Python is indeed one of the smart and most trending language. Here are some cool hacks that makes a python superb among all other languages.
- List comprehensions: List comprehension is best and efficient technique to get rid of writing unnecessary lines of code. Read Article to know more.
- Printing a list: List are not printed according the user requirement. They are always printed in unwanted square brackets and single quotes. But there is trivial solution to print the list efficiently by using the string’s join method.
The join method turns the list into a string by casting each item into a string and connecting them with the string that join was called on.
# Declaring the list geek geek = ['Geeks', 'Programming', 'Algorithm', 'Article'] # Directly printing the list print ("Simple List:", geek) # Printing the list by join method print ('List by using join method: %s' % ', ' .join(geek)) # Direct use of join method print ('Direct apply the join method:',(", " .join(geek)))
Output: Simple List: ['Geeks', 'Programming', 'Algorithm', 'Article'] List by using join method: Geeks, Programming, Algorithm, Article Direct apply the join method: Geeks, Programming, Algorithm, Article
- Transpose a matrix: You can Read Here about this.
- Partition a list into N groups: We used iter() as an iterator over a sequence.
# Declaring the list geek geek = ['Sun', 'Flowers', 'Peoples', 'Animals', 'Day', 'Night'] # In python 2.7, just remove the list keyword partition = list(zip (*[iter(geek)] * 2)) print (partition)
Output: [('Sun', 'Flowers'), ('Peoples', 'Animals'), ('Day', 'Night')]
Explanation: [iter(geek)] * 2 produces a list containing 2 items of geek list, i.e. a list of length 2. *arg unpacks a sequence into arguments for a function call. Therefore we are passing the same iterator 2 times to zip().
- Printing more than one list’s items simultaneously
list1 = [1, 3, 5, 7] list2 = [2, 4, 6, 8] # Here zip() function takes two equal length list and merges them # together in pairs for a, b in zip(list1,list2): print (a, b)
Output: 1 2 3 4 5 6 7 8
- Take the string as input and convert it into list:
#In Python 2.7 replace input() to raw_input() # Reads a string from input and type case them to int # after splitting to white-spaces formatted_list = list(map(int, input().split())) print(formatted_list)
Input: 2 4 5 6 Output: [2, 4, 5, 6]
- Convert list of list into single list
# import the itertools import itertools # Declaring the list geek geek = [[1, 2], [3, 4], [5, 6]] # chain.from_iterable() function returns the elements of nested list # and iterate from first list of iterable till the last # end of the list lst = list(itertools.chain.from_iterable(geek)) print(lst)
Output: [1, 2, 3, 4, 5, 6]
- Printing the repeated characters: Task is to print the pattern like this Geeeeekkkkss. So we can easily print this pattern without using for loop.
# + used for string concatenation # To repeat the character n times, just multiply n # with that character print ("G" + "e"*5 + "k"*4 + "s"*2)
Cool Zip tricks
Read More: 10 interesting facts about Python
This article is contributed by Shubham Bansal. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to firstname.lastname@example.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.
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