###打开文件并打印：
1 #!/usr/bin/python3 2 3 f = open('F://myproject/test.txt', encoding='utf-8',mode='r') 4 content = f.read() 5 print(content) 6 f.close()
###使用os模块的walk() 遍历文件目录：
1 #!/usr/bin/python3 2 import os 3 import os.path 4 5 dir = "f:/project/" 6 7 for dirpath,dirnames,filenames in os.walk(dir): 8 for dirname in dirnames: 9 print("dirpath is:" + dirpath) 10 print("dirname is:" + dirname) 11 12 for filename in filenames: 13 print ("dirpath is:" + dirpath) 14 print ("filename is:" + filename) 15 print ("the full name of the file is:" + os.path.join(dirpath,filename))
遍历目录下的每一个文件夹(包含它自己), 产生3-元组 (dirpath, dirnames, filenames)【文件夹路径, 文件夹名字, 文件名】
### 冒泡排序
1 #!/usr/bin/python3 2 # coding:utf-8 3 4 def bubbleSort(nums): 5 for i in range(len(nums)-1): 6 for j in range(len(nums)-i-1): 7 if nums[j] > nums[j+1]: 8 nums[j], nums[j+1] = nums[j+1], nums[j] 9 return nums 10 nums = [9,2,45,67,32,7,87,28,6] 11 print(bubbleSort(nums))
range() 函数可创建一个整数列表，range(1,10)表示从[1, 2, 3, 4, 5, 6, 7, 8, 9]
### 插入排序
1 #!/usr/bin/python3 2 # coding:utf-8 3 4 def insert_sort(lists): 5 count = len(lists) 6 for i in range(1, count): 7 key = lists[i] 8 j = i - 1 9 while j >= 0: 10 if lists[j] > key: 11 lists[j + 1] = lists[j] 12 lists[j] = key 13 j -= 1 14 return lists
### 选择排序
1 #!/usr/bin/python3 2 # coding:utf-8 3 4 def select_sort(lists): 5 count = len(lists) 6 for i in range(0, count): 7 cnt = i 8 for j in range(i + 1, count): 9 if lists[cnt] > lists[j]: 10 cnt = j 11 lists[cnt], lists[i] = lists[i], lists[cnt] 12 return lists
### 输出乘法表
1 print(' '.join([' '.join(['%d * %d = %d'%(y,x,x*y) for y in range(1,x+1)])for x in range(1,10)]))
join() 方法用于将序列中的元素以指定的字符连接生成一个新的字符串。‘ ’.join(parameter) 表示用' '连接元素序列parameter中的各元素
### 删除列表重复元素
1 list = [1,1,2,3,6,8,9,6,6,7,8] 2 set(list)
### 反转字符串
1 str = "string" 2 str[::-1]
### 切割字符串
1 #!/usr/bin/python3 2 # coding:utf-8 3 4 str="1:a$2:b$3:c$4:d" 5 str_list=str.split('$') 6 res={} 7 for l in str_list: 8 key,value=l.split(':') 9 res[key]=value 10 print(res)