python學習筆記——列表操作

python列表操作——增

append：追加一條數據到列表的最後

name = ["Zhangsan","XiongDa","Lisi"]
name.append("wangwu")
print name
輸出結果：
['Zhangsan', 'XiongDa', 'Lisi', 'wangwu']

insert：指定位置插入一條數據

name = ["Zhangsan","XiongDa","Lisi"]
name.insert(1,"wangwu")    #在下標為1的位置插入一條數據“wangwu”
print name
輸出結果：
['Zhangsan', 'wangwu', 'XiongDa', 'Lisi']

python列表操作——刪

name = ["Zhangsan","XiongDa","Lisi"]
name.remove("Lisi")    #刪除指定的數據
print name
輸出結果：
['Zhangsan', 'XiongDa']

name = ["Zhangsan","XiongDa","Lisi"]
del name[0]    #刪掉下標為0的一條數據
print name
輸出結果：
['XiongDa', 'Lisi']

name = ["Zhangsan","XiongDa","Lisi"]
name.pop()    #刪除最後一條數據
print name
輸出結果：
['Zhangsan', 'XiongDa']

如果當pop()中帶入了參數，其效果等同於del

Name.pop(1) == del name[1]

python列表操作——改

name = ["Zhangsan","XiongDa","Lisi"]
name[1] = "wangwu"
print name
輸出結果：
['Zhangsan', 'wangwu', 'Lisi']

python列表操作——查

name = ["Zhangsan","XiongDa","Lisi","wangwu"]
print(name[1])     #直接取出下標為1的數據
輸出結果：
XiongDa

name = ["Zhangsan","XiongDa","Lisi","wangwu"]
print(name[0:2])   #取出從下標0到下標1的數據，不包括2（顧頭不顧尾）
輸出結果：
['Zhangsan', 'XiongDa']

當下標為負數時，則從右邊開始取

name = ["Zhangsan","XiongDa","Lisi","wangwu"]
print(name[-1])     #直接取出下標為1的數據
輸出結果：
wangwu

name = ["Zhangsan","XiongDa","Lisi","wangwu"]
print(name[-3:-1])   #從倒數第三個開始取，取到倒數第二個，因為不包括-1
輸出結果：
['XiongDa', 'Lisi']

name = ["Zhangsan","XiongDa","Lisi","wangwu"]
print(name[-3:])   #從倒數第三個開始取，取到倒數第一個
輸出結果：
['XiongDa', 'Lisi', 'wangwu']
同理從左邊開始取時
name[0:3] == name[:3]

列表其他操作：

name = ["Zhangsan","XiongDa","Lisi","wangwu","Lisi"]
name.count("Lisi")  #統計Lisi出現的次數
name.clear()         #清空數據
name.reverse()       #反轉列表
name.sort()           #正向排序
name2 = ["1","2"]
name.extend(name2)  #兩個數組合併，name2放在後面