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
)
Output: Geeeeekkkkss
Read More: 10 interesting facts about Python
Reference: https://www.quora.com/What-are-some-cool-Python-tricksPlease write comments if you find anything incorrect, or you want to share more information about the topic discussed above.
This article is attributed to GeeksforGeeks.org
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- Take the string as input and convert it into list:
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