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Python: dict() function

dict() function

The dict() function is used to create a new dictionary.

Read more about dictionaries from Python Dictionaries and Python Exercises.

Version:

(Python 3)

Syntax:

dict(**kwarg)
dict(mapping, **kwarg)
dict(iterable, **kwarg)

Example: Create Dictionary Using keyword arguments only

num = dict(a=10, b=0)
print('num = ',num)
print(type(num))

empty = dict()
print('empty = ',empty)
print(type(empty))

Output:

num =  {'b': 0, 'a': 10}

empty =  {}

Example: Create Dictionary Using Iterable

num1 = dict([('a', 3), ('b', -3)])
print('num1 =',num1)

num2 = dict([('a', 3), ('b', -3)], c=5)
print('num2 =',num2)

# zip() creates an iterable in Python 3
num3 = dict(dict(zip(['a', 'b', 'c'], [2, 3, 4])))
print('num3 =',num3)

Output:

num1 = {'a': 3, 'b': -3}
num2 = {'a': 3, 'c': 5, 'b': -3}
num3 = {'a': 2, 'c': 4, 'b': 3} 

Example: Create Dictionary Using Mapping

num1 = dict({'a': 3, 'b': 4})
print('num1 =',num1)

num2 = {'a': 5, 'b': 6}
print('num2 =',num2)

num3 = dict({'a': 7, 'b': 8}, c=9)
print('num3 =',num3)

Output:

num1 = {'a': 3, 'b': 4}
num2 = {'a': 5, 'b': 6}
num3 = {'c': 9, 'a': 7, 'b': 8}

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How do I check if a list is empty?

For example, if passed the following:

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if not a:
  print("List is empty")

Ref: https://bit.ly/2A4JXx9