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Python Articles
Page 796 of 855
Find the minimum difference between Shifted tables of two numbers in Python
Suppose we have two numbers p and q, we have to find the minimum difference between any terms in the shifted infinite tables of p and q, these shifts are r and s, where r, s >= 0.So, if the input is like p = 7 and q = 17, r = 6 and s = 3, then the output will be 0 as, table of 7 = [7, 14, 21, 28, 35, 42, 49, ...] and table of 17 = [17, 34, 51, 68, 85, 102, 119, ...], then shifted table of 7 will be [13, 20, 27, 34, ...
Read MoreFind the maximum number of composite summands of a number in Python
Suppose we have a given number N that in range (1= j and table[i - j] != -1): table[i] = max(table[i], table[i - j] + 1) return table def max_summ(table, n): if (n < max_val): return table[n] else: t = int((n - max_val) / 4)+ 1 return t + table[n - 4 * t] n = 16 table = pre_calc() print(max_summ(table, n))Input16Output4
Read MoreFind Shortest distance from a guard in a Bankin Python
Suppose we have a matrix that is filled with three letters 'O', 'G', and 'W' where 'O' is representing open space, 'G' is representing guards and 'W' is representing walls in a bank, we have to replace all of the O's in the matrix with respect of their shortest distance from one guard, we cannot go through any walls. In the output matrix guards are replaced with 0 and walls are replaced by -1.So, if the input is likeOOOOGOOOWOOWOOOGWWWOOOOOGthen the output will be33210233-111-14320-1-1-1112210To solve this, we will follow these steps −M := 5N := 5dir_row := [-1, 0, 1, 0]dir_col ...
Read MorePython - Write multiple files data to master file
File handling is an important part of any web application.Python has several functions for creating, reading, updating, and deleting files.To write to an existing file, you must add a parameter to the open()function −"a" − Append − will append to the end of the file"w" − Write − will overwrite any existing contentExampleimport os # list the files in directory lis = os.listdir('D:\python' '\data_files\data_files') print(lis) tgt = os.listdir('D:\python' '\data_files\target_file') file_dir ='D:\python\data_files\data_files' out_file = r'D:\python\data_files\target_file\master.txt' ct = 0 print('target file :', tgt) try: # check for if file exists # if yes delete the file # otherwise ...
Read MorePython - Working with .docx module
Word documents contain formatted text wrapped within three object levels. Lowest level- Run objects, Middle level- Paragraph objects and Highest level- Document object.So, we cannot work with these documents using normal text editors. But we can manipulate these word documents in python using the python-docx module.The first step is to install this third-party module python-docx. You can use pip “pip install python-docx”After installation import “docx” NOT “python-docx”.Use “docx.Document” class to start working with the word document.Example# import docx NOT python-docx import docx # create an instance of a word document doc = docx.Document() # add a heading of level 0 ...
Read MorePython - Ways to merge strings into list
While developing an application, there come many scenarios when we need to operate on the string and convert it as some mutable data structure, say list.Example# Importing ast library import ast # Initialization of strings str1 ="'Python', 'for', 'fun'" str2 ="'vishesh', 'ved'" str3 ="'Programmer'" # Initialization of list list = [] # Extending into single list for x in (str1, str2, str3): list.extend(ast.literal_eval(x)) # printing output print(list) # using eval # Initialization of strings str1 ="['python, 'for', ''fun']" str2 ="['vishesh', 'ved']" str3 ="['programmer']" out = [str1, str2, str3] out = eval('+'.join(out)) # printing output print(out)
Read MorePython - Ways to iterate tuple list of lists
List is an important container and used almost in every code of day-day programming as well as web-development, more it is used, more is the requirement to master it and hence knowledge of its operations is necessary.Example# using itertools.ziplongest # import library from itertools import zip_longest # initialising listoflist test_list = [ [('11'), ('12'), ('13')], [('21'), ('22'), ('23')], [('31'), ('32'), ('33')] ] # printing intial list print ("Initial List = ", test_list) # iterate list tuples list of list into single list res_list = [item for my_list in zip_longest(*test_list) for item in my_list if ...
Read MorePython - Using variable outside and inside the class and method
Python is an object-oriented programming language. Almost everything in Python is an object, with its properties and methods. A Class is like an object constructor, or a "blueprint" for creating objects.The variables that are defined outside the class can be accessed by any class or any methods in the class by just writing the variable name.Example# defined outside the class' # Variable defined outside the class. outVar = 'outside_class' print("Outside_class1", outVar) ''' Class one ''' class Ctest: print("Outside_class2", outVar) def access_method(self): print("Outside_class3", outVar) # Calling method by creating object uac = Ctest() uac.access_method() ...
Read MorePython - Plotting Radar charts in excel sheet using XlsxWriter module
A radar chart is a graphical method of displaying multivariate data in the form of a two-dimensional chart of three or more quantitative variables represented on axes starting from the same point.Example# import xlsxwriter module import xlsxwriter # Workbook() takes one, non-optional, argument which is the filename #that we want to create. workbook = xlsxwriter.Workbook('chart_radar1.xlsx') # The workbook object is then used to add new worksheet via the #add_worksheet() method. worksheet = workbook.add_worksheet() # Create a new Format object to formats cells in worksheets using #add_format() method . # here we create bold format object . bold = workbook.add_format({'bold': 1}) ...
Read MorePython - Plotting an Excel chart with pattern fills in column using XlsxWriter module
Charts are composed of at least one series of one or more data points. Series themselves are comprised of references to cell ranges. For plotting the charts on an excel sheet, firstly, create chart object of specific chart type( i.e Column chart etc.). After creating chart objects, insert data in it and lastly, add that chart object in the sheet object.Example# import xlsxwriter module import xlsxwriter #Workbook()takes one, non-optional, argument which is the filename #that we want to create. workbook = xlsxwriter.Workbook('chart_pattern.xlsx') # The workbook object is then used to add new worksheet via the #add_worksheet() method. worksheet = workbook.add_worksheet() ...
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