In this tutorial, we will look at how to convert a deque object containing string values to a string in Python with the help of some examples.
deque in Python
collections module in Python comes with a
deque class that you can use to implement a stack or queue data structure in Python. Deques support thread-safe, memory efficient appends and pops from either side of the deque with approximately the same O(1) performance in either direction.
In simple terms, you can think of a
deque in Python as a list-like data structure but with efficient insertion and removal of items from either end (left and right). This makes them very useful when implementing a stack or queue functionality in Python.
How to convert a deque to a string?
You can use the string
join() function to convert a deque with only string values to a single string in Python. The idea is to join the string values in the deque together using an empty string with the
The following is the syntax –
# convert deque of strings to a string "".join(queue)
Note that the above code will raise a
TypeError if any of the values in the deque is not of string type.
Let’s now look at some examples of using the above syntax
Example 1 – Convert a deque of strings to a single string
First, let’s create a deque with some string elements.
from collections import deque # create a deque queue = deque(["a", "b", "c"]) # print the deque print(queue)
deque(['a', 'b', 'c'])
Here, we imported the
deque class from the
collections module and created a deque
queue with some string values.
Let’s now convert the above deque to a single-string value.
# convert deque to string "".join(queue)
Here, we used the string
join() function to concatenate the values in the deque
queue with an empty string.
Example 2 – Convert a deque of numbers to a string
If you apply the string
join() on a deque containing non-string values, you’ll get a
# create a deque queue = deque([1, 2, 3]) # convert deque to string "".join(queue)
--------------------------------------------------------------------------- TypeError Traceback (most recent call last) Input In , in <module> 2 queue = deque([1, 2, 3]) 3 # convert deque to string ----> 4 "".join(queue) TypeError: sequence item 0: expected str instance, int found
To convert a deque of numbers to a single string, you can use a list comprehension to first get values in the deque as strings in a list and then concat them together using the string
# convert deque to string "".join([str(val) for val in queue])
We get the values in the deque as a single string.
You might also be interested in –
- Python – Convert a deque to a list
- Python – Get the Index of the Maximum Value in Deque
- Python – Get the Index of the Minimum Value in Deque
- Python – Get the Maximum and the Minimum Value in a Deque
- Python – Check If a Deque is Empty
- Python – Get Value by Index in Deque
- Python – Count occurrences of a value in deque
- Python – Create a deque copy
- Python – Rotate a Deque to the Right and Left
- Python – Extend deque to the left
- Python – Extend deque to the right
- Python – Get the Max Size of a Deque
- Python – Reverse a deque
- Python – Get Index of a Value in Deque
- Python – Remove Element by Value in Deque
- Python – Remove all elements from a deque (clear deque)
- Python – Append Element to a Deque
- Python – Append Element to the Left in Deque
- Python – Pop Element From Left in Deque
- Python – Pop Element From the End in Deque
- Python – Insert Element at a given Index in Deque
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