These are 10 awesome python tricks that will really increase your Python knowledge and these can be handy for an interview as well, so make sure you go through them.
Trick #1
Reversing a string in Python
>>> a = "codementor"
>>> print "Reverse is",a[::-1]
Reverse is rotnemedoc
Trick #2
Transposing a Matrix
>>> mat = [[1, 2, 3], [4, 5, 6]]
>>> zip(*mat)
[(1, 4), (2, 5), (3, 6)]
Trick #3
a = [1,2,3]
Store all three values of the list in 3 new variables
>>> a = [1, 2, 3]
>>> x, y, z = a
>>> x
1
>>> y
2
>>> z
3
Trick #4
a = ["Code", "mentor", "Python", "Developer"]
Create a single string from all the elements in list above.
>>> print " ".join(a)
Code mentor Python Developer
Trick #5
List 1 = ['a', 'b', 'c', 'd']
List 2 = ['p', 'q', 'r', 's']
Write a Python code to print
- ap
- bq
- cr
- ds
>>> for x, y in zip(list1,list2):
... print x, y
...
a p
b q
c r
d s
Trick #6
Swap two numbers with one line of code.
a,b = b,a
Trick #7
Print "codecodecodecode mentormentormentormentormentor" without using loops
>>> print "code"*4+' '+"mentor"*5
codecodecodecode mentormentormentormentormentor
Trick #8
a = [[1, 2], [3, 4], [5, 6]]
Convert it to a single list without using any loops.
Output:- [1, 2, 3, 4, 5, 6]
>>> import itertools
>>> list(itertools.chain.from_iterable(a))
[1, 2, 3, 4, 5, 6]
Trick #9
Checking if two words are anagrams
def is_anagram(word1, word2):
"""Checks whether the words are anagrams.
word1: string
word2: string
returns: boolean
"""
from collections import Counter
def is_anagram(str1, str2):
return Counter(str1) == Counter(str2)
>>> is_anagram('abcd','dbca')
True
>>> is_anagram('abcd','dbaa')
False
Trick #10.
Taking a string input.
For example "1 2 3 4" and return [1, 2, 3, 4]
Remember list being returned has integers in it.
Don't use more than one line of code.
>>> result = map(lambda x:int(x) ,raw_input().split())
1 2 3 4
>>> result
[1, 2, 3, 4]