: ; virtual int getx() { return x; } }; class B:public A{}; class C:public A{}; class D:public B,public C{}; int main() { D d; //以下代码不会被任何编译器通过,因为存在菱形继承问题:不知道是调用B的getx函数,还是调用C的getx函数
通过plt.subplot能够在一张图中画出多个子图 #coding: utf-8 #!/usr/bin/env python """ Draw a graph with matplotlib. You must have matplotlib for this to work. """ __author__ = """Aric Hagberg (hagberg@lanl.gov)"""
在屏幕上打印类似下面的图形: 常规画正方形的算法: 这几乎是初学所有计算机语言时都会遇到的问题.算法都大致类似,就是找出打印规律然后用计算机语句表达出来.最常规的算法是:输入数字n就打印n行,首行和尾行打印n个*号,其它行中打印收尾*号,其他位置打印空格.实现如下: s=int(input("num:")) for i in range(s): #Count.Record how many times you enter. if i == 0 or i == s-1: #If i is