Python List+Tuple+Dict+Set小结
创建List:L = [‘Adam‘, ‘Lisa‘, ‘Bart‘, ‘Gechong‘, ‘Kongming‘]
显示List:L[0]
遍历List:print (L)和for循环
更新List:append()和insert()和直接赋值
删除List:pop()和pop(n)
List特点:
可以添加删除
Li = [‘Adam‘, ‘Lisa‘, ‘Bart‘, ‘Gechong‘, ‘Kongming‘] print (Li) for name in Li: print(name)
创建Tuple:Tu = (‘Adam‘, ‘Lisa‘, ‘Bart‘, ‘Gechong‘, ‘Kongming‘)
显示Tuple:Tu[0]
遍历Tuple:print (Tu)和for循环
更新Tuple:不可以更新
删除Tuple:不可以删除
Tuple特点:不可以改变,如果创建之后一个元素的Tuple时,要加","
Tu = (‘Adam‘, ‘Lisa‘, ‘Bart‘, ‘Gechong‘, ‘Kongming‘) print (Tu) for name in Tu: print(name)
创建Dict:Di = {‘Adam‘:100, ‘Lisa‘:90, ‘Bart‘:93, ‘Gechong‘:100, ‘Kongming‘:100}
显示Dict:Di[‘Adam‘]和Di.get(‘Adam‘)
遍历Dict:print(Di)和for循环
Di = {‘Adam‘:100, ‘Lisa‘:90, ‘Bart‘:93, ‘Gechong‘:100, ‘Kongming‘:100} for key in Di: print (key)
Di = {‘Adam‘:100, ‘Lisa‘:90, ‘Bart‘:93, ‘Gechong‘:100, ‘Kongming‘:100} for key in Di: print (Di[key])
更新Dict:对应位置赋值即可
删除Dict:
Dict特点:
1:查找速度快
2:浪费空间
3:key不可以重复,且不可变
4:数据无序排放
创建set:s = set([‘Adam‘, ‘Lisa‘, ‘Bart‘, ‘Gechong‘, ‘Kongming‘])
显示set:
s = set([‘Adam‘, ‘Lisa‘, ‘Bart‘, ‘Gechong‘, ‘Kongming‘]) if ‘Test‘ in s: print (‘Test‘) else: print (‘No‘)
遍历set:print (s)
s = set([‘Adam‘, ‘Lisa‘, ‘Bart‘, ‘Gechong‘, ‘Kongming‘]) for name in s: print (name)
更新set:s.add()
删除set:s.remove()
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