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<input id="form:bkg_num" name="form:bkg_num" type="text" value="" maxlength="35" size="20" style="font-size: 16px"> <input id="form:bkg_num" name="for 阅读全文
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1. 关于has , is. class Person(object): def __init__(self, name): ## has name self.name = name ## Person has-a pet of some kind self.pet = None class Emp 阅读全文
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WITH的使用 WITH t1 AS (SELECT r.name region_name, SUM(o.total_amt_usd) total_amtFROM sales_reps sJOIN accounts aON a.sales_rep_id = s.idJOIN orders oON o 阅读全文
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cv2.imread cv2.threshold cv2.imwrite plt.imshow cv2.getStructuringElement cv2.erode cv2.dilate cv2.addWeighted cv2.bitwise_xor cv2.bitwise_not cv2.fin 阅读全文
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Beyond the Basic Stuff with Python Introduction Chapter 1 - Dealing with Errors and Asking for Help Chapter 2 - Environment Setup and the Command Line 阅读全文
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12.样本和总体：sample and population Sample mean： χ (n) Population mean:μ (N) 均差 13.总体方差：Population variance ：σ2 Population mean:μ (n) 数的和/N σ2= 数与均值距离2的和/N 阅读全文
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Navigation find permission denied http://www.codecoffee.com/tipsforlinux/articles/21.html https://www.computerhope.com/unix/ufind.htm making cd mkdir 阅读全文
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vi http://www.cs.colostate.edu/helpdocs/vi.html 查找： 退出： 删除： * 复制粘贴： 阅读全文