The documentation states that the default value of Dialect.delimiter is ','. However, when I try to print, it returns None.
>>> print(csv.Dialect.delimiter)
None
Dialect.delimiter A one-character string used to separate fields. It defaults to ','.
This is default value when you creating your own dialect.
import csv
csv.register_dialect('my_dialect')
dialect = csv.get_dialect('my_dialect')
print(dialect.delimiter)
Dialect class. In this case, however, I have to set every formatting arguments. Clearly, this is a conflict,register_dialect() function.
dialect argument.That's the default value when you create a new Dialect. You can get a dialect instance (an inmutable one if you're using Python 3.x) with csv.get_dialect() and register your own using csv.register_dialect. You can also just subclass Dialect and get on with it.
The documentation may seem unclear if you just read that line, but a few lines above you can see that:
To make it easier to specify the format of input and output records, specific formatting parameters are grouped together into dialects. A dialect is a subclass of the Dialect class having a set of specific methods and a single validate() method.
Doing a simple help(csv.Dialect) in the REPL confirms that subclassing is a must when working with this class.
class Dialect(builtins.object)
| Describe a CSV dialect.
|
| This must be subclassed (see csv.excel). Valid attributes are:
| delimiter, quotechar, escapechar, doublequote, skipinitialspace,
| lineterminator, quoting.
|
| Methods defined here:
|
| __init__(self)
| Initialize self. See help(type(self)) for accurate signature.
|
| ----------------------------------------------------------------------
| Data descriptors defined here:
|
| __dict__
| dictionary for instance variables (if defined)
|
| __weakref__
| list of weak references to the object (if defined)
|
| ----------------------------------------------------------------------
| Data and other attributes defined here:
|
| delimiter = None
|
| doublequote = None
|
| escapechar = None
|
| lineterminator = None
|
| quotechar = None
|
| quoting = None
|
| skipinitialspace = None
