Amazing hacks of Python - GeeksforGeeks

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

Cool Zip tricks

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)
```
Output:
Geeeeekkkkss
```

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 contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

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