How to check queue length in Python

Question

How to check Queue s length in python   I dont see they provide Queue lenght in python      http   docs python org tutorial datastructures html  from collections import deque queue   deque   Eric    John    Michael      how to check the length of this queue   and can we initialize like   queue  deque        is this length 0 queue

User · Accepted Answer

len queue  should give you the result  3 in this case   Specifically  len object  function will call object   len   method  reference link   And the object in this case is deque  which implements   len   method  you can see it by dir deque       queue  deque        is this length 0 queue    Yes it will be 0 for empty deque

User · Answer

it is simple just use  qsize   example   a Queue   a put  abcdef   print a qsize    prints 1 which is the size of queue   The above snippet applies for Queue   class of python  Thanks  rayryeng for the update   for deque from collections we can use len   as stated here by K Z

User · Answer

Yes we can check the length of queue object created from collections   from collections import deque class Queue        def   init   self batchSize 32            self batchSie   batchSize         self  queue   deque maxlen batchSize       def enqueue self  items               Appending the items to the queue            self  queue append items       def dequeue self              remoe the items from the top if the queue becomes full             return self  queue popleft     Creating an object of class  q   Queue batchSize 64  q enqueue  1 2   q enqueue  2 3   q enqueue  1 4   q enqueue  1 22     Now retrieving the length of the queue    check the len of queue print len q  queue     you can print the content of the queue print q  queue   Can check the content of the queue print q dequeue     Check the length of retrieved item  print len q dequeue       check the results in attached screen shot     Hope this helps

User · Answer

Use queue rear 1 to get the length of the queue

[python] How to check queue length in Python

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