Is there a difference between using a dict literal and a dict constructor?

Question

Using PyCharm, I noticed it offers to convert a dict literal:

d = {
    \'one\': \'1\',
    \'two\': \'2\',
}

Answer 1

From python 2.7 tutorial:

A pair of braces creates an empty dictionary: {}. Placing a comma-separated list of key:value pairs within the braces adds initial key:value pairs to the dictionary; this is also the way dictionaries are written on output.

tel = {'jack': 4098, 'sape': 4139}
data = {k:v for k,v in zip(xrange(10), xrange(10,20))}

While:

The dict() constructor builds dictionaries directly from lists of key-value pairs stored as tuples. When the pairs form a pattern, list comprehensions can compactly specify the key-value list.

tel = dict([('sape', 4139), ('guido', 4127), ('jack', 4098)]) {'sape': 4139, 'jack': 4098, 'guido': 4127}
data = dict((k,v) for k,v in zip(xrange(10), xrange(10,20)))

When the keys are simple strings, it is sometimes easier to specify pairs using keyword arguments:

dict(sape=4139, guido=4127, jack=4098)
>>>  {'sape': 4139, 'jack':4098, 'guido': 4127}

So both {} and dict() produce dictionary but provide a bit different ways of dictionary data initialization.