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Python Articles
Page 843 of 855
Prefix sum array in python using accumulate function
Given an array and we have to do the prefix sum array using accumulate function.itertools.accumulate(iterable[, func]) module functions all construct and return iterators. So they should only be accessed by functions or loops that truncate the stream. Make an iterator that returns accumulated sums. Elements may be any addable type including Decimal or Fraction. If the optional function argument is supplied, it should be a function of two arguments and it will be used instead of addition.ExampleInput Data = [1, 0, 2, 3, 5] >>> list(accumulate(data)) # running summation Output [1, 1, 3, 6, 11]AlgorithmStep 1: Create list. Step 2: ...
Read MoreWrite Python program to find duplicate rows in a binary matrix
Given a binary matrix contains 0 and 1, our task is to find duplicate rows and print it.Python provides Counter() method which is used here.ExampleInput: 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 Output: (1, 1, 1, 1) (0, 0, 0, 0)AlgorithmStep 1: Create a binary matrix, only 0 and 1 elements are present. Step 2: Which will have rows as key and it’s frequency as value. Lists are mutable so first, we will cast each row (list) into a tuple. Step 3: Create a dictionary using the counter method. Step 4: ...
Read MorePython program to check whether a given string is Heterogram or not
Here one string is given then our task is to check weather a given string is Heterogram or not.The meaning of heterogram checking is that a word, phrase, or sentence in which no letter of the alphabet occurs more than once. A heterogram may be distinguished from a pangram which uses all of the letters of the alphabet.ExampleString is abc def ghiThis is Heterogram (no alphabet repeated)String is abc bcd dfhThis is not Heterogram. (b, c, d are repeated)AlgorithmStep 1: first we separate out list of all alphabets present in sentence. Step 2: Convert list of alphabets into set because ...
Read MorePython program to find Largest, Smallest, Second Largest, and Second Smallest in a List?
Array is given, we have to find out maximum, minimum, secondlargest, second smallest number.AlgorithmStep 1: input list element Step 2: we take a number and compare it with all other number present in the list. Step 3: get maximum, minimum, secondlargest, second smallest number.Example code# To find largest, smallest, second largest and second smallest in a List def maxmin(A): maxi = A[0] secondsmax = A[0] mini = A[0] secondmini = A[0] for item in A: if item > maxi: maxi ...
Read MorePython code to print common characters of two Strings in alphabetical order
Two user input strings are given, our task is to print all the common characters in alphabetical order.ExampleInput: string1: python string2: program Output: opExplanationThe letters that are common between the two strings are o (1 times), p (1 time)AlgorithmStep 1: first we take two input string. Step 2: next we will do to convert these two strings into counter dictionary. Step 3: Now find common elements between two strings using intersection ( ) property. Step 4: Resultant will also be a counter dictionary having common elements as keys and their common frequencies as value. Step 5: Use elements () method ...
Read MoreHow to replace backward "" slash from a string
In Python it does give the desired result>>> var = "aaa\bbb\ccc and ddd\eee" >>> var.split('') ['aaa', 'bbb', 'ccc and ddd', 'eee']
Read MoreHow i can replace number with string using Python?
For this purpose let us use a dictionary object having digit as key and its word representation as value −dct={'0':'zero', '1':'one', '2':'two', '3':'three', '4':'four', '5':'five', '6':'six', '7':'seven', '8':'eight', '9':'nine'Initializa a new string object newstr=''Using a for loop traverse each character ch from input string at check if it is a digit with the help of isdigit() function. If it is digit, use it as key and find corresponding value from dictionary and append it to newstr. If not append the character ch itself to newstr. Complete code is as follows:string='I have 3 Networking books, 0 Database books, and 8 Programming ...
Read MorePython Regex to extract maximum numeric value from a string
The easiest way to extract the maximum numeric value from a string using regex is to −Use the regex module to extract all the numbers from a stringFind the max from these numbersFor example, for the input string −There are 121005 people in this city, 1587469 in the neighboring city and 18775994 in a far-off city.We should get the output −18775994We can use "\d+" regex to find all numbers in a string as \d signifies a digit and the plus sign finds the longest string of continuous digits. We can implement it using the re package as follows −import re ...
Read MoreHow to emulate a do-while loop in Python?
Python doesn't have an equivalent of do-while loop as in C/C++ or Java. The essence of do-while loop is that the looping condition is verified at the end of looping body. This feature can be emulated by following Python code −Examplecondition=True x=0 while condition==True: x=x+1 print (x) if x>=5: condition=FalseOutputThe output is as follows −1 2 3 4 5
Read MoreWhat does colon ':' operator do in Python?
The : symbol is used for more than one purpose in PythonAs slice operator with sequence −The − operator slices a part from a sequence object such as list, tuple or string. It takes two arguments. First is the index of start of slice and second is index of end of slice. Both operands are optional. If first operand is omitted, it is 0 by default. If second is omitted, it is set to end of sequence.>>> a=[1, 2, 3, 4, 5] >>> a[1:3] [2, 3] >>> a[:3] [1, 2, 3] >>> a[2:] [3, 4, 5] >>> s='computer' >>> s[:3] ...
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