10 Interesting Python Cool Tricks

In python we can return multiple values –

1. It’s very unique feature of Python that returns multiple value at time.

   def GFG():
       g = 1
       f = 2
       return g, f
   
   x, y = GFG()
   print(x, y)
   Output:

   (1, 2)
   

2. Allows Negative Indexing: Python allows negative indexing for its sequences. Index -1 refer to the last element, -2 second last element and so on.

   my_list = ['geeks', 'practice', 'contribute']
   print(my_list[-1])
   Output:

   contribute
   

3. Combining Multiple Strings. We can easily concatenate all the tokens available in the list.

   my_list = ['geeks', 'for', 'geeks']
   print(''.join(my_list))
   Output:

   geeksforgeeks
   

4. Swapping is as easy as none.

   See, How we could swap two object in Python.

   x = 1
   y = 2
   
   print('Before Swapping')
   print(x, y)
   
   x, y = y, x
   print('After Swapping')
   print(x, y)
   Output:

   Before Swapping
   (1, 2)
   After Swapping
   (2, 1)
   

5. Want to create file server in Python
   We can easily do this just by using below code of line.

   python -m SimpleHTTPServer # default port 8080

   You can access your file server from the connected device in same network.

6. Want to know about Python version you are using(Just by doing some coding). Use below lines of Code –

   import sys
   print("My Python version Number: {}".format(sys.version))
   Output:

   My Python version Number: 2.7.12 (default, Nov 12 2018, 14:36:49) 
   [GCC 5.4.0 20160609]
   

   It prints version you are using.

7. Store all values of List in new separate variables.

   a = [1, 2, 3]
   x, y, z = a
   print(x)
   print(y)
   print(z)
   Output:

   1
   2
   3
   

8. Convert nested list into one list, just by using Itertools one line of code. Example – [[1, 2], [3, 4], [5, 6]] should be converted into [1, 2, 3, 4, 5, 6]

   import itertools
   a = [[1, 2], [3, 4], [5, 6]]
   print(list(itertools.chain.from_iterable(a)))
   Output:

   [1, 2, 3, 4, 5, 6]
   

9. Want to transpose a Matrix. Just use zip to do that.

   matrix = [[1, 2, 3], [4, 5, 6]]
   print(zip(*matrix))
   Output:

   [(1, 4), (2, 5), (3, 6)]
   

10. Want to declare some small function, but not using conventional way of declaring. Use lambda. The lambda keyword in python provides shortcut for declare anonymous function.

    subtract = lambda x, y : x-y
    subtract(5, 4)