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This attribute is set to the last exception value caught in a testThis may be useful if you not only want to check that an exception was raised, but that the exception raises an appropriate value for example, if you wanted to check the error message generated as part of raising an exception
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11 Testing, Debugging, Profiling, and Tuning
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It should be noted that the unittest module contains a large number of advanced customization options for grouping tests, creating test suites, and controlling the environment in which tests runThese features are not directly related to the process of writing tests for your code (you tend to write testing classes as shown independently of how tests actually get executed) Consult the documentation at http://docspythonorg/ library/unittesthtml for more information on how to organize tests for larger programs
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The Python Debugger and the pdb Module
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Python includes a simple command-based debugger which is found in the pdb module The pdb module supports post-mortem debugging, inspection of stack frames, breakpoints, single-stepping of source lines, and code evaluation There are several functions for invoking the debugger from a program or from the interactive Python shell
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run(statement [, globals [, locals]])
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Executes the string statement under debugger controlThe debugger prompt will appear immediately before any code executesTyping 'continue' will force it to run globals and locals define the global and local namespaces, respectively, in which the code runs
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runeval(expression [, globals [, locals]])
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Evaluates the expression string under debugger controlThe debugger prompt will appear before any code executes, so you will need to type 'continue' to force it to execute as with run() On success, the value of the expression is returned
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runcall(function [, argument, ])
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Calls a function within the debugger function is a callable object Additional arguments are supplied as the arguments to functionThe debugger prompt will appear before any code executesThe return value of the function is returned upon completion
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set_trace()
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Starts the debugger at the point at which this function is calledThis can be used to hard-code a debugger breakpoint into a specific code location
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post_mortem(traceback)
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Starts post-mortem debugging of a traceback object traceback is typically obtained using a function such as sysexc_info()
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pm()
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Enters post-mortem debugging using the traceback of the last exception Of all of the functions for launching the debugger, the set_trace() function may be the easiest to use in practice If you are working on a complicated application but you have detected a problem in one part of it, you can insert a set_trace() call into the code and simply run the applicationWhen encountered, this will suspend the program and go directly to the debugger where you can inspect the execution environment Execution resumes after you leave the debugger
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The Python Debugger and the pdb Module
Debugger Commands
When the debugger starts, it presents a (Pdb) prompt such as the following:
>>> import pdb >>> import buggymodule >>> pdbrun('buggymodulestart()') > <string>(0) () (Pdb)
(Pdb) is the debugger prompt at which the following commands are recognized Note
that some commands have a short and a long form In this case, parentheses are used to indicate both forms For example, h(elp) means that either h or help is acceptable
[!]statement
Executes the (one-line) statement in the context of the current stack frameThe exclamation point may be omitted, but it must be used to avoid ambiguity if the first word of the statement resembles a debugger commandTo set a global variable, you can prefix the assignment command with a global command on the same line:
(Pdb) global list_options; list_options = ['-l'] (Pdb) a(rgs)
Prints the argument list of the current function
alias [name [command]]
Creates an alias called name that executes commandWithin the command string, the substrings '%1','%2', and so forth are replaced by parameters when the alias is typed '%*' is replaced by all parameters If no command is given, the current alias list is shown Aliases can be nested and can contain anything that can be legally typed at the Pdb prompt Here s an example:
# Print instance variables (usage "pi classInst") alias pi for k in %1_ _dict_ _keys(): print "%1",k,"=",%1_ _dict_ _[k] # Print instance variables in self alias ps pi self b(reak) [loc [, condition]]
Sets a breakpoint at location loc loc either specifies a specific filename and line number or is the name of a function within a moduleThe following syntax is used: