#Python convert string to int code
The point here is that we in Python land want predictable and reliableīehaviour from our code this isn’t PHP with its tendency to justĬonvert things into something similar when convenient (thinking Most of us wantįailure here - it indicates unknown input. Still raise a ValueError for other “non-int” strings. Specific well understood value (the empty string) into 0. Not your turn-any-ValueError-into-0 situation - it is turning a This is veryĬommon (in fact I was looking at exactly such code last night) but is is Which tries to int() a nonempty str and use 0 otherwise. Your first example is this: x = int(user_input) if user_input else 0 It has not to date been accepted, and your post helps illustrate the Try/except” syntax, which is asked for in various forms. What you’re actually pining for is the regularly requested “inline You don’t want 0 from 6.7.1 usually, you want failure) and also Tzu-ping I’m also -1 on this, both for the reason Steven provides (too general, And LBYL on the empty string is trivially easy, not ValueError and replacing it with a default is too greedy to build it Neither of those conditions is true for your suggestion. Had lots of problems with getattr, for example, suppressing errors They aren’t intended to suppress arbitrary errors. Next(iterator, default), unicodedata.name(char, default). The error condition they support is only missing data, not malformedĪnd it is hard, or inefficient, to “Look Before You Leap” and checkįor example, getattr(obj, name, default), dict.get(key, default), The other builtin functions that offer defaults tend to have these two People to handle errors without thought, when they really do need to It too much of an “attractive nuisance”, something that encourages Recommended design, baked into the int and other builtins. Go for it, it’s yourīut I would not want this raised up to an official supported and Some arbitrary default you plucked from thin air. Prefer, including not handling it at all but merely replacing it with That you shouldn’t be permitted to do whatever error handling you Or because I typoed “97w5” when I meant 9735.īut what you do in your code is up to you. I cannot imagine a scenario where I, as the user, would consider itĪcceptable to use 0 because I entered “635.1” when an int was expected, Replacement with a default value is surely going to lead to “Garbage In, (sometimes) a reasonable thing to do, but the empty string is not the We might agree that converting the empty string to some default value is If this is a reasonable suggestion, what about adding a default option to other builtin constructors that can raise a ValueError such as float() or complex()? In the case of CPython, it looks like this could by achieved by adding a single extra if statement around here which if reached and default was set would then return the default. What do people think of adding a keyword argument default= to int() which is used if the input would raise a ValueError? This would allow these examples to then be expressed as x = int(user_input, default=0) and y = int(oup(0), default=1). To handle edge cases in which int(x) raises a ValueError, this usually involves having to write code like: We get the same output as above.įor more on the Python int() function, refer to its documentation.Many times I have found myself writing code to convert strings containing user input, regex matches etc. Here we pass the hex string without the '0x' prefix to the int() function with base as 16. # hex string representing 1024 without '0x' prefix You don’t need to change any arguments as the int() function is capable to handle the hex string irrespective of the presence of the prefix. Let’s now try to convert a hex string without a prefix to int using the int() function. You can see that we get 1024 as the output. We use the int() function to convert the hex string to an integer. Here we have a hex string representing the number 1024 with the prefix '0x'. Let’s convert a hex string with the prefix '0x' to an integer using the int() function. Let’s look at some examples of using the above syntax to convert a hex string to an int. For example, use 16 as the base to convert hex string, use 8 as the base for an octal string, etc.Īlthough, the int() function is capable of inferring the base from the string passed, it’s a good practice to explicitly specify the base. The int() function also takes an optional argument, base to identify the base of the value passed. The following is the syntax – # hex string to int You can use the Python built-in int() function to convert a hexadecimal string to an integer in Python.
#Python convert string to int how to
How to convert hexadecimal string to integer in Python? In this tutorial, we will look at how to convert a hexadecimal number (as a string) to an integer in Python with the help of examples.
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