westonpace commented on a change in pull request #79:
URL: https://github.com/apache/arrow-cookbook/pull/79#discussion_r720488071
##########
File path: python/source/data.rst
##########
@@ -137,3 +137,57 @@ function
.. testoutput::
0 .. 198
+
+Searching for values matching a predicate in Arrays
+---------------------------------------------------
+
+If you have to look for values matching a predicate in Arrow arrays
+the :mod:`arrow.compute` module provides a bunch of predicates that
+can be used to find the values you are looking for.
Review comment:
```suggestion
If you have to look for values matching a predicate in Arrow arrays
the :mod:`arrow.compute` module provides several methods that
can be used to find the values you are looking for.
```
"a bunch of" is a little informal. Function might be a better word than
method, I'm not sure. I think we should distinguish between "predicate" (the
condition we want satisfied) and "method/function" (the tool we use to figure
out what satisfies that condition). A method/function can be a predicate but I
think it should return a bool (and not an array of bool) in that case. For
example `lambda x: x > 10` is a predicate but `filter(lambda x: x > 10,
my_list)` is not.
##########
File path: python/source/data.rst
##########
@@ -137,3 +137,57 @@ function
.. testoutput::
0 .. 198
+
+Searching for values matching a predicate in Arrays
+---------------------------------------------------
+
+If you have to look for values matching a predicate in Arrow arrays
+the :mod:`arrow.compute` module provides a bunch of predicates that
+can be used to find the values you are looking for.
+
+For example, given and array with numbers from 0 to 9, if we
+want to look only for those greater than 5 we could use the
+func:`arrow.compute.greater` predicate and get back the elements
Review comment:
```suggestion
func:`arrow.compute.greater` method and get back the elements
```
##########
File path: python/source/data.rst
##########
@@ -137,3 +137,57 @@ function
.. testoutput::
0 .. 198
+
+Searching for values matching a predicate in Arrays
+---------------------------------------------------
+
+If you have to look for values matching a predicate in Arrow arrays
+the :mod:`arrow.compute` module provides a bunch of predicates that
+can be used to find the values you are looking for.
+
+For example, given and array with numbers from 0 to 9, if we
Review comment:
```suggestion
For example, given an array with numbers from 0 to 9, if we
```
##########
File path: python/source/data.rst
##########
@@ -137,3 +137,57 @@ function
.. testoutput::
0 .. 198
+
+Searching for values matching a predicate in Arrays
+---------------------------------------------------
+
+If you have to look for values matching a predicate in Arrow arrays
+the :mod:`arrow.compute` module provides a bunch of predicates that
+can be used to find the values you are looking for.
+
+For example, given and array with numbers from 0 to 9, if we
+want to look only for those greater than 5 we could use the
+func:`arrow.compute.greater` predicate and get back the elements
+that fit our predicate
+
+.. testcode::
+
+ import pyarrow as pa
+ import pyarrow.compute as pc
+
+ arr = pa.array(range(10))
+ gtfive = pc.greater(arr, 5)
+
+ print(gtfive.to_string())
+
+.. testoutput::
+
+ [
+ false,
+ false,
+ false,
+ false,
+ false,
+ false,
+ true,
+ true,
+ true,
+ true
+ ]
+
+Further more we can filter the array to get only the entries
Review comment:
```suggestion
Furthermore we can filter the array to get only the entries
```
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