day08-- built-in method Summary

List type built-in method

List Properties

Stored value or a plurality of values: a plurality of values

Ordered or disordered: Ordered

Variable or immutable: Variable Data Type

Priority grasp

1. By index value (positive value + antiporter value), may be taken to deposit

   list[0]='a'

2. slice

   list[start:stop:step]

3. Length len

   len ( list )

4. Members and not in operation in

   'a' in 'abc' ==》True

   'a' not in 'abc'==》False

5. Add append

   lis.append(object)

6. Delete del

   the lis

7. cycle

   for i in lis:

   ​ print i

Need to know

1. insert insert

   lis.insert(index,object)

2. pop pop

   lis.pop(index)

   index may be empty, the default value is the last pop

3. remove remove (not being given)

   lis.remove(object)

4. count the number

   lis.count(object)

5. Gets the index index

   lis.index(object,start,stop)

6. clear Clear Array

   lis.clear

7. copy replication (different id)

   lis.copy()

8. extend extension

   lis.extend(iterable)

9. reverse reverse

   lis.resverse()

10. sort sort

    lis.sort(key,reverse)

Tuple built-in method

Tuple property

Is the immutable list

Is defined: a = (); a = tuple ()

Stored value or a plurality of values: a plurality of values

Ordered or disordered: Ordered

Variable or non-variable: immutable data type

Built-in method

Priority grasp

1. Index values

2. Sections (care regardless of the end, step)

3. Length len

4. Members and not in operation in

5. cycle

6. count

7. index

   Use reference list

Dictionary built-in method

Dictionary property

Stored value or a plurality of values: a plurality of values

Ordered or disordered: disordered

Variable or immutable: Variable Data Type

Built-in method

Priority grasp

1. Access key press value: deposit may be desirable

2. Length len

3. Members and not in operation in

4. Delete del

5. Button keys (), the value of values ​​(), on the key-value items ()

   dic.keys()

   dic.values()

   dic.items()

6. (Loop is withdrawn key)

Need to know

1. get Gets

   dic.get(key)

2. update update

   dic.update ( {} key-value pair )

3. fromkeys quickly create a dictionary

   dict.fromkeys([keys],value)

4. setdefault setting default values

   dic.setdefault(key,default)

A collection of built-in method

Stored value or a plurality of values: a plurality of values, the data type is immutable

Ordered or disordered: disordered

Variable or immutable: Variable Data Type

Built-in method

Priority grasp

Length len

Members and not in operation in

| Union, union

& Intersection, intersection

-差集、difference

^ Symmetric difference, symmetric_difference

==

Parent Set:>,> =, issuperset

Subsets: <, <=, issubset

Need to know

1. add
2. remove
3. difference_update
4. discard
5. isdisjoint