![error checking pytho iconsole input error checking pytho iconsole input](https://code-projects.org/wp-content/uploads/2017/11/Screenshot-879-650x450.png)
There are some situations in which runtime errors are likely to occur. We have have tried to prevent runtime errors by checking data which may be incorrect before we used it, but we haven’t yet seen how we can handle errors when they do occur – our programs so far have just crashed suddenly whenever they have encountered one. Until now, the programs that we have written have generally ignored the fact that things can go wrong. You should always try to factor out excessive duplication using functions and loops – we will look at this in more detail later. If you have many duplicate lines with minor differences, it’s very easy to miss a necessary change when you are editing your pasted lines. If you misspell an identifier name, you may get a runtime error or a logical error, depending on whether the misspelled name is defined.Ī common source of variable name mix-ups and incorrect indentation is frequent copying and pasting of large blocks of code.
![error checking pytho iconsole input error checking pytho iconsole input](https://i.stack.imgur.com/R1c6n.png)
making a mistake in a boolean expression.using integer division instead of floating-point division.Here are some examples of mistakes which lead to logical errors: However, more frequently these kinds of errors are caused by programmer carelessness. Sometimes there can be absolutely nothing wrong with your Python implementation of an algorithm – the algorithm itself can be incorrect.
![error checking pytho iconsole input error checking pytho iconsole input](https://i.stack.imgur.com/o4wht.png)
ERROR CHECKING PYTHO ICONSOLE INPUT CODE
You will have to find the problem on your own by reviewing all the relevant parts of your code – although some tools can flag suspicious code which looks like it could cause unexpected behaviour. You won’t get an error message, because no syntax or runtime error has occurred. The error is caused by a mistake in the program’s logic. They occur when the program runs without crashing, but produces an incorrect result. Logical errors are the most difficult to fix. We will look at this in more detail in the chapter about exception handling. You should always try to add checks to your code to make sure that it can deal with bad input and edge cases gracefully. Runtime errors often creep in if you don’t consider all possible values that a variable could contain, especially when you are processing user input.
ERROR CHECKING PYTHO ICONSOLE INPUT FREE
If a program is syntactically correct – that is, free of syntax errors – it will be run by the Python interpreter.