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全部文章（共226篇）

基本Turtle语句

import turtle turtle.showturtle() turtle.write("Welcome to Python") turtle.forward(100) turtle.backward(100) turtle.color('red') turtle.penu...

2020-07-14

0 392

Simple Python Built-in Functions

>>>ord('a') - ord('A') 32 >>>chr(98) 'b' #chr(code ) function return the character represent by the code >>> str(98...

2020-07-14

0 459

one simple example of yield

Write a generator that returns every arrangement of items such that each is in one or none of two different bags. Each combination should be given as...

2020-07-14

0 373

Alphabetical Substrings

Assume s is a string of lower case characters. Write a program that prints the longest substring of s in which the letters occur in alphabetical orde...

2020-07-14

0 312

Counting bobs

Assume s is a string of lower case characters. Write a program that prints the number of times the string 'bob' occurs in s. For example, if s = 'a...

2020-07-14

0 402

Alphabetical Substrings

Assume s is a string of lower case characters. Write a program that prints the longest substring of s in which the letters occur in alphabetical orde...

2020-07-14

0 383

a simple example of trade-off from fibonacci function to fast-fibonacci function

#old recursive fib function def fib(n): if n == 0: return 1 elif n == 1: return 1 else: return fib(n-1)+fib(n-2) p...

2020-07-14

0 385

homework of numerical solution of PDEs

Problem set find the numerical solution of the following partial differential equation: 1.C - N Scheme %二阶波动方程的CN格式 A=[0,-1;-1,0;]; I=[1,0;0,...

2020-07-14

0 524

Example: solving ODE using FEM method

clc; clear; % find the solution of du/dt -1 =0 Using finite element method % the zone of solution is [0,1] E = 5; % the number of elements N = E+1; %...

2020-07-14

0 358

double_linked_list in Python

class Frob(object): def __init__(self, name): self.name = name self.before = None self.after = None def setBefore(self...

2020-07-14

0 356