Python学习笔记：第一次接触

用的是windows的IDLE(python 3)

对象的认识：先创建一个list对象(用方括号)

 a = ['xieziyang','chenmanru']
 a

对list中对象的引用

 a[0] # 表示列表a中的第一个对象

在列表的末尾添加一个对象

 a.append('xiemanru')
 a.insert(0,'xiemanru1') # 在指定位置插入一个对象insert object before index

移除对象

a.remove('xiemanru')
a

for循环：

  movies = ['The Holy Grail','The Life of Brian','The Meaning of Life']
  years = [1975,1979,1983]
  k = 1
  for time in years:
            movies.insert(k,time)
        k = k+2
  movies

在列表中再插入一个列表：

 movies.insert(2,['Transformer',2007]

引用：

>>> movies[2][0]
'Transformer'

嵌套列表的打印：

 >>> for each_item in movies:
     if isinstance(each_item,list):  # 判断each_item是否为列表
         for nested_item in each_item:
             print(nested_item)
     else:
         print(each_item)

对于多重嵌套列表的打印：再添加一个列表

 >>> movies[2].insert(1,['阿甘正传',2010])
 >>> movies
['The Holy Grail', 1975, ['Transformer', ['阿甘正传', 2010], 2007], 'The Life of Brian', 1979, 'The Meaning of Life', 1983]

定义函数：

 def print_it_all(the_list):  # 定义一个函数：def 函数名(参数):函数代码组
     for each_item in the_list:
         if isinstance(each_item,list):
             print_it_all(each_item)
         else:
             print(each_item)

看看效果：

 >>> print_it_all(movies)
 The Holy Grail
 1975
 Transformer
 阿甘正传
 2010
 2007
 The Life of Brian
 1979
 The Meaning of Life
 1983

改进一下，打印的更好看：

 def print_it_all(the_list,level):
     for each_item in the_list:
         if isinstance(each_item,list):
             print_it_all(each_item,level+1)
         else:
             for tab_stop in range(level):
                 print("\t",end = '')
             print(each_item)

看一下结果：

 print_it_all(movies,0)
 The Holy Grail
 1975
     Transformer
         阿甘正传
         2010
     2007
 The Life of Brian
 1979
 The Meaning of Life
 1983

再添加一个参数控制是否缩进打印：

 def print_it_all(the_list,indent = False,level = 0):
     for each_item in the_list:
         if isinstance(each_item,list):
             print_it_all(each_item,indent,level+1)
         else:
             if indent:
                 for tab_stop in range(level):
                     print("\t",end = '')
             print(each_item)

看看结果怎么样：

 >>> print_it_all(movies)
 The Holy Grail
 1975
 Transformer
 阿甘正传
 2010
 2007
 The Life of Brian
 1979
 The Meaning of Life
 1983
 >>> print_it_all(movies,indent = True)
 The Holy Grail
 1975
     Transformer
         阿甘正传
         2010
     2007
 The Life of Brian
 1979
 The Meaning of Life
 1983

看的书是head frist Python，挺适合初学者看的

以上代码也是参照上书内容，敲几遍就变成自己的了:)

欢迎大家来指教