Merge pull request Show-Me-the-Code#27 from renzongxian/master

Add the solution to 0013, 0021, 0022

Author: horx

renzongxian/0013/0013.py

@@ -0,0 +1,33 @@
+# Source:https://github.com/Show-Me-the-Code/show-me-the-code
+# Author:renzongxian
+# Date:2014-12-24
+# Python 3.4
+
+"""
+
+第 0013 题： 用 Python 写一个爬图片的程序，爬 这个链接里的日本妹子图片 :-)
+
+"""
+
+import urllib.request
+import re
+import os
+
+
+def fetch_pictures(url):
+    html_content = urllib.request.urlopen(url).read()
+    r = re.compile('<img pic_type="0" class="BDE_Image" src="(.*?)"')
+    picture_url_list = r.findall(html_content.decode('utf-8'))
+
+    os.mkdir('pictures')
+    os.chdir(os.path.join(os.getcwd(), 'pictures'))
+    for i in range(len(picture_url_list)):
+        picture_name = str(i) + '.jpg'
+        try:
+            urllib.request.urlretrieve(picture_url_list[i], picture_name)
+            print("Success to download " + picture_url_list[i])
+        except:
+            print("Fail to download " + picture_url_list[i])
+
+if __name__ == '__main__':
+    fetch_pictures("http://tieba.baidu.com/p/2166231880")

renzongxian/0016/0016.py

@@ -1,6 +1,6 @@
 # Source:https://github.com/Show-Me-the-Code/show-me-the-code
 # Author:renzongxian
-# Date:2014-12-22
+# Date:2014-12-23
 # Python 3.4
 
 """

renzongxian/0017/0017.py

@@ -1,6 +1,6 @@
 # Source:https://github.com/Show-Me-the-Code/show-me-the-code
 # Author:renzongxian
-# Date:2014-12-22
+# Date:2014-12-23
 # Python 3.4
 
 """

renzongxian/0021/0021.py

@@ -0,0 +1,27 @@
+# Source:https://github.com/Show-Me-the-Code/show-me-the-code
+# Author:renzongxian
+# Date:2014-12-24
+# Python 3.4
+
+"""
+
+第 0021 题： 通常，登陆某个网站或者 APP，需要使用用户名和密码。密码是如何加密后存储起来的呢？
+请使用 Python 对密码加密。
+
+"""
+
+import uuid
+import hashlib
+
+
+def encrypt_password(password):
+    salt = uuid.uuid4().hex
+    result = password
+    for i in range(10):
+        result = hashlib.sha256(salt.encode() + result.encode()).hexdigest()
+    return salt + ':' + result
+
+if __name__ == '__main__':
+    pw = input('Please input your password:')
+    print("The password stored in the database is:" + encrypt_password(pw))
+

renzongxian/0022/0022.py

@@ -0,0 +1,55 @@
+# Source:https://github.com/Show-Me-the-Code/show-me-the-code
+# Author:renzongxian
+# Date:2014-12-24
+# Python 3.4
+
+"""
+
+第 0022 题： iPhone 6、iPhone 6 Plus 早已上市开卖。请查看你写得 第 0005 题的代码是否可以复用。
+
+"""
+
+from PIL import Image
+import os
+import sys
+
+
+def resize_image(image, t_weight, t_height):
+    im = Image.open(image)
+    weight, height = im.size
+    if weight > t_weight or height > t_height:
+        dw = weight / t_weight
+        dh = height / t_height
+        ds = max(dw, dh)
+        new_weight = int(weight / ds)
+        new_height = int(height / ds)
+        im = im.resize((new_weight, new_height))
+        print("Succeed to resize the image %s to %s*%s " % (image,  new_weight, new_height))
+        im.save(image)
+    else:
+        print("The image %s doesn't need to be resized." % image)
+
+
+if __name__ == "__main__":
+    trans_weight = 0
+    trans_height = 0
+    if len(sys.argv) <= 1:
+        print("Need at least 1 parameter. Try to execute 'python 0022.py $dir_path'")
+    else:
+        while True:
+            flag = input("请选择你要转换的分辨率: 1. iPhone 6  2. iPhone 6 Plus:")
+            if flag == '1':
+                trans_weight = 750
+                trans_height = 1334
+                break
+            elif flag == '2':
+                trans_weight = 1080
+                trans_height = 1920
+                break
+            else:
+                print("输入有误，重新选择!")
+        for dir_path in sys.argv[1:]:
+            for image_name in os.listdir(dir_path):
+                image_path = os.path.join(dir_path, image_name)
+                resize_image(image_path, trans_weight, trans_height)
+