随笔分类 - python
摘要：setp = set(["Red", "Green"]) setq = setp.copy() print(setq) setp.clear() print(setq)
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摘要：#A new empty set color_set = set() color_set.add("Red") print(color_set) #Add multiple items color_set.update(["blue","blue", "Green"]) print(color_set)
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摘要：#create a tuple l = [(1,2), (3,4), (8,9)] print(list(zip(*l)))
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摘要：#create a tuple tuplex = 4, 8, 3 print(tuplex) n1, n2, n3 = tuplex #unpack a tuple in variables print(n1 + n2 + n3) #the number of variables must be equal to the number of items of the tuple n1, n2...
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摘要：#create a tuple tuplex = (2, 4, 3, 5, 4, 6, 7, 8, 6, 1) #used tuple[start:stop] the start index is inclusive and the stop index _slice = tuplex[3:5] #is exclusive print(_slice) #if the start index ...
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摘要：#create a tuple x = ("w3resource") # Reversed the tuple y = reversed(x) print(tuple(y)) #create another tuple x = (5, 10, 15, 20) # Reversed the tuple y = reversed(x) print(tuple(y))
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摘要：#create a tuple tuplex = "w", "j" ,"c", "e" print(tuplex) #tuples are immutable, so you can not remove elements #using merge of tuples with the + operator you can remove an item and it will create ...
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摘要：#create a tuple tuplex = 2, 4, 5, 6, 2, 3, 4, 4, 7 print(tuplex) #return the number of times it appears in the tuple. count = tuplex.count(4) print(count)
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摘要：#create a tuple tuplex = tuple("index tuple") print(tuplex) #get index of the first item whose value is passed as parameter index = tuplex.index("p") print(index) #define the index from which you w...
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摘要：from copy import deepcopy #create a tuple tuplex = ("HELLO", 5, [], True) print(tuplex) #make a copy of a tuple using deepcopy() function tuplex_clone = deepcopy(tuplex) tuplex_clone[2].append(50) ...
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摘要：tup = ('e', 'x', 'e', 'r', 'c', 'i', 's', 'e', 's') str = ''.join(tup) print(str)
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摘要：#create a tuple tuplex = ((2, "w"),(3, "r")) print(dict((y, x) for x, y in tuplex))
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摘要：#create a list l = [("x", 1), ("x", 2), ("x", 3), ("y", 1), ("y", 2), ("z", 1)] d = {} for a, b in l: d.setdefault(a, []).append(b) print (d)
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摘要：第一种 第二种 shell下的一句话脚本，在命令行执行以下语句
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摘要：这个也是python彪悍的特性. 自省就是面向对象的语言所写的程序在运行时,所能知道对象的类型.简单一句就是运行时能够获得对象的类型.比如type(),dir(),getattr(),hasattr(),isinstance(). a = [1,2,3] b = {'a':1,'b':2,'c':3
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摘要：a = 1 def fun(a): a = 2 fun(a) print a # 1 a = [] def fun(a): a.append(1) fun(a) print a # [1]
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摘要：⾸先我们来理解下Python中的函数 def hi(name="yasoob"): return "hi " + name print(hi()) # output: 'hi yasoob' # 我们甚⾄可以将⼀个函数赋值给⼀个变量，⽐如 greet = hi # 我们这⾥没有在使⽤⼩括号，因为我们并不是在调⽤hi函数 # ⽽是在将它放在greet变量⾥头。我们尝试运⾏下这个 print(g...
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摘要：def hi(name="yasoob"): def greet(): return "now you are in the greet() function" def welcome(): return "now you are in the welcome() function" if name == "yasoob": ...
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