Error messages
Assuming that we issue the sqrt(3)
command to estimate the square root of three, we would get the following error message:
>>>sqrt(3) Traceback (most recent call last): File "<pyshell#17>", line 1, in <module> sqrt(3) NameError: name 'sqrt' is not defined
The last line of the error message tells us that the sqrt()
function is not defined. Later in the chapter, we learn that the sqrt()
function is included in a module called math
and that we have to load (import) the module before we can call the functions contained in it. A module is a package that contains a set of functions around a specific subject.
Can't call a variable without assignment
Assuming that we never assign a value to the abcde
variable, after typing abcde
, we would get the following error message:
>>>abcde Traceback (most recent call last): File "<pyshell#0>", line 1, in <module> abcde NameError: name 'abcde' is not defined >>>
The last line tells...