使用切片器对list，tuple，或者string进行处理
>>> lis = [1,2,3,4,5,6,7,8,9,10] >>> lis[:5] [1, 2, 3, 4, 5] #取前5个 >>> lis[5:] [6, 7, 8, 9, 10] # 取后5个 >>> lis[::2] [1, 3, 5, 7, 9] #隔两个取一个 >>> lis[:] [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] #复制
列表生成器
>>> [i for i in range(10)] #生成一个0到9的list [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] >>> [i*i for i in range(10)] #参数也可以计算 [0, 1, 4, 9, 16, 25, 36, 49, 64, 81] >>> [i*i for i in range(10) if i %2 ==0] #对参数进行条件判断 [0, 4, 16, 36, 64] >>> a = [\'a\',\'b\',\'c\',\'d\'] >>> b=[\'1\',\'2\',\'3\',\'4\'] >>> [i+j for i in a for j in b] [\'a1\', \'a2\', \'a3\', \'a4\', \'b1\', \'b2\', \'b3\', \'b4\', \'c1\', \'c2\', \'c3\', \'c4\', \'d1\', \'d2\', \'d3\', \'d4\'] #二维的排列组合 >>> [(i,j) for i in a for j in b] [(\'a\', \'1\'), (\'a\', \'2\'), (\'a\', \'3\'), (\'a\', \'4\'), (\'b\', \'1\'), (\'b\', \'2\'), (\'b\', \'3\'), (\'b\', \'4\'), (\'c\', \'1\'), (\'c\', \'2\'), (\'c\', \'3\'), (\'c\', \'4\'), (\'d\', \'1\'), (\'d\', \'2\'), (\'d\', \'3\'), (\'d\', \'4\')] #生成tuple >>> [[i,j] for i in a for j in b] [[\'a\', \'1\'], [\'a\', \'2\'], [\'a\', \'3\'], [\'a\', \'4\'], [\'b\', \'1\'], [\'b\', \'2\'], [\'b\', \'3\'], [\'b\', \'4\'], [\'c\', \'1\'], [\'c\', \'2\'], [\'c\', \'3\'], [\'c\', \'4\'], [\'d\', \'1\'], [\'d\', \'2\'], [\'d\', \'3\'], [\'d\', \'4\']] #生成list >>> [i for i in os.listdir()] #获取当前目录中的文件 [\'chromedriver.exe\', \'curl.exe\', \'DLLs\', \'Doc\', \'geckodriver.exe\', \'include\', \'Lib\', \'libs\', \'LICENSE.txt\', \'NEWS.txt\', \'python.exe\', \'python3.dll\', \'python37.dll\', \'pythonw.exe\', \'Scripts\', \'tcl\', \'Tools\', \'vcruntime140.dll\'] >>> [i if i %2 ==0 else 0 for i in range(10)] #if else 表达式的使用 [0, 0, 2, 0, 4, 0, 6, 0, 8, 0] >>> lis = [\' ad\',\'4654 6\',\'sfaf daf \'] # 快速去除列表中的字符串中的空格 >>> [i.strip() for i in lis] [\'ad\', \'4654 6\', \'sfaf daf\'] >>> a = [[\'a\',\'b\'],[\'c\',\'d\'],[\'e\',\'f\']] >>> [j for i in a for j in i] [\'a\', \'b\', \'c\', \'d\', \'e\', \'f\'] # 实现列表的组合