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from __future__ import absolute_import, print_function, division
from petl.compat import next
from petl.util.base import Table, asindices
def filldown(table, *fields, **kwargs):
"""
Replace missing values with non-missing values from the row above. E.g.::
>>> import petl as etl
>>> table1 = [['foo', 'bar', 'baz'],
... [1, 'a', None],
... [1, None, .23],
... [1, 'b', None],
... [2, None, None],
... [2, None, .56],
... [2, 'c', None],
... [None, 'c', .72]]
>>> table2 = etl.filldown(table1)
>>> table2.lookall()
+-----+-----+------+
| foo | bar | baz |
+=====+=====+======+
| 1 | 'a' | None |
+-----+-----+------+
| 1 | 'a' | 0.23 |
+-----+-----+------+
| 1 | 'b' | 0.23 |
+-----+-----+------+
| 2 | 'b' | 0.23 |
+-----+-----+------+
| 2 | 'b' | 0.56 |
+-----+-----+------+
| 2 | 'c' | 0.56 |
+-----+-----+------+
| 2 | 'c' | 0.72 |
+-----+-----+------+
>>> table3 = etl.filldown(table1, 'bar')
>>> table3.lookall()
+------+-----+------+
| foo | bar | baz |
+======+=====+======+
| 1 | 'a' | None |
+------+-----+------+
| 1 | 'a' | 0.23 |
+------+-----+------+
| 1 | 'b' | None |
+------+-----+------+
| 2 | 'b' | None |
+------+-----+------+
| 2 | 'b' | 0.56 |
+------+-----+------+
| 2 | 'c' | None |
+------+-----+------+
| None | 'c' | 0.72 |
+------+-----+------+
>>> table4 = etl.filldown(table1, 'bar', 'baz')
>>> table4.lookall()
+------+-----+------+
| foo | bar | baz |
+======+=====+======+
| 1 | 'a' | None |
+------+-----+------+
| 1 | 'a' | 0.23 |
+------+-----+------+
| 1 | 'b' | 0.23 |
+------+-----+------+
| 2 | 'b' | 0.23 |
+------+-----+------+
| 2 | 'b' | 0.56 |
+------+-----+------+
| 2 | 'c' | 0.56 |
+------+-----+------+
| None | 'c' | 0.72 |
+------+-----+------+
Use the `missing` keyword argument to control which value is treated as
missing (`None` by default).
"""
return FillDownView(table, fields, **kwargs)
Table.filldown = filldown
class FillDownView(Table):
def __init__(self, table, fields, missing=None):
self.table = table
self.fields = fields
self.missing = missing
def __iter__(self):
return iterfilldown(self.table, self.fields, self.missing)
def iterfilldown(table, fillfields, missing):
it = iter(table)
try:
hdr = next(it)
except StopIteration:
return
yield tuple(hdr)
if not fillfields: # fill down all fields
fillfields = hdr
fillindices = asindices(hdr, fillfields)
fill = list(next(it)) # fill values
yield tuple(fill)
for row in it:
outrow = list(row)
for idx in fillindices:
if row[idx] == missing:
outrow[idx] = fill[idx] # fill down
else:
fill[idx] = row[idx] # new fill value
yield tuple(outrow)
def fillright(table, missing=None):
"""
Replace missing values with preceding non-missing values. E.g.::
>>> import petl as etl
>>> table1 = [['foo', 'bar', 'baz'],
... [1, 'a', None],
... [1, None, .23],
... [1, 'b', None],
... [2, None, None],
... [2, None, .56],
... [2, 'c', None],
... [None, 'c', .72]]
>>> table2 = etl.fillright(table1)
>>> table2.lookall()
+------+-----+------+
| foo | bar | baz |
+======+=====+======+
| 1 | 'a' | 'a' |
+------+-----+------+
| 1 | 1 | 0.23 |
+------+-----+------+
| 1 | 'b' | 'b' |
+------+-----+------+
| 2 | 2 | 2 |
+------+-----+------+
| 2 | 2 | 0.56 |
+------+-----+------+
| 2 | 'c' | 'c' |
+------+-----+------+
| None | 'c' | 0.72 |
+------+-----+------+
Use the `missing` keyword argument to control which value is treated as
missing (`None` by default).
"""
return FillRightView(table, missing=missing)
Table.fillright = fillright
class FillRightView(Table):
def __init__(self, table, missing=None):
self.table = table
self.missing = missing
def __iter__(self):
return iterfillright(self.table, self.missing)
def iterfillright(table, missing):
it = iter(table)
try:
hdr = next(it)
except StopIteration:
return
yield tuple(hdr)
for row in it:
outrow = list(row)
for i, _ in enumerate(outrow):
if i > 0 and outrow[i] == missing and outrow[i-1] != missing:
outrow[i] = outrow[i-1]
yield tuple(outrow)
def fillleft(table, missing=None):
"""
Replace missing values with following non-missing values. E.g.::
>>> import petl as etl
>>> table1 = [['foo', 'bar', 'baz'],
... [1, 'a', None],
... [1, None, .23],
... [1, 'b', None],
... [2, None, None],
... [2, None, .56],
... [2, 'c', None],
... [None, 'c', .72]]
>>> table2 = etl.fillleft(table1)
>>> table2.lookall()
+-----+------+------+
| foo | bar | baz |
+=====+======+======+
| 1 | 'a' | None |
+-----+------+------+
| 1 | 0.23 | 0.23 |
+-----+------+------+
| 1 | 'b' | None |
+-----+------+------+
| 2 | None | None |
+-----+------+------+
| 2 | 0.56 | 0.56 |
+-----+------+------+
| 2 | 'c' | None |
+-----+------+------+
| 'c' | 'c' | 0.72 |
+-----+------+------+
Use the `missing` keyword argument to control which value is treated as
missing (`None` by default).
"""
return FillLeftView(table, missing=missing)
Table.fillleft = fillleft
class FillLeftView(Table):
def __init__(self, table, missing=None):
self.table = table
self.missing = missing
def __iter__(self):
return iterfillleft(self.table, self.missing)
def iterfillleft(table, missing):
it = iter(table)
try:
hdr = next(it)
except StopIteration:
return
yield tuple(hdr)
for row in it:
outrow = list(reversed(row))
for i, _ in enumerate(outrow):
if i > 0 and outrow[i] == missing and outrow[i-1] != missing:
outrow[i] = outrow[i-1]
yield tuple(reversed(outrow))
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