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')) |