From ec30480a7121956b0ccde353180d1656fce866af Mon Sep 17 00:00:00 2001
From: Frederick Muriuki Muriithi
Date: Mon, 11 Apr 2022 14:05:57 +0300
Subject: Implement MVP for valid_value functions

* Implement the minimum viable functions for the average and standard
  error `valid_value` functions.
---
 quality_control/average.py        | 7 ++++++-
 quality_control/standard_error.py | 7 ++++++-
 2 files changed, 12 insertions(+), 2 deletions(-)

(limited to 'quality_control')

diff --git a/quality_control/average.py b/quality_control/average.py
index 6ed0da7..1a7bf5f 100644
--- a/quality_control/average.py
+++ b/quality_control/average.py
@@ -4,4 +4,9 @@ import re
 from .errors import InvalidValue
 
 def valid_value(val):
-    return None
+    if re.search("^[0-9]+\.[0-9]{3}$", val):
+        return float(val)
+    raise InvalidValue(
+        f"Invalid value '{val}'.\n"
+        "Expected string representing a number with exactly three decimal "
+        "places.")
diff --git a/quality_control/standard_error.py b/quality_control/standard_error.py
index 9a91d1b..ae1e378 100644
--- a/quality_control/standard_error.py
+++ b/quality_control/standard_error.py
@@ -4,4 +4,9 @@ import re
 from .errors import InvalidValue
 
 def valid_value(val):
-    return None
+    if re.search("^[0-9]+\.[0-9]{6,}$", val):
+        return float(val)
+    raise InvalidValue(
+        f"Invalid value '{val}'.\n"
+        "Expected string representing a number with at least six decimal "
+        "places.")
-- 
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