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Python Articles
Page 841 of 855
Python program to find N largest elements from a list
In this example, we will see how to find the N largest elements from a List. The list is the most versatile datatype available in Python, which can be written as a list of comma-separated values (items) between square brackets. Important thing about a list is that the items in a list need not be of the same type Let’s say the following is the input list − [25, 18, 29, 87, 45, 67, 98, 5, 59] The following is the output displaying the N largest element from the list. Here, N = 3 − [98, 87, 67] ...
Read MoreHow to check if a string is a valid keyword in Python?
To check if a string is a valid keyword, import the keyword module and use the iskeyword() method. With that, you can directly display all the keywords at once and verify. Let’s say the following is our input − else The following is the output. The “else” is a keyword in Python − Keyword Check if a string is a valid keyword in Python Example import keyword # Create a List myList = ["for", "amit", "val", "while"] # Display the List print("List = ", myList) keyword_list = [] non_keyword_list = [] # Looping and ...
Read MoreBinary to decimal and vice-versa in Python
In this article, we will see how to convert Binary to Decimal and Decimal to Binary. Binary is the simplest kind of number system that uses only two digits of 0 and 1 (i.e. value of base 2). Since digital electronics have only these two states (either 0 or 1), so binary number is most preferred in modern computer engineer, networking and communication specialists, and other professionals. Decimal number system has base 10 as it uses 10 digits from 0 to 9. In decimal number system, the successive positions to the left of the decimal point represent units, tens, hundreds, ...
Read MorePython program to convert time from 12 hour to 24 hour format
In this article, we will learn how to convert time from 12 to 24 hours format. Let’s say we have the following input date in 12-hour format − 10:25:30 PM The following is the output in 24-hour format − 22:25:30 Convert current time from 12 hour to 24 hour format To convert time from 12 hour to 24 hour format, here’s the code − Example import datetime def timeconvert(str1): if str1[-2:] == "AM" and str1[:2] == "12": return "00" + str1[2:-2] elif str1[-2:] == "AM": return str1[:-2] elif str1[-2:] == "PM" and str1[:2] == "12": return str1[:-2] ...
Read MorePython program using map function to find row with maximum number of 1's
In this article, we will learn how to use map function to find row with maximum number of 1's. 2D array is given and the elements of the arrays are 0 and 1. All rows are sorted. We have to find row with maximum number of 1's. Here we use map (). The map function is the simplest one among Python built-ins used for functional programming. These tools apply functions to sequences and other iterables. Let’s say the input is the following array − [[0, 1, 1, 1, 1], [0, 0, 1, 1, 1], [1, 1, 1, 1, 1], [0, ...
Read MorePython program to count occurrences of an element in a tuple
We will see how to count occurrences of an element in a Tuple. A tuple is a sequence of immutable Python objects. Let’s say we have the following input, with the occurrences of 20 to be checked − myTuple = (10, 20, 30, 40, 20, 20, 70, 80) The output should be − Number of Occurrences of 20 = 3 Count occurrence of an element in a Tuple using for loop In this example, we will count the occurrences of an element in a Tuple − Example def countFunc(myTuple, a): count = 0 for ele in myTuple: ...
Read MoreMathematical Functions in Python - Special Functions and Constants
In this article, we will learn about special functions and constants available in the math module in the Python Standard Library.Here we will discuss some constants like −pieinfNantauAnd some functions likeGammaIsinfIsnanisfinite()erf()Let's discuss constants and their respective values −pi3.141592…..e2.718281…...inf6.283185…...nantauNow let’s discuss some special functions and their implementation −Gamma − return the value of gamma(n)Isinf − checks whether the value of the function is infinity or not.Isnan − check whether the return value is a number or not.Isfinite − return True if the value is neither an infinity or a nan false otherwiseErf − returns the error function of x.Now let;’s take ...
Read MoreList Methods in Python - in, not in, len(), min(), max()
In this article, we will learn about various types of list methods available to us in Python 3.x. Or earlier. These operators allow us to perform the basic operations on the list content.In & Not in operators“in” operator − This operator is used to check whether an element is present in the passed list or not. Returns true if the element is present in the list otherwise returns false.“not in” operator − This operator is used to check whether an element is not present in the passed list or not. Returns true if the element is not present in the ...
Read MoreIterate over a dictionary in Python
In this article, we will learn about iteration/traversal of a dictionary in Python 3.x. Or earlier.A dictionary is an unordered sequence of key-value pairs. Indices can be of any immutable type and are called keys. This is also specified within curly braces.Method 1 − Using iterables directlyExampledict_inp = {'t':'u', 't':'o', 'r':'i', 'a':'l', 's':'p', 'o':'i', 'n':'t'} # Iterate over the string for value in dict_inp: print(value, end='')OutputtrasonMethod 2 − Using iterables for values of the dictionaryExampledict_inp = {'t':'u', 't':'o', 'r':'i', 'a':'l', 's':'p', 'o':'i', 'n':'t'} # Iterate over the string for value in dict_inp.values(): print(value, end='')OutputoilpitMethod 3 − ...
Read MoreMeasure execution time of small Python code snippets (timeit)
The Timer class and other convenience functions in timeit module of Python's standard library are designed to provide a mechanism to measure time taken by small bits of Python code to execute. The module has a command line interface and the functions can be called from within program as well.Easiest way to measure time of execution is by using following convenience functiontimeit()This function returns object of Timer class. It mainly requires two parameters.stmt − a string containing valid Python statement whose execution time is to be measured.setup − a string containing Python statement which will be executed once, primarily to ...
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