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Exception Handling in Python
Published in Amartya Mukherjee, Nilanjan Dey, Smart Computing with Open Source Platforms, 2019
Amartya Mukherjee, Nilanjan Dey
Syntax error, often called parser error, is a type of error when parser gets a set of codes that violate the rule of a language [1]. This is the most common type of error in Python. Any mistake in proper syntax generates an error like the one shown in Figure 18.1. Such errors are also highlighted with an arrow so that one can easily detect the point where the error actually occurs. For example, if the colon: used at the end of the while loop is missing, the arrow points to the statement immediately after the whileloop. In case of IDLE Graphical User Interface, the error message is not displayed directly in the console; instead it shows a message dialog box as illustrated in Figure 18.2.
IBM Maniframes
Published in Paul W. Ross, The Handbook of Software for Engineers and Scientists, 2018
As previously mentioned, the fact that an expression is evaluated before being passed to CMS/CP should be kept in mind. It is easy for commands to be passed to the operating system that were not intended to be passed by the programmer. Consider the following example: A = “STUFF” /* variable A is assigned the value “STUFF” */ . . . ERASE TEMP WORKFILE A /* erase the file ‘TEMP WORKFILE A’ */ Because REXX evaluates each line before passing it to the operating system, “STUFF” is substituted for “A.” This happens because “A” has been declared as a REXX variable with a value of “STUFF” earlier in the program. Thus, the command “ERASE TEMP WORKFILE STUFF” is passed to the operating system, and an error message results, since there is no file mode STUFF.
Reliability and fault-finding
Published in Mike Tooley, PC Based Instrumentation and Control, 2013
If the Power On Self Test fails, the normal operating system boot sequence is halted and an error message is displayed. The error message varies according to the BIOS type and reference should be made to the BIOS manufacturer's data in order to determine the appropriate course of action.
NewSQL Database Management System Compiler Errors: Effectiveness and Usefulness
Published in International Journal of Human–Computer Interaction, 2022
Human-computer interaction is a field specifically addressing concerns, such as how a machine should interact with a human, and vice versa. Because of the current state of even NewSQL compiler error messages, we deemed enough to point to old guidelines which are still recognized, rather than discussing more recent error message design trends, such as those presented by Barik (2018) or Traver (2010). At the very least, we recommend that DBMS vendors consider the five guidelines introduced by Shneiderman (1982) 40 years ago when designing compiler error messages. First, error messages should be brief. In the context of programming languages, longer error messages have been shown to lengthen end-user response time (Nienaltowski et al., 2008), even though longer messages arguably provide more information to the end-user. Second, the error messages should be formulated in a positive tone, avoiding strict or negative words, such as error or invalid. Third, the error message should be constructive. If possible, the error message should provide a hint on how to fix the error. If it is not possible to reliably provide an accurate hint, the error message should not provide one at all. Fourth, the error message should be specific regarding both the position of the erroneous part, as well as the suggestion of what is erroneous and how to fix it. A general suggestion of referring to the DBMS manual is not helpful. Fifth, the use of comprehensible language is recommended. For example, we cannot argue for “Msg 321, Level 15, State 1, Server q7410” in Figure 1(b) being comprehensible or helpful for a novice. Finally, Shneiderman (1982) suggests positioning the error code (if any) to the end of the error message. This serves as a reference point to the manual, or as a starting point in search engine utilization, yet does not confuse a novice user at the beginning of the error message.