bites 78

Author: [email protected]

.gitignore

@@ -43,3 +43,4 @@
 /10/README.md
 /62/README.md
 /86/README.md
+/78/README.md

78/common.py

@@ -0,0 +1,13 @@
+from functools import reduce
+
+
+def common_languages(programmers):
+    """Receive a dict of keys -> names and values -> a sequence of
+       of programming languages, return the common languages"""
+    listoflang = [programmers[dev] for dev in programmers]
+    return reduce(set.intersection, map(set, listoflang))
+
+# print(common_languages(dict(bob=['JS', 'PHP', 'Python', 'Perl', 'Java'],
+#                 tim=['Python', 'Haskell', 'C++', 'JS'],
+#                 sara=['Perl', 'C', 'Java', 'Python', 'JS'],
+#                 paul=['C++', 'JS', 'Python'])))

78/test_common.py

@@ -0,0 +1,39 @@
+import pytest
+
+from common import common_languages
+
+
+@pytest.fixture()
+def programmers():
+    return dict(bob=['JS', 'PHP', 'Python', 'Perl', 'Java'],
+                tim=['Python', 'Haskell', 'C++', 'JS'],
+                sara=['Perl', 'C', 'Java', 'Python', 'JS'],
+                paul=['C++', 'JS', 'Python'])
+
+
+def test_common_languages(programmers):
+    expected = ['JS', 'Python']
+    actual = common_languages(programmers)
+    assert sorted(list(actual)) == expected
+
+
+def test_adding_programmer_without_js(programmers):
+    programmers['sue'] = ['Scala', 'Python']
+    expected = ['Python']
+    actual = common_languages(programmers)
+    assert list(actual) == expected
+
+
+def test_adding_programmer_without_js_nor_python(programmers):
+    programmers['fabio'] = ['PHP']
+    expected = []
+    actual = common_languages(programmers)
+    assert list(actual) == expected
+
+
+def test_common_languages_adding_new_common_language(programmers):
+    programmers['bob'].append('C++')
+    programmers['sara'].append('C++')
+    expected = ['C++', 'JS', 'Python']
+    actual = common_languages(programmers)
+    assert sorted(list(actual)) == expected