列表字典内置方法

Posted 2022-09-19 maqiaobin

列表内置方法：只能给列表用

lt = [1, 2, 3，4]

方法	代码
索引取值/索引修改值	lt[0] = 2 print(lt)
索引切片	print(lt[0:1])
成员运算in/not in	print(2 in lt) print(2 not in lt)
for循环	for i in lt：print（i）
len长度	print(len(lt))
append():追加值	lt.append(4) print(lt)
sort():排序	lt.sort() print(lt)
reverse():反转	lt = [1, 2, 3]lt.reverse()print(lt)
index():获取元素索引	print(lt.index(2))
clear():清空列表	lt.clear() print(lt)
copy():复制	lt = [1, 2, 3] lt1 = lt.copy() print(lt1)
extend():扩展列表	lt1 = [1, 2, 3] lt2 = [1, 5, 6] lt1.extend(lt2) print(lt1)
remove(): 移除	lt = [1, 2, 3] lt.remove(3) print(lt)
insert():按照索引插入值	lt = [1, 2, 3] lt.insert(0, 1.5) print(lt)

字典内置方法

banzhuren_info_dic = 'name': 'a', 'height': 21313, 'weight': 1231,                      'hobby_list': ['sdfsdf', 'ads', 'qrt']

方法	代码
按key取值	print(banzhuren_info_dic[‘height‘])
按key修改值	banzhuren_info_dic[‘height‘] = banzhuren_info_dic[‘height‘] + 1 print(banzhuren_info_dic[‘height‘])banzhuren_info_dic[‘age‘] = 30
按key增加值	anzhuren_info_dic[‘age‘] = 30 print(banzhuren_info_dic)
成员运算(比较的是key)	print(‘age‘ in banzhuren_info_dic)
for循环(对key循环)	for i in banzhuren_info_dic: print(i)
keys()	print(banzhuren_info_dic.keys())
values()	print(banzhuren_info_dic.values())
items()	print(banzhuren_info_dic.items())
get()： 取值	print(banzhuren_info_dic.get(‘height‘, 150))
update()	dic1 = ‘a‘:1 dic2 = ‘b‘:2 dic1.update(dic2) print(dic1)
setdefault():	dic1 = ‘a‘: 1 dic1.setdefault(‘a‘, 2) print(dic1)

s='nbx qwer'

方法	代码
索引取值	print(s[0])
切片	print(s[0:4])
成员运算	print(‘nbx‘ in s) print(‘nbx1‘ in s)
for循环	for i in s: print(i)
len()	print(len(s))
strip()	print(s.strip(‘n* ‘))
lstrip()/rstrip()	同上
find()/index()	s = ‘nick‘print(s.find(‘a‘))
join()	print(‘*‘.join([‘a‘, ‘b‘, ‘c‘]))
split()	s = ‘abc‘ print(s.split(‘*‘))
center/ljust/rjust	print(s.center(50, ‘-‘))
isdigit()/isalpha()	s = ‘a‘print(s.isdigit()) print(s.isalpha())#判断是否纯
count()	s = ‘nick nick‘ print(s.count(‘nick‘))