Python Basic Learning Notes (eight) common dictionary built-in functions and methods

Resources:

1. Basic Python Tutorial

2. http://www.runoob.com/python/python-dictionary.html

3. http://www.liaoxuefeng.com/wiki/001374738125095c955c1e6d8bb493182103fac9270762a000

Built-in functions for common operations dictionaries:

Serial Number	functions and descriptions
1	CMP (Dict1, DICT2) Compares two dictionary elements.
2	Len (dict) Calculates the number of dictionary elements, that is, the total number of keys.
3	STR (DICT) The output dictionary is a printable string representation.
4	Type (variable) Returns the type of the variable entered and returns the dictionary type if the variable is a dictionary.

Common dictionary self-bringing method:

Serial Number	functions and descriptions
1	Radiansdict.clear () Delete all elements in a dictionary
2	Radiansdict.copy () Returns a shallow copy of a dictionary
3	Radiansdict.fromkeys () Create a new dictionary with the keys to the dictionary in sequence seq, Val is the initial value corresponding to all keys in the dictionary
4	Radiansdict.get (Key, Default=none) Returns the value of the specified key if the value does not return the default value in the dictionary
5	Radiansdict.has_key (Key) Returns False if the key returns true in the dictionary Dict
6	Radiansdict.items () Returns an array of traversed (key, value) tuples as a list
7	Radiansdict.keys () Returns a dictionary of all keys in a list
8	Radiansdict.setdefault (Key, Default=none) Similar to get (), but if the key does not already exist in the dictionary, the key will be added and the value will be set to default
9	Radiansdict.update (DICT2) Update the key/value pairs of the dictionary dict2 to the Dict
10	Radiansdict.values () Returns all values in the dictionary as a list

Python Basic Learning Notes (eight) common dictionary built-in functions and methods