bite 100

Author: [email protected]

100/tail.py

@@ -0,0 +1,20 @@
+def tail(filepath, n):
+    """Similate Unix' tail -n, read in filepath, parse it into a list,
+       strip newlines and return a list of the last n lines"""
+    file_ = str(filepath)
+    for line in file_.split(" "):
+        with open(file_, "r") as tempfile:
+            data = tempfile.read()
+
+    dat = list()
+    for line in data.splitlines():
+        dat.append(line)
+
+    total_line = len(dat)
+    # print(dat)
+    dat = dat[total_line-n:total_line]
+    # print(dat)
+    return dat
+
+
+tail("/home/bora/0WORKYR3/_pybites/bitesofpy/101/driving.py",2)

100/test_tail.py

@@ -0,0 +1,33 @@
+import pytest
+
+from tail import tail
+
+content = b"""Hello world!
+We hope that you are learning a lot of Python.
+Have fun with our Bites of Py.
+Keep calm and code in Python!
+Become a PyBites ninja!"""
+
+
+# https://docs.pytest.org/en/latest/tmpdir.html#the-tmpdir-factory-fixture
+
+@pytest.fixture
+def my_file(tmp_path):
+    f = tmp_path / "some_file.txt"
+    f.write_bytes(content)
+    return f
+
+
+def test_tail_various_args(my_file):
+    assert tail(my_file.resolve(), 1) == ['Become a PyBites ninja!']
+    assert tail(my_file.resolve(), 2) == ['Keep calm and code in Python!',
+                                          'Become a PyBites ninja!']
+
+
+def test_tail_arg_gt_num_lines_files(my_file):
+    # n of > file length basically gets the whole file, but need to do some
+    # byte to str conversion and strip off last line's newline char
+    actual = tail(my_file.resolve(), 10)
+    expected = [line.decode("utf-8")
+                for line in content.splitlines()]
+    assert actual == expected

96/wc.py

@@ -12,7 +12,7 @@ def wc(file_):
     char_counter = 0
     for line in data.splitlines():
         # print(ch)
-        print(line)
+        # print(line)
         line_counter = line_counter+1
         # print(char_counter)
         for word in line.split():