今天做些能回顾所学知识点的小练习，类似的问题参考别人的代码，修改成自己容易理解的模样。
1、实现简单的栈。put(item)实现数据item插入栈中；get()实现从栈中取一个数据。
# -*- coding: utf-8 -*-
class MyStack(object):
'''MyStack
自定义栈，操作有put(), get()
'''
def __init__(self):
self.head = -1
self.stack = []
def put(self, item):
self.head += 1
self.stack.append(item)
print('Put %s Success' % item)
def get(self):
if self.head < 0:
return "Put Error: The Stack is Overflow!"
else:
self.head -= 1
return self.stack.pop()
def isEmpty(self):
return self.item == []
if __name__ == "__main__":
mystack = MyStack()
mystack.put('a')
mystack.put('b')
print(mystack.get())
mystack.put('c')
print(mystack.get())
print(mystack.get())
print(mystack.get())运行结果如下：
Put a Success Put b Success b Put c Success c a Put Error: The Stack is Overflow!
2、判断指定网页使用的编码。
# -*- coding: utf-8 -*-
import sys
import requests
import chardet
def web_detect(url):
#检测网页的编码方式
try:
response = requests.get(url)
except:
print('error')
return 0
web= response.content
response.close()
codedetect = chardet.detect(web)["encoding"]
print('%s\t<-\t%s' % (url, codedetect))
return 1
if __name__ == '__main__':
if len(sys.argv) == 1:
print('usage:\n\tpython XX.py http://xxx.com')
else:
web_detect(sys.argv[1])运行效果如下：
C:\>python webdetect.py http://blog.51cto.com/9473774 http://blog.51cto.com/9473774 <- utf-8 C:\>python webdetect.py http://www.163.com http://www.163.com <- GB2312
3、遍历指定目录下的所有文件，找出其中占用空间最大的前3个文件。
# -*- coding: utf-8 -*-
import sys
import os
def get_top_three(path):
d = {}
for root, dirs, files in os.walk(path):
for file in files:
fname = os.path.join(root, file)
fsize = os.stat(fname).st_size
d[fname] = fsize
#print(d)
f = sorted(zip(d.values(), d.keys()))
for i in [-1, -2, -3]:
for j in f[i]:
print(j)
get_top_three('E:\\iso\\CentOS-6.8-x86_64-bin-DVD1')运行结果如下：
146313216 E:\iso\CentOS-6.8-x86_64-bin-DVD1\images\install.img 45373440 E:\iso\CentOS-6.8-x86_64-bin-DVD1\images\efidisk.img 40688737 E:\iso\CentOS-6.8-x86_64-bin-DVD1\isolinux\initrd.img
原文地址：http://blog.51cto.com/9473774/2091006
