feat: csvstat supports the --no-inference, --locale, --blanks, --date…

…-format, --datetime-format options, closes #965

CHANGELOG.rst

@@ -2,6 +2,7 @@ Unreleased
 ----------
 
 * :doc:`/scripts/csvformat` adds a :code:`--skip-header` (:code:`-E`) option to not output a header row.
+* :doc:`/scripts/csvstat` supports the :code:`--no-inference` (:code:`-I`), :code:`--locale` (:code:`-L`), :code:`--blanks`, :code:`--date-format` and :code:`datetime-format` options.
 * :doc:`/scripts/csvstat` adds a :code:`--json` option to output results as JSON text.
 * :doc:`/scripts/csvstat` adds an :code:`--indent` option to indent the JSON text when :code:`--json` is set.
 * :doc:`/scripts/csvstat` reports a "Non-null values" statistic (or a :code:`nonnulls` column when :code:`--csv` is set).

csvkit/utilities/csvstat.py

@@ -69,7 +69,6 @@
 
 class CSVStat(CSVKitUtility):
     description = 'Print descriptive statistics for each column in a CSV file.'
-    override_flags = ['L', 'blanks', 'date-format', 'datetime-format']
 
     def add_arguments(self):
         self.argparser.add_argument(
@@ -144,6 +143,9 @@ def add_arguments(self):
             '-y', '--snifflimit', dest='sniff_limit', type=int, default=1024,
             help='Limit CSV dialect sniffing to the specified number of bytes. '
                  'Specify "0" to disable sniffing entirely, or "-1" to sniff the entire file.')
+        self.argparser.add_argument(
+            '-I', '--no-inference', dest='no_inference', action='store_true',
+            help='Disable type inference when parsing the input. Disable reformatting of values.')
 
     def main(self):
         if self.args.names_only:
@@ -183,6 +185,7 @@ def main(self):
             self.input_file,
             skip_lines=self.args.skip_lines,
             sniff_limit=sniff_limit,
+            column_types=self.get_column_types(),
             **self.reader_kwargs,
         )
 

docs/common_arguments.rst

@@ -31,8 +31,11 @@ csvkit's tools share a set of common command-line arguments. Not every argument
                          Specify the locale (en_US) of any formatted numbers.
    -S, --skipinitialspace
                          Ignore whitespace immediately following the delimiter.
-   --blanks              Do not coerce empty, "na", "n/a", "none", "null", "."
-                         strings to NULL values.
+   --blanks              Do not convert "", "na", "n/a", "none", "null", "." to
+                         NULL.
+   --null-value NULL_VALUES [NULL_VALUES ...]
+                         Convert this value to NULL. --null-value can be
+                         specified multiple times.
    --date-format DATE_FORMAT
                          Specify a strptime date format string like "%m/%d/%Y".
    --datetime-format DATETIME_FORMAT

docs/scripts/csvstat.rst

@@ -10,12 +10,15 @@ Prints descriptive statistics for all columns in a CSV file. Will intelligently
 .. code-block:: bash
 
    usage: csvstat [-h] [-d DELIMITER] [-t] [-q QUOTECHAR] [-u {0,1,2,3}] [-b]
-                  [-p ESCAPECHAR] [-z FIELD_SIZE_LIMIT] [-e ENCODING] [-S] [-H]
-                  [-K SKIP_LINES] [-v] [-l] [--zero] [-V] [--csv] [--json]
+                  [-p ESCAPECHAR] [-z FIELD_SIZE_LIMIT] [-e ENCODING] [-L LOCALE]
+                  [-S] [--blanks] [--null-value NULL_VALUES [NULL_VALUES ...]]
+                  [--date-format DATE_FORMAT] [--datetime-format DATETIME_FORMAT]
+                  [-H] [-K SKIP_LINES] [-v] [-l] [--zero] [-V] [--csv] [--json]
                   [-i INDENT] [-n] [-c COLUMNS] [--type] [--nulls] [--non-nulls]
-                  [--unique] [--min] [--max] [--sum] [--mean] [--median] [--stdev]
-                  [--len] [--freq] [--freq-count FREQ_COUNT] [--count]
-                  [--decimal-format DECIMAL_FORMAT] [-G] [-y SNIFF_LIMIT]
+                  [--unique] [--min] [--max] [--sum] [--mean] [--median]
+                  [--stdev] [--len] [--max-precision] [--freq]
+                  [--freq-count FREQ_COUNT] [--count]
+                  [--decimal-format DECIMAL_FORMAT] [-G] [-y SNIFF_LIMIT] [-I]
                   [FILE]
 
    Print descriptive statistics for each column in a CSV file.
@@ -48,6 +51,7 @@ Prints descriptive statistics for all columns in a CSV file. Will intelligently
      --median              Only output medians.
      --stdev               Only output standard deviations.
      --len                 Only output the length of the longest values.
+     --max-precision       Only output the most decimal places.
      --freq                Only output lists of frequent values.
      --freq-count FREQ_COUNT
                            The maximum number of frequent values to display.
@@ -59,7 +63,10 @@ Prints descriptive statistics for all columns in a CSV file. Will intelligently
                            Do not use grouping separators in decimal numbers.
      -y SNIFF_LIMIT, --snifflimit SNIFF_LIMIT
                            Limit CSV dialect sniffing to the specified number of
-                           bytes. Specify "0" to disable sniffing.
+                           bytes. Specify "0" to disable sniffing entirely, or
+                           "-1" to sniff the entire file.
+     -I, --no-inference    Disable type inference when parsing the input. Disable
+                           reformatting of values.
 
 See also: :doc:`../common_arguments`.