docstrings

Author: jbrockmendel

pandas/_libs/parsers.pyx

@@ -2229,6 +2229,16 @@ def _maybe_encode(values):
 
 def sanitize_objects(ndarray[object] values, set na_values,
                      convert_empty=True):
+    """
+    Convert specified values, including the given set na_values and empty
+    strings if convert_empty is True, to np.nan.
+
+    Parameters
+    ----------
+    values : ndarray[object]
+    na_values : set
+    convert_empty : bool (default True)
+    """
     cdef:
         Py_ssize_t i, n
         object val, onan

pandas/_libs/writers.pyx

@@ -29,13 +29,24 @@ ctypedef fused pandas_string:
 @cython.wraparound(False)
 def write_csv_rows(list data, ndarray data_index,
                    int nlevels, ndarray cols, object writer):
-
+    """
+    Write the given data to the writer object, pre-allocating where possible
+    for performance improvements.
+
+    Parameters
+    ----------
+    data : list
+    data_index : ndarray
+    nlevels : int
+    cols : ndarray
+    writer : object
+    """
     cdef int N, j, i, ncols
     cdef list rows
     cdef object val
 
     # In crude testing, N>100 yields little marginal improvement
-    N=100
+    N = 100
 
     # pre-allocate rows
     ncols = len(cols)