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Python Articles
Page 794 of 852
Python Context Manager Types
In python, the runtime context is supported by the with statement. The context is defined by the context manager. Using the context manager, we can create user defined classes to define the runtime context. It enters into the task before executing the statement body, and when the statement body is completed, it ends.There are two different methods for context manager. These methods are −Method __enter__()The __enter__() method is used to enter into the runtime context. It will return either the current object or another related object. The returned value is bound to the identifier in as clause of the with ...
Read MoreIterate over lines from multiple input streams in Python
Python’s built-in open() function opens one file in read/write mode and read/write operations on it. To perform processing on multiple files in a batch, one has to use fileinput module of Python’s standard library. This module provides a Fileinput class with functionality of iterating over files. The module also defines helper functions for the same purpose.Primary interface to this module is input() function. This function returns instance of Fileinput class.fileinput.input(files, inplace, mode)The files parameter is name of one or more files to be read one by one. Each file acts as a generator and using a for loop it can ...
Read MoreRandom access to text lines in Python (linecache)
Purpose of linecache module in Python’s standard library is to facilitate random access to any text file, although this module is extensively used by Python’s traceback module to generate error trace stack. Further prettyprints of reading are held in a cache so that it saves time while reading lines repeatedly.The most important function in this module is getline() which reads a specified line number from given file. Following is the list of functions −getline(file, x)This function returns xth line from file. If not present it will return empty string. If the file is not present in current path, function ties ...
Read MoreFile and Directory Comparisons in Python
Python’s standard library has filecmp module that defines functions for comparison of files and directories. This comparison takes into consideration the properties of files in addition to data in them.Example codes in this article use following file and directory structure.Two directories dir1 and dir2 are first created under current working directory. They contain following files.--dir1/newfile.txt-- This is a file in dir1 --dir1/file1.txt-- Hello Python --dir1/file2.txt-- Python Standard Library --dir2/file1.txt-- Hello Python --dir2/file2.txt-- Python LibraryLet us now describe various comparison functions in filecmp module.filecmp.cmp(f1, f2, shallow=True)This function compares the two files and returns True if they are identical, False otherwise. The ...
Read MorePrefix 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 MoreCan someone help me fix this Python Program?
The first problem u are getting in the bold portion is due to non-indent block, put one indentation there.second problem is name variable is not definedfollowing is the corrected one -print ("Come-on in. Need help with any bags?") bag=input ('(1) Yes please (2) Nah, thanks (3) Ill get em later TYPE THE NUMBER ONLY') if bag == ('1'): print ("Ok, ill be right there!") if bag == ('2'): print ("Okee, see ya inside. Heh, how rude of me? I'm Daniel by the way, ya?") name="Daniel" print (name + ": Um, Names " + name) print ("Dan: K, nice too ...
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 ...
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