Python language string function str and repr python tutorial. First function computes official representation of the object, while second returns informal representation of the object. Why every class needs a repr by dan bader get free updates of new posts here. The str method returns a string, which is considered an informal or nicely printable representation of the given object. The official home of the python programming language. This is mostly a surprise because pythons defaults tend to be fairly useful. The returns of repr and str are identical for int x, but theres a difference between the return values for str y one is formal and the other is informal. Understanding repr function in python edureka community. The repr method is really meant to be just for developers, and more for debugging than actual use of the module. Every now and then, when i go back to writing python.
Python tutorials indepth articles and tutorials video courses stepbystep video lessons quizzes check your learning progress learning paths guided study plans for accelerated learning community learn with other pythonistas topics focus on a. Dec 22, 2015 the returns of repr and str are identical for int x, but theres a difference between the return values for str y one is formal and the other is informal. For example, if we suspect a float has a small rounding error, repr will show us while str may not. This demonstrates that youve taken the time to try to help yourself, it saves us from reiterating obvious answers, and most of all it helps you get a more specific and relevant answer. This is mostly a surprise because python s defaults tend to be fairly useful. Tino wildenhain str but dict just uses repr for all its childs to print. The returned value is the same value yielded by conversions reverse quotes. This is the first step towards solving the gpl incompatibility. The user can pass any arbitrary values to appear as arguments or keyword. It returns a string similar to that returned by the builtin function of the same. It includes any characters altogether placed between single or double quotes.
Python repr function with example repr vs str in python. Python repr function with example repr vs str in python dataflair. This is an instance of repr which is used to provide the repr function described below. For example, if you suspect a string has nonprinting characters in it, or a float has a small rounding error, repr will show you. In this tutorial, we will learn about python repr in detail with the help of examples. For instance, these two expressions print out the same. Pep 3140 strcontainer should call stritem, not repr. This method returns the string representation of the object. Satyajit ranjeev is computer programmer who loves to solve problems. There are two functions that can be used to obtain a readable representation of an object. Both str and repr are used to represent strings in python. The same question was asked by one of my colleagues, which got me researching. Python language string function str and repr python.
Note that when you just type str s in the interpreter, its printing out repr str s, because the interpreter displays the repr of any expression you type. For many types, this function makes an attempt to return a string that would yield an object with the same value when passed to eval, otherwise the representation is a string enclosed in angle brackets that contains the name of the type of the object together with additional information often including the. The reprlib module provides a means for producing object representations with limits on the size of the resulting strings. Both str and repr methods in python are used for string representation of a string. A common question that pops up when dealing with python is. It provides a straightforward way to both print out a representation hence the name of a given python object to a console, and also allows in many cases for easy experimentation with that data since the results of repr. We will look into two important python object functions that are very helpful in debugging python code by logging useful information regarding the object. While the return of repr and str are identical for int x, you should notice the difference between the return values for str y. Mar 14, 2012 python repr and str the difference 14 mar 2012 this is usually a question asked in many python interviews. A software developer gives a tutorial on the python language, diving into the difference between two interesting, but deceivingly similar, functions. Though they both seem to serve the same puppose, there is a little difference between them.
This method is called when print or str function is invoked on an object. Pythons repr function can be really handy, especially when trying to debug issues. The builtin functions repr and str respectively call object. This has useful properties when the object is part of a more complex structure. We often need to convert objects into their string representation for nice output. It also returns the string representation of the value whatever passes with the function repr. Python repr and str the difference satyajit ranjeev.
Dont be afraid to use pythons dunder methodstheyre meant to help you. What is the difference between str and repr functions. Talking of builtin functions in python, lets take one more. Jun 15, 2015 a common question that pops up when dealing with python is. May 14, 2018 learn the concept of object representation in python. D but then i decided to just start writing something, and what started as a script that automaticly opens firefox and searches youtube for a video. What is the difference between str and repr functions in. For converting any type of data to string type in python there are multiple methods available in. But, there exists some differences in their representation. Rather, its goal is to return a printable or human readable string. The repr function returns a printable representation of the given object.
Apr 02, 2017 this feature is not available right now. Changing the attributes of this object will affect the size limits used by repr and the python debugger. So basically i want to know the difference between str function and repr function because both the functions produce the same output. In python, strings are one of the basic data types. What is the difference between str and repr functions in python.
Tell us what youve tried and why it didnt meet your needs. This can be verified by calling str and repr on the string. In this python tutorial we will learn str vs repr in python, which means the difference between str and repr. How to easily remember the difference between str and repr functions in python. Alex summarized well but, surprisingly, was too succinct. Its use is recommended over previous versions of 2. It may not be obvious right off the bat, so lets take a look at this indepth. It is string representation of the object and the code needed to reproduce the object.
Grokbase groups python python list november 1999 groups python python list november 1999. The difference between this and reprobject is that strobject does not always attempt to return a string that is acceptable to eval. Otherwise, the representation is a string enclosed in angle brackets that contains the name of the type of the object along with additional information. Called by the repr builtin function and by string conversions. First, let me reiterate the main points in alexs post.
The same source code archive can also be used to build the windows and mac versions, and is the starting point for ports to all other platforms. Multiprocessing multithreading mutable vs immutable and hashable in python neo4j and. I have been learning python on and off for about a year, and recently i was in a place where many beginners finds themselves in, i finished automate the boring stuff, knew the basics, but had no idea where to go next and i still kind of dont. Today, we will talk about python repr, concluding with some examples to drive the point home. When you define a custom class in python and then try to print one of its instances to the console or inspect it in an interpreter session, you get a relatively unsatisfying result. However, it may not always be the best function to use. For most unix systems, you must download and compile the source code. This is used in the python debugger and may be useful in other contexts as well.