归档 2015年12月

在存储或者传输图像时，我们经常需要将图像转换成字符串。

与其他编程语言一样（比如Java），Python也可以实现将图像用字符串进行表示。

使用Python进行转换非常的简单，关键部分就是使用“base64”模块，它提供了标准的数据编码解码方法。

图像转换成字符串

Python代码：

import base64
 
with open("t.png", "rb") as imageFile:
    str = base64.b64encode(imageFile.read())
    print str

输出：

iVBORw0KGgoAAAANSUhEUgAAAuAAAACFCAIAAACVGtqeAAAAA3
NCSVQICAjb4U/gAAAAGXRFWHRTb2Z0d2FyZQBnbm9tZS1zY3Jl
ZW5zaG907wO/PgAAIABJREFUeJzsnXc81d8fx9+fe695rYwIaa
...

字符串转换成图像

Python代码：

fh = open("imageToSave.png", "wb ...

题目描述：

Given a string array words, find the maximum value of length(word[i]) * length(word[j]) where the two words do not share common letters. You may assume that each word will contain only lower case letters. If no ...

题目描述：

Given a string which contains only lowercase letters, remove duplicate letters so that every letter appear once and only once. You must make sure your result is the smallest in lexicographical order among all possible results.

Example:

Given "bcabc" ...

代码参考：http://jsfiddle.net/amcharts/ATQUm/

JavaScript代码：

var chart;
var chartData = [];
var chartCursor;
var day = 0;
var firstDate = new Date();
firstDate.setDate(firstDate.getDate() - 500);

// generate some random data, quite different range
function generateChartData() {
    for (day = 0; day < 50 ...

题目描述：

You are given an integer array nums and you have to return a new counts array. The counts array has the property where counts[i] is the number of smaller elements to the right of nums[i].

Example:

Given ...