Init

MultiProcess.py

@@ -0,0 +1,31 @@
+#!/usr/bin/env python
+# -*- coding:utf-8 -*- 
+
+#mulitprocessing is the module for IPC communication.
+import multiprocessing
+from multiprocessing import Process, Queue
+import os, time, random
+
+def write(q):
+	print('Process to write:%s' %os.getpid())
+	for value in ['a', 'b', 'c']:
+		print('Put %s in queue' %value)
+		q.put(value)
+		time.sleep(random.random())
+
+def read(q):
+	print('Process to read:%s' %os.getpid())
+	while True:
+		value = q.get(True)
+		print('Get %s from queue.' %value)
+
+if __name__ == '__main__':
+	#Print how may cores we have in this computer.
+	print('This computer has %s cores' %multiprocessing.cpu_count())
+	q = Queue()
+	pw = Process(target = write, args = (q,))
+	pr = Process(target = read, args = (q,))
+	pw.start()
+	pr.start()
+	pw.join()
+	pr.terminate()

Threads.py

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+#!/usr/bin/env python
+# -*- coding:utf-8 -*- 
+
+import threading, time
+
+#The balance variable.
+balance = 0
+#Add lock for more than one threads to access the global resource.
+lock = threading.Lock()
+
+def loop():
+	print('thread %s is running...' %threading.current_thread().name)
+	n = 0
+	while n < 5:
+		print('thread %s >>> %s' %(threading.current_thread().name, n))
+		time.sleep(1)
+		n = n + 1
+	print('thread %s end.' %threading.current_thread().name)
+
+def change_it(n):
+	global balance
+	balance = balance + n
+	balance = balance - n
+
+def run_thread(n):
+	for i in range(100):
+		#Before changing the global resource, we try to get the lock for this resource.
+		lock.acquire()
+		try:
+			change_it(n)
+		finally:
+			lock.release()
+
+if __name__ == '__main__':
+	print('thread %s is running...' %threading.current_thread().name)
+	'''
+	t = threading.Thread(target = loop, name = 'LoopThread')
+	t.start()
+	t.join()
+	print('thread %s end.' %threading.current_thread().name)
+	'''
+	t1 = threading.Thread(target = run_thread, args = (5,))
+	t2 = threading.Thread(target = run_thread, args = (10,))
+	t1.start()
+	t2.start()
+	t1.join()
+	t2.join()
+	print(balance)

class.py

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+#!/usr/bin/env python
+# -*- coding:utf-8 -*- 
+
+import sys
+import os
+
+class Student(object):
+	'''The student class'''
+
+	def __init__(self, name, score):
+		self.name = name
+		self.score = score
+
+	def print_score(self):
+		print('%s: %s' %(self.name, self.score))
+
+class University_Student(Student):
+	'''The University_Student based on the Student class'''
+	pass
+
+if __name__ == "__main__":
+	'''The bleow segment is example of os.fork.'''
+	print('Process %s start' %os.getpid())
+	pid = os.fork()
+	if pid == 0:
+		print('I am the child process (%s) and my parent process is %s' %(os.getpid(), os.getppid()))
+	else:
+		print('I (%s) just created a child process(%s)' %(os.getpid(), pid))
+	theo = Student('Theo', 90)
+	theo.print_score()
+
+	emma = Student('Emma', 98)
+	emma.print_score()

house.py

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+#!/usr/bin/env python
+# -*- coding:utf-8 -*- 
+# This codes are for house trade infomation.
+
+# -*- coding:utf-8 -*-
+
+import requests
+import re
+import sys, os
+
+
+print(u'''每个区对应代码如下：
+0：显示上海所有区单独的平均房价；
+1：浦东新区；
+2：闵行区；
+3：徐汇区；
+4：长宁区；
+5：普陀区；
+6：静安区；
+7：卢湾区；
+8：黄浦区；
+9：闸北区；
+a：虹口区；
+b：杨浦区；
+c：宝山区；
+d：嘉定区；
+e：青浦区；
+f：松江区；
+g：金山区；
+h：奉贤区；
+i：南汇区；
+j：崇明区；
+k：上海周边；
+''')
+
+#各地区页面代码
+num_area = {
+    '1':'http://wap.ganji.com/sh/fang5/pudongxinqu/o',
+    '2':'http://wap.ganji.com/sh/fang5/minhang/o',
+    '3':'http://wap.ganji.com/sh/fang5/xuhui/o',
+    '4':'http://wap.ganji.com/sh/fang5/changning/o',
+    '5':'http://wap.ganji.com/sh/fang5/putuo/o',
+    '6':'http://wap.ganji.com/sh/fang5/jingan/o',
+    '7':'http://wap.ganji.com/sh/fang5/luwan/o',
+    '8':'http://wap.ganji.com/sh/fang5/huangpu/o',
+    '9':'http://wap.ganji.com/sh/fang5/zhabei/o',
+    'a':'http://wap.ganji.com/sh/fang5/hongkou/o',
+    'b':'http://wap.ganji.com/sh/fang5/yangpu/o',
+    'c':'http://wap.ganji.com/sh/fang5/baoshan/o',
+    'd':'http://wap.ganji.com/sh/fang5/jiading/o',
+    'e':'http://wap.ganji.com/sh/fang5/qingpu/o',
+    'f':'http://wap.ganji.com/sh/fang5/songjiang/o',
+    'g':'http://wap.ganji.com/sh/fang5/jinshan/o',
+    'h':'http://wap.ganji.com/sh/fang5/fengxian/o',
+    'i':'http://wap.ganji.com/sh/fang5/nanhui/o',
+    'j':'http://wap.ganji.com/sh/fang5/chongming/o',
+    'k':'http://wap.ganji.com/sh/fang5/shanghaizhoubian/o'
+}
+
+#各地区显示代码
+area = {
+    '1':u'浦东新区',
+    '2':u'闵行区',
+    '3':u'徐汇区',
+    '4':u'长宁区',
+    '5':u'普陀区',
+    '6':u'静安区',
+    '7':u'卢湾区',
+    '8':u'黄浦区',
+    '9':u'闸北区',
+    'a':u'虹口区',
+    'b':u'杨浦区',
+    'c':u'宝山区',
+    'd':u'嘉定区',
+    'e':u'青浦区',
+    'f':u'松江区',
+    'g':u'金山区',
+    'h':u'奉贤区',
+    'i':u'南汇区',
+    'j':u'崇明区',
+    'k':u'上海周边'
+}
+
+#Get the price of each district.
+def get_price(numb):
+    sp_list = []
+    for n in range(1,50): #抓取前50页
+        url = num_area[numb]+str(n)
+        urlpage = requests.get(url)
+        urlpage.encoding = 'utf-8'
+        urltx = urlpage.text
+
+        #Save the html context for analysis.
+        with open(os.path.abspath('.') + '/projects/SampleProject/python_learn_excrise/' + str(n),'w') as f:
+        	f.write(urltx)
+
+        #Get the price from each web page.
+        size_price = re.findall(u'(\d+)\u33a1.*?(\d+)\u4e07\u5143',urltx,re.S)
+        for sp in size_price:
+            sp_list.append(sp)
+
+    priclist = []
+    sum_pric = 0
+    i = 0
+
+    #Cal the average price.
+    for sizepri in sp_list:
+        pric = round(float(sizepri[1])/float(sizepri[0]),2)      
+        #print pric
+        priclist.append(pric)
+        sum_pric = sum_pric + pric
+        i = i + 1
+
+    if i != 0:
+        print(area[numb]+u"共获取二手房数量："+str(i)+u"，平均房价为："+str(round(float(sum_pric)/float(i),2))+u"万元每平方")
+    else:
+        print("获取失败！请使用浏览器检查%s是否能正常显示！" % num_area[numb])
+        print(urltx)
+
+#Get the district.
+def get_area():
+    print('')
+    area_input = input('please input the area code:')
+    print('DEBUG:the area input is %s' %area_input)
+    areanum = area_input
+    if str(0) in areanum:#输入有0则计算全部区域
+        print('您输入的区域为：上海所有区域')
+        for numb in ('1','2','3','4','5','6','7','8','9','a','b','c','d','e','f','g','h','i','j','k'):
+            get_price(numb)
+    else:#输入无0则计算输入区域
+        output = u"您输入的区域为："
+        for numb in ('0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f','g','h','i','j','k'):
+            if str(numb) in areanum:
+                output = output+str(area[numb])+" "
+        print(output)
+        for numb in ('0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f','g','h','i','j','k'):
+            if str(numb) in areanum:
+                get_price(numb)
+
+if __name__ == "__main__":
+	get_area()

np_learn.py

@@ -0,0 +1,84 @@
+#!/usr/bin/env python
+# -*- coding:utf-8 -*- 
+
+import tushare as ts
+import matplotlib.pyplot as plt
+from mpl_toolkits.mplot3d import Axes3D
+import numpy as np
+
+#Scatter
+def show_scratter():
+	x = np.linspace(-np.pi, np.pi, 256)
+	y = np.cos(x)
+	plt.scatter(x, y, marker = '.', color = 'blue')
+	#set the x_start, x_end, y_start, y_end.
+	#plt.axis([0, 10, 0, 10])
+	plt.show()
+
+#Line
+def show_line():
+	x = list(range(1,11))
+	y = list(np.cos(y) for y in x)
+	plt.plot(x, y, linestyle = '--', label = 'picture')
+	plt.show()
+
+#Plot line of stock shanghai
+def show_shstock_line():
+	df = ts.get_hist_data('sh', start = '2016-01-01')
+	df.to_excel('stock_sh.xlsx')
+	df.close.plot()
+	ax = plt.gca()
+	ax.invert_xaxis()
+	plt.show()
+
+#Show multiple figures in one picture
+def show_multiple_figures():
+	fig = plt.figure()
+
+	x = list(range(10, 90))
+	y = list(np.sin(y) for y in x)
+
+	p1 = fig.add_subplot(211)
+	p1.plot(x, y)
+
+	p2 = fig.add_subplot(212)
+	p2.scatter(x, list(np.sin(y + np.random.randn()) for y in x))
+
+	plt.show()
+
+#Show two types figures in single picture
+def show_two_in_single():
+	x = np.linspace(0, 10, 1000)
+	y = np.sin(x)
+	z = np.cos(x**2)
+
+	plt.figure(figsize = (8, 4))
+	plt.plot(x, y, label = '$sin(x)$', color = "red", linewidth = 2)
+	plt.plot(x, z, "b--", label = "$cos(x^2)$")
+	plt.xlabel("Time(s)")
+	plt.ylabel("Volt")
+	plt.title('PyPlot First Example')
+	plt.ylim(-1.2, 1.2)
+	plt.legend()
+	plt.show()
+
+#3D
+def show_3D():
+	fig = plt.figure()
+	ax = fig.add_subplot(111, projection = '3d')
+
+	x = [1, 1, 2, 2]
+	y = [3, 4, 4, 3]
+	z = [1, 100, 1, 1]
+
+	ax.plot_trisurf(x, y, z)
+	plt.show()
+
+if __name__ == "__main__":
+	#show_line()
+	show_scratter()
+	#show_shstock_line()
+	#show_multiple_figures()
+	#show_two_in_single()
+	#show_3D()
+