jackfrued
/
LearnPython
mirror of https://github.com/jackfrued/LearnPython.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Merge pull request #10 from zhisheng17/master 

update python_base.py
master
xianhu 2016-11-08 11:33:41 +08:00 committed by GitHub
parent e7168947e0 d1a5a5a905
commit dca203b811
1 changed files with 5 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
python_base.py
View File

@ -254,7 +254,7 @@
#-- 常用字典常量和操作 #-- 常用字典常量和操作
D = {} D = {}
D = {'spam':2, 'tol':{'ham':1}} # 嵌套字典 D = {'spam':2, 'tol':{'ham':1}} # 嵌套字典
D = dict.fromkeys(['s', 'd'], 8) # {'d': 8, 's': 8} D = dict.fromkeys(['s', 'd'], 8) # {'s': 8, 'd': 8}
D = dict(name = 'tom', age = 12) # {'age': 12, 'name': 'tom'} D = dict(name = 'tom', age = 12) # {'age': 12, 'name': 'tom'}
D = dict([('name', 'tom'), ('age', 12)]) # {'age': 12, 'name': 'tom'} D = dict([('name', 'tom'), ('age', 12)]) # {'age': 12, 'name': 'tom'}
D = dict(zip(['name', 'age'], ['tom', 12])) # {'age': 12, 'name': 'tom'} D = dict(zip(['name', 'age'], ['tom', 12])) # {'age': 12, 'name': 'tom'}
@ -270,8 +270,8 @@
# 字典注意事项：（1）对新索引赋值会添加一项（2）字典键不一定非得是字符串，也可以为任何的不可变对象 # 字典注意事项：（1）对新索引赋值会添加一项（2）字典键不一定非得是字符串，也可以为任何的不可变对象
#-- 字典解析 #-- 字典解析
D = {k:8 for k in ['s', 'd']} # {'d': 8, 's': 8} D = {k:8 for k in ['s', 'd']} # {'s': 8, 'd': 8}
D = {k:v for (k, v) in zip(['name', 'age'], ['tom', 12])} D = {k:v for (k, v) in zip(['name', 'age'], ['tom', 12])} # {'age': 12, 'name': tom}
#-- 字典的特殊方法__missing__：当查找找不到key时，会执行该方法 #-- 字典的特殊方法__missing__：当查找找不到key时，会执行该方法
class Dict(dict): class Dict(dict):
@ -335,8 +335,8 @@
#-- 序列赋值 序列解包 #-- 序列赋值 序列解包
[a, b, c] = (1, 2, 3) # a = 1, b = 2, c = 3 [a, b, c] = (1, 2, 3) # a = 1, b = 2, c = 3
a, b, c, d = "spam" # a = 's', b = 'p' a, b, c, d = "spam" # a = 's', b = 'p', c = 'a', d = 'm'
a, b, c = range(3) # a = 0, b = 1 a, b, c = range(3) # a = 0, b = 1, c = 2
a, *b = [1, 2, 3, 4] # a = 1, b = [2, 3, 4] a, *b = [1, 2, 3, 4] # a = 1, b = [2, 3, 4]
*a, b = [1, 2, 3, 4] # a = [1, 2, 3], b = 4 *a, b = [1, 2, 3, 4] # a = [1, 2, 3], b = 4
a, *b, c = [1, 2, 3, 4] # a = 1, b = [2, 3], c = 4 a, *b, c = [1, 2, 3, 4] # a = 1, b = [2, 3], c = 4