标签：style blog color 使用 sp for strong on 数据
Python程序员通常把内置函数称为BIF，print() BIF的作用是吧消息显示到标准输出（通常是屏幕）
1 print("You can experiment with code within IDEL‘s shell Coool, eh?")
2 if 43>42
3 print("Don‘t panic!")
要遵循的四个步骤：
Python的变量标识符没有类型
movies =["The Holy Grail","The Life of Brian","The meaning of Life" ]
print(movies[1]) #堆栈中的第一个槽编号为0
可使用print（） BIF再屏幕上显示一个列表，使用len()BIF得出列表中有多少个数据项
>>> cast =["Cleese",‘Palin‘,‘Jones‘,"Idle"] >>> print(cast) [‘Cleese‘, ‘Palin‘, ‘Jones‘, ‘Idle‘] >>> print(len(cast)) 4 >>> print(cast[1]) Palin
再列表末尾增加一个数据项使用方法append()，从列表末尾删除数据使用方法(pop())，在列表末尾增加一个数据项集合extend();
1 >>> cast.append("Gilliam")
2 >>> print(cast)
3 [‘Cleese‘, ‘Palin‘, ‘Jones‘, ‘Idle‘, ‘Gilliam‘]
4 >>> cast.pop()
5 ‘Gilliam‘
6 >>> print(cast)
7 [‘Cleese‘, ‘Palin‘, ‘Jones‘, ‘Idle‘]
8 >>> cast.extend(["Gilliam","Chapman"])
9 >>> print(cast)
10 [‘Cleese‘, ‘Palin‘, ‘Jones‘, ‘Idle‘, ‘Gilliam‘, ‘Chapman‘]
删除特定的数据项，在某些特定的位置插入一个元素
>>> cast.remove("Chapman")
>>> print(cast)
[‘Cleese‘, ‘Palin‘, ‘Jones‘, ‘Idle‘, ‘Gilliam‘]
>>> cast.insert(0,"Chapman")
>>> print(cast)
[‘Chapman‘, ‘Cleese‘, ‘Palin‘, ‘Jones‘, ‘Idle‘, ‘Gilliam‘]
在之前的movies每一项前增加时间
代码一：
>>> movies.insert(1,1975)#用合适的列表方法增加需要的额外数据 >>> movies.insert(3,1979) >>> movies.append(1983) >>> print(movies) [‘The Holy Grail‘, 1975, ‘The Life of Brian‘, 1979, ‘The meaning of Life‘, 1983]
方法二：
>>> movies=[‘The Holy Grail‘, 1975, ‘The Life of Brian‘, 1979, ‘The meaning of Life‘, 1983]#从头开始重新创建列表 >>> print(movies) [‘The Holy Grail‘, 1975, ‘The Life of Brian‘, 1979, ‘The meaning of Life‘, 1983]
for迭代处理数据（for循环是可伸缩的，适用于任意大小的列表）
>>> for each_flick in fav_movies:#冒号放在列表名后边，指示列表处理代码的开始
print(each_flick) """注意前面有TAB"""
while和for的对比，完成相同的工作
while:
>>> count=0
>>> while count<len(movies):
print(movies[count])
count=count+1
for:
>>> for each_item in movies:
print(each_item)
列表可以存放混合类型的数据，也包含任何列表
movies=[‘The Holy Grail‘, 1975, "Terry Jones & Terry Gilliam",91,["Graham Chapman",["Michael Palin","John Cleese","Terry Gilliam","Eric Idle","Terry Jones"]]] print(movies[4][1][3])
用for循环来处理这个列表
>>> movies=[‘The Holy Grail‘, 1975, "Terry Jones & Terry Gilliam",91,["Graham Chapman",["Michael Palin","John Cleese","Terry Gilliam","Eric Idle","Terry Jones"]]]
>>> print(movies[4][1][3])
Eric Idle
>>> print(movies)
[‘The Holy Grail‘, 1975, ‘Terry Jones & Terry Gilliam‘, 91, [‘Graham Chapman‘, [‘Michael Palin‘, ‘John Cleese‘, ‘Terry Gilliam‘, ‘Eric Idle‘, ‘Terry Jones‘]]]
>>> for each_item in movies:
print(each_item)
The Holy Grail
1975
Terry Jones & Terry Gilliam
91
[‘Graham Chapman‘, [‘Michael Palin‘, ‘John Cleese‘, ‘Terry Gilliam‘, ‘Eric Idle‘, ‘Terry Jones‘]]
if...else...模式：
if 某个条件满足 ：
"true"组
esle：
"false"组
isinstance() 用来检查某个特定标识符是否包含某个特定类型的数据
for each_item in movies:
if isinstance(each_item,list):
for nested_item in each_item:
if isinstance(nested_item,list):
for deeper_item in nested_item:
print(deeper_item)
else:
print(nested_item)
else:
print(each_item)
The Holy Grail
1975
Terry Jones & Terry Gilliam
91
Graham Chapman
Michael Palin
John Cleese
Terry Gilliam
Eric Idle
Terry Jones
在Python中创建一个函数
定义函数的标准形式：
def 函数名（参数）：
函数代码组
>>> def print_lol(the_list):
for each_item in the_list:#递归处理任意深度的嵌套列表
if isinstance(each_item,list):
print_lol(each_item)
else:
print(each_item)
>>> print_lol(movies)
Python3默认递归深度不能超过100
标签：style blog color 使用 sp for strong on 数据
原文地址：http://www.cnblogs.com/cfcf0517/p/4157855.html
