Python随笔(二)、python基础
源自：http://www.cnblogs.com/wupeiqi/articles/4906230.html一、接收执行参数
sys.argv 接收执行参数的函数
#!usr/bin/env python #-*- coding:utf-8 _*-
"""
@author:Administrator
@file: sysargv.py
@time: 2017/11/19
"""
import sys print (sys.argv)
执行结果
# python index.py 8000
['index.py', '8000']
# python index.py runserver
['index.py', 'runserver']
列表，元祖：
区别，列表可以被修改，元祖不能被修改，列表包含元祖
元祖的元素不能被修改，元祖的元素的元素可以被修改。如下程序所示
#!usr/bin/env python #-*- coding:utf-8 _*-
"""
@author:Administrator
@file: tuple.py
@time: 2017/11/19
"""
t1 = (1,2,{'k1':'v1'}) #t1['k1'] = 2
#print(t1)
t1 = 123print(t1) 执行报错：
Traceback (most recent call last):
File "C:/Users/Administrator/PycharmProjects/S12/2017-11-19/tuple.py", line 11, in <module>
t1 = 123
TypeError: 'tuple' object does not support item assignment
#!usr/bin/env python #-*- coding:utf-8 _*-
"""
@author:Administrator
@file: tuple.py
@time: 2017/11/19
"""
t1 = (1,2,{'k1':'v1'}) t1['k1'] = 2
print(t1) 执行结果：
(1, 2, {'k1': 2})
Process finished with exit code 0
对于python,一切事物皆是对象，对象基于类创建
字符串常用功能：
[*] 移除空白 strip
[*] 分割 slipt
[*] 长度 len
[*] 索引 index
[*] 切片 [:-1]
4、列表
创建列表：
123name_list = ['alex', 'seven', 'eric']或name_list ＝ list(['alex', 'seven', 'eric']) 基本操作：
[*] 索引 index
[*] 追加 append
[*] 删除 del
[*] 长度 len
[*] 切片 [:-1]
[*] 循环 for while
[*] 包含 in
5、元祖
创建元祖：
123ages = (11, 22, 33, 44, 55)或ages = tuple((11, 22, 33, 44, 55)) 基本操作：
[*] 索引 index
[*] 切片 [:-1]
[*] 循环 for while
[*] 长度 len
[*] 包含 in
6、字典（无序）
创建字典：
123person = {"name": "mr.wu", 'age': 18}或person = dict({"name": "mr.wu", 'age': 18}) 常用操作：
[*] 索引
[*] 新增
[*] 删除 del pop remove
[*] 键、值、键值对 keys values items
[*] 循环 for while
[*] 长度 len
PS：循环，range，continue 和 break
int常用功能介绍：
age = int(18)
shift + 鼠标指向int,查看内置函数
求商和余数，执行结果得到两个数的元祖
#!usr/bin/env python #-*- coding:utf-8 _*-
"""
@author:Administrator
@file: divmod.py
@time: 2017/11/19
"""
all_list = 95pager = 10result = all_list.__divmod__(10) print(result)
执行结果：
(9, 5)
字典：
#!usr/bin/env python #-*- coding:utf-8 _*-
"""
@author:Administrator
@file: dic.py
@time: 2017/11/19
"""
dic = {'k1':'v1','k2':'v2'} print(dic['k1'])
print(dic['k2'])
#print(dic['k3'])
print(dic.get('k3','default')) for循环取k,v值
#!usr/bin/env python #-*- coding:utf-8 _*-
"""
@author:Administrator
@file: dic.py
@time: 2017/11/19
"""
dic = {'k1':'v1','k2':'v2','k3':'v3'} print(dic['k1'])
print(dic['k2'])
print(dic['k3'])
for k in dic.keys():print(k) for v in dic.values():
print(v)
for k,v in dic.items():
print(k,v）
执行结果：
v1
v2
v3
k1
k2
k3
v1
v2
v3
k1 v1
k2 v2
k3 v3
pop参数，必须指定一个值，因为字典是无序的，接上文截图
result =dic.pop('k3') print(result)
#!usr/bin/env python #-*- coding:utf-8 _*-
"""
@author:Administrator
@file: dictionary.py
@time: 2017/11/19
"""
''' 有如下集合，将所有大于66的值保存在字典的第一个key中，将小于66的值保存在第二个key的值中
即：{'k1'：大于66，'k2':小于66}
'''
dic = {} all_list =
for i in all_list:
if i > 66:if "k1" in dic.keys():dic["k1"].append(i) else:
dic['k1'] =
else:
if "k2" in dic.keys():
dic["k2"].append(i)
else:
dic['k2'] =
print(dic['k1'])
print(dic['k2'])
页:
[1]