Badges Added

README.md

@@ -1,5 +1,6 @@
 # checkdigit
-Checking digits with a digit!
+![](https://img.shields.io/travis/com/harens/checkdigit.svg?style=for-the-badge) ![https://pypi.org/project/checkdigit/](https://img.shields.io/pypi/v/checkdigit.svg?logoColor=violet&style=for-the-badge) ![https://pypi.org/project/checkdigit/](https://img.shields.io/pypi/format/checkdigit.svg?style=for-the-badge) ![https://pypi.org/project/checkdigit/](https://img.shields.io/pypi/status/checkdigit.svg?style=for-the-badge) ![https://pypi.org/project/checkdigit/](https://img.shields.io/pypi/pyversions/checkdigit.svg?style=for-the-badge)
+__Checking digits with a digit!__
 
 ## Installation
 ```shell
@@ -8,4 +9,4 @@ pip install checkdigit
 Or download the project [here](https://github.com/harens/checkdigit/archive/master.zip)
 
 ## License
-This project is licensed under the [GNU General Public License v3.0](https://github.com/harens/checkdigit/master/LICENSE)
+This project is licensed under the [GNU General Public License v3.0](https://github.com/harens/checkdigit/blob/master/LICENSE)

checkdigit/isbn.py

@@ -56,3 +56,28 @@ def isbn13calculate(data):
 
 def isbn13check(data):
     return isbn13calculate(data[:9]) == data[-1]  # Sees if check digit is valid
+
+
+# p = position of ?
+# total_sum = 10a + 9b + ... j (excluding p?)
+# For ISBN-10: ? = (121 - total_sum - (11 x check digit)) / p
+
+
+def calculate_missing(data):
+    char_pos = 10 - data.index("?")  # What ? is multiplied by
+    total_sum = 0
+    multiply_counter = 10
+    for item in data:
+        if item == "X":
+            total_sum += 10
+        elif item != "?":
+            total_sum += int(item) * multiply_counter
+        multiply_counter -= 1
+    poss_output = 0
+    while True:
+        final_value = ((11 * poss_output) - total_sum) / char_pos
+        if int(final_value) == final_value and final_value >= 0:
+            if final_value == 10:
+                return "X"
+            return str(int(final_value))  # Better to not have .0
+        poss_output += 1

setup.py

@@ -32,23 +32,23 @@
     packages=find_packages(exclude=("tests",)),
     author_email="[email protected]",
     url="https://harens.github.io",
-    download_url='https://github.com/harens/checkdigit/tarball/0.0.1',
+    download_url="https://github.com/harens/checkdigit/tarball/0.0.1",
     classifiers=[
         "Development Status :: 3 - Alpha",
-        'Operating System :: OS Independent',
-        'Intended Audience :: Information Technology',
-        'Intended Audience :: Education',
+        "Operating System :: OS Independent",
+        "Intended Audience :: Information Technology",
+        "Intended Audience :: Education",
         "License :: OSI Approved :: GNU General Public License v3 (GPLv3)",
-        'Programming Language :: Python',
+        "Programming Language :: Python",
         "Programming Language :: Python :: 3",
         "Programming Language :: Python :: 3.4",
         "Programming Language :: Python :: 3.5",
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
     ],
     project_urls={
-        'Source': 'https://github.com/harens/checkdigit',
-        'Tracker': 'https://github.com/harens/checkdigit/issues',
+        "Source": "https://github.com/harens/checkdigit",
+        "Tracker": "https://github.com/harens/checkdigit/issues",
     },
     keywords="Check Digits, Validation, ISBN",
 )

tests/test_isbn.py

@@ -12,16 +12,17 @@
 # along with checkdigit.  If not, see <http://www.gnu.org/licenses/>.
 
 import sys
+import time
 
-sys.path.append('../')  # Go back a directory
+sys.path.append("../")  # Go back a directory
 from checkdigit import isbn
 
 number_success = 0
 number_failed = 0
 total_tests = 0
 
 
-# Test function
+# Test function (Credit to spscah)
 def test(function, value):
     global total_tests
     total_tests += 1
@@ -41,6 +42,8 @@ def test(function, value):
         print("")
 
 
+start_time = time.time()
+
 test(isbn.evenparity("0110"), "01100")
 test(isbn.evenparity("0"), "00")
 test(isbn.evenparity("01101"), "011011")
@@ -53,16 +56,32 @@ def test(function, value):
 
 test(isbn.isbn13calculate("012345678912"), "8")
 
+# For ISBN-10
+test(isbn.calculate_missing("15688?111X"), "1")
+test(isbn.calculate_missing("812071988?"), "3")
+test(isbn.calculate_missing("020161586?"), "X")
+test(isbn.calculate_missing("?131103628"), "0")
+test(isbn.calculate_missing("?86046324X"), "1")
+test(isbn.calculate_missing("1?68811306"), "5")
+test(isbn.calculate_missing("951?451570"), "4")
+test(isbn.calculate_missing("0393020?31"), "2")
+test(isbn.calculate_missing("01367440?5"), "9")
+
+finish_time = time.time()
+final_time = round(finish_time - start_time, 4)
+
 print("")
 if number_failed == 0:
-    print("Out of {0} tests, all succeeded".format(total_tests))
+    print(
+        "Out of {0} tests, all succeeded in {1} seconds".format(total_tests, final_time)
+    )
 elif number_success == 0:
-    print("Out of {0} tests, all failed".format(total_tests))
+    print("Out of {0} tests, all failed in {1} seconds".format(total_tests, final_time))
     exit(1)
 else:
     print(
-        "Out of {0} tests, {1} succeeded and {2} failed".format(
-            total_tests, number_success, number_failed
+        "Out of {0} tests, {1} succeeded and {2} failed in {3} seconds".format(
+            total_tests, number_success, number_failed, final_time
         )
     )
     # Success rate rounded to 2 d.p.