A Python bytestring is a sequence of bytes. In Python 3, bytestrings are represented using the "bytes" data type. Bytestrings are used to represent binary data that doesn't fit into the Unicode character set, such as images, audio, and video files. Here are some code examples that demonstrate working with Python bytestrings: Creating a bytestring To create a bytestring in Python, we can use the "b" prefix before a string literal. Example In this example, we create a bytestring with the contents "This is a bytestring." and assign it to the variable "bytestring". We then print the bytestring to ... Read More

To wrap a string in a file in Python, you can follow these steps: Open a file in write mode using the open() function and assign it to a variable. Call the write() function on the file variable and pass the string you want to wrap as an argument. This will write the string to the file. Close the file using the close() function to ensure that the file is properly saved. Here is an example code snippet that demonstrates how to wrap a string in a file: Opening file in write mode Example In the following code, we are ... Read More

There are two ways to go about replacing \ with \ or unescaping backslash escaped strings in Python. First is using literal_eval to evaluate the string. Note that in this method you need to surround the string in another layer of quotes. For example:>>> import ast >>> a = '"Hello,world"' >>> print ast.literal_eval(a) Hello, worldAnother way is to use the decode('string_escape') method from the string class. For example,>>> print "Hello,world".decode('string_escape') Hello, world

This type of sort in which you want to sort on the basis of numbers within string is called natural sort or human sort. For example, if you have the text:['Hello1', 'Hello12', 'Hello29', 'Hello2', 'Hello17', 'Hello25'] Then you want the sorted list to be:['Hello1', 'Hello2', 'Hello12', 'Hello17', 'Hello25', 'Hello29'] and not:['Hello1', 'Hello12', 'Hello17', 'Hello2', 'Hello25', 'Hello29'] To do this we can use the extra parameter that sort() uses. This is a function that is called to calculate the key from the entry in the list. We use regex to extract the number from the string and sort on both text and number.  import re ... Read More

This problem can be solved by reversing the string, reversing the string to be replaced, replacing the string with reverse of string to be replaced with and finally reversing the string to get the result. You can reverse strings by simple slicing notation - [::-1]. To replace the string you can use str.replace(old, new, count). For example,  def rreplace(s, old, new):     return (s[::-1].replace(old[::-1], new[::-1], 1))[::-1]  rreplace('Helloworld, hello world, hello world', 'hello', 'hi') This will give the output:'Hello world, hello world, hi world'Another method by which you can do this is to reverse split the string once on the old string ... Read More

A string is a collection of characters that can represent a single word or a whole sentence. Unlike Java there is no need to declare Python strings explicitly we can directly assign string value to a literal. A string in Python is represented by a string class which provides several functions and methods using which you can perform various operations on strings. In this article, we are going to find out how to test if a string starts with a capital letter using Python. Using isupper() method One way to achieve this is using the inbuilt string method isupper(). We ... Read More

A string is a collection of characters stored as a single value. Un like other technologies there is no need to explicitly declare strings in python (for that matter any variable), you just need to assign strings to a literal this makes Python strings easy to use. In Python, a string is represented by the class named String. This class provides several functions and methods using which you can perform various operations on strings. In this article, we are going to find out how to check whether a string starts with XYZ in Python. Using startswith() method One way to ... Read More

A string is a collection of characters that can represent a single word or a whole sentence. Unlike Java there is no need to declare Python strings explicitly we can directly assign string value to a literal. A string in Python is represented by a string class which provides several functions and methods using which you can perform various operations on strings. In this article, we are going to find out how to wrap long lines in Python. Using parenthesized line breaks One way to achieve this is by using parenthesized line breaks. Using Python's inferred line continuation within parentheses, ... Read More

In Python 3, the input() function always returns a string, even if the user enters a number. To check if the user input is an integer, you can use a try-except block and attempt to convert the input string to an integer using the int() function. Here are some code examples that demonstrate different ways to check if raw input is an integer in Python 3: Using a try-except block Example In this example, we use a try-except block to attempt to convert the user's input to an integer using the int() function. If the user enters an integer, the ... Read More

% is a string formatting operator or interpolation operator. Given format % values (where format is a string), % conversion specifications in format are replaced with zero or more elements of values. The effect is similar to using the sprintf() in the C language. For example, >>> lang = "Python" >>> print "%s is awesome!" % lang Python is awesomeYou can also format numbers with this notation. For example, >>> cost = 128.527 >>> print "The book costs $%.2f at the bookstore" % cost The book costs $128.53 at the bookstoreYou can also use dictionaries to interpolate strings. They have ... Read More