YouTipPython Func Dict
# Python2.x Python dict() Function
[ Python Built-in Functions](#)
* * *
## Description
The **dict()** function is used to create a dictionary.
## Syntax
dict syntax:
class dict(**kwarg)class dict(mapping, **kwarg)class dict(iterable, **kwarg)
Parameter description:
* **kwargs -- Keywords.
* mapping -- A container of elements. Mapping types are an associative container type that stores the mapping relationship between objects.
* iterable -- An iterable object.
## Return Value
Returns a dictionary.
## Examples
The following examples demonstrate the usage of dict:
>>>dict()# Create an empty dictionary {} >>>dict(a='a', b='b', t='t')# Pass in keywords {'a': 'a', 'b': 'b', 't': 't'} >>>dict(zip(['one', 'two', 'three'], [1, 2, 3]))# Construct dictionary using mapping function {'three': 3, 'two': 2, 'one': 1} >>>dict([('one', 1), ('two', 2), ('three', 3)])# Construct dictionary using iterable object {'three': 3, 'two': 2, 'one': 1} >>>
### Create Dictionary Using Only Keyword Arguments
## Example
numbers =dict(x=5, y=0)
print('numbers =', numbers)
print(type(numbers))
empty =dict()
print('empty =', empty)
print(type(empty))
The output of the above example is:
numbers = {'y': 0, 'x': 5} empty = {}
### Create Dictionary Using Iterable Object
## Example
# No keyword arguments set
numbers1 =dict([('x',5),('y', -5)])
print('numbers1 =',numbers1)
# Keyword arguments set
numbers2 =dict([('x',5),('y', -5)], z=8)
print('numbers2 =',numbers2)
# zip() creates iterable object
numbers3 =dict(dict(zip(['x','y','z'],[1,2,3])))
print('numbers3 =',numbers3)
The output of the above example is:
numbers1 = {'y': -5, 'x': 5} numbers2 = {'z': 8, 'y': -5, 'x': 5} numbers3 = {'z': 3, 'y': 2, 'x': 1}
### Create Dictionary Using Mapping
Mapping types are an associative container type that stores the mapping relationship between objects.
## Example
numbers1 =dict({'x': 4,'y': 5})
print('numbers1 =',numbers1)
# The following code does not need to use dict()
numbers2 ={'x': 4,'y': 5}
print('numbers2 =',numbers2)
# Keyword arguments will be passed
numbers3 =dict({'x': 4,'y': 5}, z=8)
print('numbers3 =',numbers3)
The output of the above example is:
numbers1 = {'x': 4, 'y': 5} numbers2 = {'x': 4, 'y': 5} numbers3 = {'x': 4, 'z': 8, 'y': 5}
[ Python Built-in Functions](#)