From 7c7690d137927030e4aea4bb6605b94838960f3a Mon Sep 17 00:00:00 2001
From: brodriguez8774 <brodriguez8774@gmail.com>
Date: Thu, 26 Sep 2019 20:14:48 -0400
Subject: [PATCH] Implement item set importing from JSON
---
documents/references.md | 3 +++
example_item_set_1.json | 22 ++++++++++++++++++++++
example_item_set_2.json | 14 ++++++++++++++
resources/interface.py | 23 ++++++++++++++++++++++-
4 files changed, 61 insertions(+), 1 deletion(-)
create mode 100644 example_item_set_1.json
create mode 100644 example_item_set_2.json
diff --git a/documents/references.md b/documents/references.md
index abdbef9..3dff948 100644
--- a/documents/references.md
+++ b/documents/references.md
@@ -17,6 +17,9 @@ Used to move to the "Script's Directory", regardless of where the script was lau
### Using Heapq as a Max Heap (Default Behavior is Min Heap)
<https://stackoverflow.com/a/48255910>
+### Reading/Parsing JSON File with Python
+<https://linuxconfig.org/how-to-parse-data-from-json-into-python>
+
## Older Relevant References
References linked in previous assignments.
diff --git a/example_item_set_1.json b/example_item_set_1.json
new file mode 100644
index 0000000..15c44b7
--- /dev/null
+++ b/example_item_set_1.json
@@ -0,0 +1,22 @@
+[
+{
+ "benefit": 12,
+ "cost": 4
+},
+{
+ "benefit": 32,
+ "cost": 8
+},
+{
+ "benefit": 40,
+ "cost": 2
+},
+{
+ "benefit": 30,
+ "cost": 6
+},
+{
+ "benefit": 50,
+ "cost": 1
+}
+]
diff --git a/example_item_set_2.json b/example_item_set_2.json
new file mode 100644
index 0000000..da6bad2
--- /dev/null
+++ b/example_item_set_2.json
@@ -0,0 +1,14 @@
+[
+{
+ "benefit": 35,
+ "cost": 3
+},
+{
+ "benefit": 20,
+ "cost": 2
+},
+{
+ "benefit": 20,
+ "cost": 2
+}
+]
diff --git a/resources/interface.py b/resources/interface.py
index 53f8178..6f7040d 100644
--- a/resources/interface.py
+++ b/resources/interface.py
@@ -9,7 +9,7 @@ User interface for program.
"""
# System Imports.
-
+import json
# User Class Imports.
from resources import logging as init_logging
@@ -132,6 +132,7 @@ class UserInterface():
user_input = input()
print('')
+ # Attempt to set user's input as weight.
try:
user_input = int(user_input.strip())
self._knapsack_algorithm.set_max_weight(user_input)
@@ -150,6 +151,26 @@ class UserInterface():
"""
Sets "Item Set" value by importing from JSON file.
"""
+ print('Enter a JSON formatted file to import from:')
+
+ # Get user's input.
+ user_input = input()
+ print('')
+
+ # Attempt to set file contents as new item set.
+ with open(user_input, 'r') as file:
+ # Read in file.
+ json_data = json.load(file)
+
+ # Check that JSON data is formatted in way we expect.
+ if self._knapsack_algorithm.validate_item_set(json_data):
+ # Validated successfully. Set as new item set.
+ self._knapsack_algorithm.set_item_set(json_data)
+ print('Successfully set new Item Set from JSON data.')
+ self._knapsack_algorithm.display_item_set()
+ else:
+ # Validation failure.
+ print('Failed to validate file contents for Item Set.')
def add_to_item_Set(self):
"""
--
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