###########列表操作################ # 定义列表:my_girl_friends=['alex','wupeiqi','yuanhao',4,5] #本质my_girl_friends=list([...]) # 或 l=list('abc') #索引取值 # l=[1,2,3,4,5,6] #正向取值 # a=l[0:3:1] #顾头不顾尾 0-3 之间取 0 1 2 不到3 1为步长 # print (a) # l=[1,2,3,4,5,6] #反向取值 # l[2::-1] #从开始正向2 取到 1 2 3 -1 从倒着开始第一取值 3 2 1 # l=[1,2,3,4,5,6] #全反 # l[::-1] #:: 任意区间 -1 倒着 反着取 [6,5,4,3,2,1] #len 取列表长度 # stus=['alex','egon','www','aaa','ladasd'] # print(len(stus)) #成员运算 in 和 not in # stus=['alex','egon','wxx','yxx','lxx'] # print('alex' in stus) # print('alex' not in stus) 判断元素是否在列表里面 #追加 # stus=['alex','egon','wxx','yxx','lxx'] # stus.append('xxx') # print (stus) #插入 # stus=['alex','egon','wxx','yxx','lxx'] # stus.insert(0,'阿里渴死') # print(stus) #删除 # stus=['alex','egon','wxx','yxx','lxx'] # del stus[1] # print(stus) # stus.remove('alex') # print(stus) #循环 #依赖索引 # stus=['alex','egon','wxx','yxx','lxx'] # i=0 # while i < len(stus): # print(stus[i]) # i+=1 #不依赖索引 # for item in stus: # print(item) # for i in range(len(stus)): # print(i,stus[i]) #count 操作统计元素个数 # stus=['alex','egon','abcd','wxx','yxx','lxx'] # print(stus.count('alex')) #extend扩展列表单个参数 # stus.extend(['a','b','c']) # print(stus) #append 整个列表加入 # stus=['alex','egon','abcd','wxx','yxx','lxx'] # stus.append(['a','b','c']) # print (stus) #取索引 # stus=['alex','egon','abcd','alex','wxx','yxx','lxx'] # print(stus.index('alex',1,5)) #取元素索引