Python dict() Function
Python Built-in FunctionsDescription
dict()The 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 mapping relationships between objects.
- iterable -- an iterable object.
Return Value
Return 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 keyword arguments
{'a': 'a', 'b': 'b', 't': 't'}
>>> dict(zip(['one', 'two', 'three'], [1, 2, 3])) # Construct a dictionary using the mapping function method
{'three': 3, 'two': 2, 'one': 1}
>>> dict([('one', 1), ('two', 2), ('three', 3)]) # Construct a dictionary using the iterable object method
{'three': 3, 'two': 2, 'one': 1}
>>>
Create a dictionary using only keyword arguments
Examples
numbers = dict(x=5, y=0)
print('numbers =', numbers)
print(type(numbers))
empty = dict()
print('empty =', empty)
print(type(empty))
print('numbers =', numbers)
print(type(numbers))
empty = dict()
print('empty =', empty)
print(type(empty))
The output of the above examples is:
numbers = {'y': 0, 'x': 5}
<class 'dict'>
empty = {}
<class 'dict'>
Create a dictionary using an iterable object
Examples
# No keyword arguments set
numbers1 = dict([('x', 5), ('y', -5)])
print('numbers1 =',numbers1)
# Set keyword arguments
numbers2 = dict([('x', 5), ('y', -5)], z=8)
print('numbers2 =',numbers2)
# Use zip() to create an iterable object
numbers3 = dict(dict(zip(['x', 'y', 'z'], [1, 2, 3])))
print('numbers3 =',numbers3)
numbers1 = dict([('x', 5), ('y', -5)])
print('numbers1 =',numbers1)
# Set keyword arguments
numbers2 = dict([('x', 5), ('y', -5)], z=8)
print('numbers2 =',numbers2)
# Use zip() to create an iterable object
numbers3 = dict(dict(zip(['x', 'y', 'z'], [1, 2, 3])))
print('numbers3 =',numbers3)
The output of the above examples is:
numbers1 = {'y': -5, 'x': 5}
numbers2 = {'z': 8, 'y': -5, 'x': 5}
numbers3 = {'z': 3, 'y': 2, 'x': 1}
Create a dictionary using a mapping
Mapping types are an associative container type that stores mapping relationships between objects.
Examples
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)
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 examples is:
numbers1 = {'x': 4, 'y': 5}
numbers2 = {'x': 4, 'y': 5}
numbers3 = {'x': 4, 'z': 8, 'y': 5}
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