first

app/check.py

@@ -0,0 +1,3 @@
+
+def check(binary_string):
+    return int(binary_string, 2)

app/config.py

@@ -0,0 +1 @@
+BEGIN_ANSWERS_TOKEN = "*BEGIN ANSWERS*"

app/generate.py

@@ -0,0 +1,15 @@
+import random
+
+from app.check import check
+
+
+def generate(bits=8):
+    return "".join([random.choice("10") for i in range(bits)])
+
+
+def generate_problems(bits, num_problems):
+    return [generate(bits) for i in range(num_problems)]
+
+
+def generate_answers(problems):
+    return [check(problem) for problem in problems]

app/main.py

@@ -0,0 +1,27 @@
+import sys
+
+from app.generate import generate_answers, generate_problems
+from config import BEGIN_ANSWERS_TOKEN
+
+
+def main():
+    if len(sys.argv) < 3:
+        print(
+            "please supply the number of bits and the number of exercises you'd like, "
+            "space-separated, like so:\n\n    $ binary 8 100\n"
+        )
+        sys.exit()
+
+    bits = int(sys.argv[1])
+    num_problems = int(sys.argv[2])
+
+    problems = generate_problems(bits, num_problems)
+    answers = generate_answers(problems)
+
+    problems_string = "\n\n".join(problems)
+    answers_string = "\n\n".join(
+        [f"{problem} | {answer} " for problem, answer in zip(problems, answers)]
+    )
+
+    sys.stdout.write(BEGIN_ANSWERS_TOKEN.join((problems_string, answers_string)))
+    return problems_string, answers_string

app/test/test_generate.py

@@ -0,0 +1,29 @@
+
+from app.generate import generate, generate_problems
+from app.check import check
+
+
+def test_generate():
+    first_problem = generate(bits=5)
+    assert len(first_problem) == 5
+    assert all(char in ('1', '0') for char in first_problem)
+    assert '1' in first_problem
+    assert '0' in first_problem
+
+
+def test_generate_problems():
+    problems = generate_problems(bits=5, num_problems=100)
+    first_problem = problems[0]
+    assert len(problems) == 100
+    assert len(first_problem) == 5
+    assert all(char in ('1', '0') for char in first_problem)
+    assert '1' in first_problem
+    assert '0' in first_problem
+
+
+def test_check():
+    assert check('110') == 6
+    assert check('000') == 0
+    assert check('001') == 1
+    assert check('011') == 3
+    assert check('010') == 2