7.18 part of the container built-in method of learning

7.18 part of the container built-in method of learning

dictionary

1. Role: value too easy to keep a list, use a dictionary to take trouble

2. Defined method:

dic = {
'name':'nick'，
'height':180，
'weight':140，
'hobby_list':['read'，'run'，'music'，'fishing'，'programming'，'coding'，'debugging']
}

for k，v in dic():
    print(k，v)

eg: basic use:

wzh = {'name':'wangzhihui','age':18,'sex':'nan','height':201,'hobby':['sing','dance','rap','basketball']}
print(wzh.get('hobby')[3])
print(wzh['name'])
print(wzh.items()) ## 获取键值对
print(wzh.keys())  ## 获取关键字
print(wzh.values())  ## 获取值

Dictionary part built-in method

1. method

   1. Priority grasp
      1. Key Value
      2. length
      3. keys/values/items
      4. for loop
      5. Member operator
   2. Need to know
      1. pop: Removing elements
      2. fromkeys: generating a list of a dictionary, the default value None
      3. setdefault: There does not change the specified key value; no specified key value is changed
      4. get: Gets a value by key, no key default fetch None
      5. update: Extended Dictionary
      6. del: delete key-value pairs dictionary
2. Value of a plurality of values ​​or: a plurality of values
3. Ordered or disordered: disordered

4. Variable or immutable: variable

List

Is defined by: a plurality of spaced apart elements of any data type comma in []

friends_list = ['longzeluola'，'canglaoshi'，'qiaobenai'，'nick']
lis = list('abcd')

A list of built-in method

1. method:
   1. Priority grasp
      1. Index value (in turn can take change)
      2. slice
      3. length
      4. append
      5. Member operator
      6. for loop
   2. Need to know
      1. count: Count the number of elements
      2. remove: remove elements
      3. reverse: reverse list
      4. pop: Removing elements
      5. insert: insert elements
      6. sort: sort the list
      7. index: Index element
      8. del: remove elements
      9. extend: an extended list
      10. clear: Clears the list
2. Value of a plurality of values ​​or: a plurality of values
3. Ordered or disordered: Ordered
4. Variable or immutable: variable

Tuple

1. Role: similar to the list, you can not keep taking
2. Defined method:

friends_tuple = ('longzeluola'，'canglaoshi'，'qiaobenai'，'nick')
tup = tuple('abcd')

Built-in methods tuple

1. method
   1. Priority grasp
      1. Index values ​​(can not be changed)
      2. slice
      3. length
      4. Member operator
      5. for loop
      6. count: Count the number of elements
      7. index: the index element position
2. Value of a plurality of values ​​or: a plurality of values
3. Ordered or disordered: Ordered
4. Variable or immutable: immutable variable that says no

set

1. Action: a plurality of stored values ​​to be set between the operation
2. Defined method:

s1 = {'nick','wuhao','rocky','owen','all is dsb','right'}
s1.add('nmsl')
s1.discard('right')
 print(s1)

A collection of built-in method

1. method:
   1. Priority grasp
      1. Deduplication
      2. Union |
      3. Intersection &
      4. Difference set -
      5. Symmetric difference ^
      6. Superset> emsp &;> =
      7. 子集 <&emsp；<=
      8. ==
   2. Need to know
      1. add: add an element
      2. difference_update: update the elements of the collection not
      3. isdisjoint: If the two elements of the intersection is empty return True, otherwise False
      4. remove: Removes the element does not exist error value #
      5. discard: remove elements not being given #
2. Value of a plurality of values ​​or: a plurality of values
3. Ordered or disordered: disordered
4. Variable or immutable: variable