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Programming Articles
Page 2520 of 2547
Python Garbage Collector interface (gc)
Automatic garbage collection is one of the important features of Python. Garbage collector mechanism attempts to reclaim memory occupied by objects that are no longer in use by the program.Python uses reference counting mechanism for garbage collection. Python interpreter keeps count of number of times an object is referenced by other objects. When references to an object are removed, the count for an object is decremented. When the reference count becomes zero, the object memory is reclaimed.Normally this mechanism is performed automatically. However, it can be done on purpose if a certain situation arises in the program. The 'gc' module ...
Read MoreFinding modules used by a Python script (modulefinder)
The ModuleFinder class in 'modulefinder' module can determine set of modules imported by a certain script. This module has a command line interface as well as programmatic interface.For demonstration of functionality, use following script#modfinder.py import hello try: import trianglebrowser import nomodule, mymodule except ImportError: passCommand line interfaceFollowing command displays list of modules located as well as not found.E:\python37>python -m modulefinder modfinder.pyOutputName File ---- ---- m __main__ modfinder.py m hello hello.py m math m trianglebrowser trianglebrowser.py Missing modules: ? mymodule imported from __main__ ? nomodule imported from __main__Programmatic interfaceModuleFinder class in ...
Read MoreExploratory Data Analysis in Python
For data analysis, Exploratory Data Analysis (EDA) must be your first step. Exploratory Data Analysis helps us to −To give insight into a data set.Understand the underlying structure.Extract important parameters and relationships that hold between them.Test underlying assumptions.Understanding EDA using sample Data setTo understand EDA using python, we can take the sample data either directly from any website or from your local disk. I’m taking the sample data from the UCI Machine Learning Repository which is publicly available of a red variant of Wine Quality data set and try to grab much insight into the data set using EDA.import pandas ...
Read MoreGeographical plotting using Python plotly
Python provides various libraries to handle geographical and graph data. Python plotly is one of those libraries which are used to draw geographical graphs. Plotly is a free and open source library. Plotly helps to plot various kinds of graphs like Line charts, Horizontal bar charts, bar charts, dashboards, scatter plots, bubble charts, pie charts and many more.# Import important python geographical libraries. import plotly.plotly as py import plotly.graph_objs as go import pandas as pd # Must enable in order to use plotly off-line. from plotly.offline import download_plotlyjs, init_notebook_mode, iplot, plot # To establish connection init_notebook_mode() # type defined is ...
Read MoreImplementation of Dynamic Array in Python
Dynamic ArrayIn python, a list, set and dictionary are mutable objects. While number, string, and tuple are immutable objects. Mutable objects mean that we add/delete items from the list, set or dictionary however, that is not true in case of immutable objects like tuple or strings.In python, a list is a dynamic array. Let's try to create a dynamic list −>>> #Create an empty list, named list1 >>> list1 = [] >>> type (list1) Add some items onto our empty list, list1 −>>> # Add items >>> list1 =[2, 4, 6] >>> list1 [2, 4, 6] >>> # Another way ...
Read MorePython program to print all the numbers divisible by 3 and 5 for a given number
This is a python program to print all the numbers which are divisible by 3 and 5 from a given interger N. There are numerous ways we can write this program except that we need to check if the number is fully divisble by both 3 and 5.Below is my code to write a python program to print all the numbers divisible by 3 and 5 −lower = int(input("Enter lower range limit:")) upper = int(input("Enter upper range limit:")) for i in range(lower, upper+1): if((i%3==0) & (i%5==0)): print(i)OutputEnter lower range limit:0 Enter upper range limit:99 0 15 ...
Read MoreHow to generate byte code file in python
All python program automatically compiles your source code to compile code also called as byte code, before executing it.Whenever we import a module for the first time or when your source file is a new file or we have an updated file then the recently compiled file, a .pyc file will be created on compiling the file in the same directory as the .py file (from python 3- you might see .pyc file is in a subdirectory called __pycache__ instead in the same directory as your .py file). This is a time-saver mechanism as it prevents python to skip the ...
Read MoreWhy is python best suited for Competitive Coding
Competitive programming is generally referred to coding to make use of efficient algorithms using an appropriate data structure. They test the skills of programmers on many levels.With the help of algorithms and data structures, you have to solve a hypothetical programming problem posed to you by applying different logics. You not only have to solve the problem but you have to come up with a very efficient solution, which is having a good time and space complexity.Example of a problem statement for what is called competitive programming might be −You are given a string s of length n consisting only ...
Read MoreReplacing strings with numbers in Python for Data Analysis
Sometimes there is a requirement to convert a string to a number (int/float) in data analysis. For each string, we can assign a unique integer value to differentiate string values.For this, we use the data in Comma Separated Values(CSV) files. Say we have an excel file containing CSV data as follow −CompanyIndustryRecommendationHDFC BankFinanceHoldApolloHealthcareBuyHeroAutomobileUnderperformYes BankFinanceHoldM&MAutomobileUnderperformFortisHealthcareBuyMarutiAutomobileUnderperformAbove is just a few lines from a large dataset, we need to give different recommendation .i.e. Buy, Hold, Underperform etc. integer values, which will link to our metadata. So for the above input, our expected output will be something like −CompanyIndustryRecommendationHDFC BankFinance2ApolloHealthcare1HeroAutomobile3Yes BankFinance2M&MAutomobile3FortisHealthcare1MarutiAutomobile3Here is a way ...
Read MorePrint Colors of terminal in Python
In the terminal, if you want to make some texts appears in colored mode, there are numerous ways in python programming to achieve it.Using python modules1.termcolor module: It is the ANSII Color formatting for output in the terminal.import sys from termcolor import colored, cprint text1 = colored('Hello, Tutorialspoint!', 'blue', attrs=['reverse', 'blink']) print(text1) cprint('Hello, Python!', 'blue', 'on_white') print_red_on_blue = lambda x: cprint(x, 'red', 'on_blue') print_red_on_blue('Hello, from Data Science!') print_red_on_blue('Hello, Python!') for i in range(10): cprint(i, 'green', end=' ') cprint("Attention!", 'blue', attrs=['bold'], file=sys.stderr)Result
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