Python中list的详细操作描述(举例说明)
2018-01-18 15:53
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创建和访问列表
bicycle = ['trek', 'cannondale', 'redline','specialized'] print bicycle print bicycle[0] # 下标从0开始 print bicycle[-1] # 最后一个元素 print bicycle[:1] print bicycle[1:3] print bicycle[0].title() # 首字母大写 message = 'My first bicycle was a '+bicycle[0].title()+'.' print message1
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['trek', 'cannondale', 'redline', 'specialized'] trek specialized ['trek'] ['cannondale', 'redline'] Trek My first bicycle was a Trek.1
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修改、添加和删除元素
## 修改指定元素 bicycle = ['trek', 'cannondale', 'redline','specialized'] bicycle[1] = 'baoma' bicycle[2:] = ['baoma','haima'] print bicycle1
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['trek', 'baoma', 'baoma', 'haima']1
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## 添加元素 bicycle.append('xiaodao') # 末尾添加 print bicycle bicycle.insert(1,'bb') # 指定位置插入 print bicycle1
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['trek', 'baoma', 'baoma', 'haima', 'xiaodao'] ['trek', 'bb', 'baoma', 'baoma', 'haima', 'xiaodao']1
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## 删除元素 bicycle = ['trek0', 'trek1','trek2','trek3','trek4','trek5'] del bicycle[1] print bicycle bicycle_pop = bicycle.pop() # 相当于从列表中取出最后一个元素,此时列表中不再有该元素 print bicycle_pop print bicycle bicycle_pop0 = bicycle.pop(0) # 取出指定位置的元素,此时列表中不再有该元素 print bicycle_pop0 print bicycle bicycle.remove('trek3') # 用于不知道具体的索引位置,只知道具体的值 print bicycle1
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['trek0', 'trek2', 'trek3', 'trek4', 'trek5'] trek5 ['trek0', 'trek2', 'trek3', 'trek4'] trek0 ['trek2', 'trek3', 'trek4'] ['trek2', 'trek4']1
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列表操作
## sort永久性排序 cars = ['bwm','audi','toyota','subaru'] cars.sort() # 对列表进行永久性排序(改变了列表本身) print cars cars = ['bwm','audi','toyota','subaru'] cars.sort(reverse=True) #设置排序时是否倒序 print cars ## sorted临时排序 cars = ['bwm','audi','toyota','subaru'] print sorted(cars) # 12c43 列表自身元素未发生改变 print cars1
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['audi', 'bwm', 'subaru', 'toyota'] ['toyota', 'subaru', 'bwm', 'audi'] ['audi', 'bwm', 'subaru', 'toyota'] ['bwm', 'audi', 'toyota', 'subaru']1
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## 倒着打印列表 cars = ['bwm','audi','toyota','subaru'] print cars cars.reverse() #列表元素顺序被翻转(再调用一次即可恢复原来顺序) print cars ## 确定列表长度 print len(cars)1
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['bwm', 'audi', 'toyota', 'subaru'] ['subaru', 'toyota', 'audi', 'bwm'] 41
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## 创建数值列表 number1 = list(range(1,6)) print number1 number2 = list(range(1,11,2)) print number21
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[1, 2, 3, 4, 5] [1, 3, 5, 7, 9]1
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## 通过循环创建所需列表 squares1 = [] for value in range(1,11,2): square = value**2 squares1.append(square) print squares1 squares2 = [value**2 for value in range(1,11,2)] print squares21
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[1, 9, 25, 49, 81] [1, 9, 25, 49, 81]1
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## 对数字列表进行简单的统计计算 digits = [1,2,3,4,5] print min(digits) print max(digits) print sum(digits)1
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1 5 151
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## 切片 players = ['aaa','bbb','ccc','ddd','eee','fff'] print players[0:3] print players[:3] print players[3:] print players[:-3] print players[-3:] ## 遍历 players = ['aaa','bbb','ccc','ddd','eee','fff'] for player in players[:3]: print player.title() ## 复制(注意两种复制结果的不同) print '--------------------------------------------' players = ['aaa','bbb','ccc','ddd','eee','fff'] players_copy1 = players[:]# 产生两个列表(两个列表复制后无关系) print players_copy1 players.append('ggg1') players_copy1.append('ggg2') print players print players_copy1 print '------------------' players = ['aaa','bbb','ccc','ddd','eee','fff'] players_copy2 = players # 产生同一个列表的副本,变动一个列表,另一个也会变动 print players_copy2 players.append('ggg1') players_copy2.append('ggg2') print players print players_copy21
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['aaa', 'bbb', 'ccc'] ['aaa', 'bbb', 'ccc'] ['ddd', 'eee', 'fff'] ['aaa', 'bbb', 'ccc'] ['ddd', 'eee', 'fff'] Aaa Bbb Ccc -------------------------------------------- ['aaa', 'bbb', 'ccc', 'ddd', 'eee', 'fff'] ['aaa', 'bbb', 'ccc', 'ddd', 'eee', 'fff', 'ggg1'] ['aaa', 'bbb', 'ccc', 'ddd', 'eee', 'fff', 'ggg2'] ------------------ ['aaa', 'bbb', 'ccc', 'ddd', 'eee', 'fff'] ['aaa', 'bbb', 'ccc', 'ddd', 'eee', 'fff', 'ggg1', 'ggg2'] ['aaa', 'bbb', 'ccc', 'ddd', 'eee', 'fff', 'ggg1', 'ggg2']1
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元祖(不可变的列表)
## 定义元祖 dims = (20,50) print dims[0],dims[1] print type(dims) ##元祖不可改 dims[1] = 30 # 此处会报错1
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20 50 <type 'tuple'> --------------------------------------------------------------------------- TypeError Traceback (most recent call last) <ipython-input-11-d402c31a1fde> in <module>() 5 6 ##元祖不可改 ----> 7 dims[1] = 30 # 此处会报错 TypeError: 'tuple' object does not support item assignment1
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## 遍历元祖 dims = (10,20,30,40) for dim in dims: print dim1
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10 20 30 401
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## 元祖赋值(注意不同于元祖修改) dims = (10,20,30) print dims dims = (40,50,60) # 此时整个元祖的所有元素被新的元素覆盖 print dims1
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(10, 20, 30) (40, 50, 60)
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