Eroman at 08:21, 10 February 2017

2017-02-10T08:21:21Z

@@ Line 4: / Line 4: @@
 * imported files get executed
-* python needs a file name '''init'''.py in the directory ofr the file to import it
+* python needs a file named <code>__init__.py</code> in the directory ofr the file to import it
-* '''init'''.py get executed when something within the directory is imported
+* <code>__init__.py</code> gets executed when something within the directory is imported
 * to not execute on import, put code within a if statement like:
@@ Line 70: / Line 70: @@
 == Dictionary ==
-```python &gt;&gt;&gt; a = [1, 2, 3] &gt;&gt;&gt; a[1] 2 &gt;&gt;&gt; a[0] 1 &gt;&gt;&gt; hello = &quot;hello&quot; &gt;&gt;&gt; hello[1] 'e' &gt;&gt;&gt; [(1, 'h'), (2, 'e')][(1, 'h'), (2, 'e')] &gt;&gt;&gt; a = [(1, 'h'), (2, 'e')] &gt;&gt;&gt; example_dict = {'python': 1991} &gt;&gt;&gt; example_dict {'python': 1991} &gt;&gt;&gt; example_dict['python'] 1991 &gt;&gt;&gt; example_dict['p'] Traceback (most recent call last): File &quot;<input>&quot;, line 1, in <module> example_dict['p'] KeyError: 'p' &gt;&gt;&gt; example_dict.get('python') 1991 &gt;&gt;&gt; example_dict.get('pythons') &gt;&gt;&gt; example_dict.get('pythons', 1990) 1990 &gt;&gt;&gt; example_dict['javascript'] = 1995 &gt;&gt;&gt; example_dict {'javascript': 1995, 'python': 1991} &gt;&gt;&gt;
+<pre>
 &gt;&gt;&gt; a = [1, 2, 3]
-``
+&gt;&gt;&gt; a[1]

Eroman: Created page with "= Lecture 2 = == Importing from files == * imported files get executed * python needs a file name '''init'''.py in the directory ofr the file to import it * '''init'''.py ge..."

2017-02-10T08:18:42Z

Created page with "= Lecture 2 = == Importing from files == * imported files get executed * python needs a file name '''init'''.py in the directory ofr the file to import it * '''init'''.py ge..."

New page

= Lecture 2 =

== Importing from files ==

* imported files get executed
* python needs a file name '''init'''.py in the directory ofr the file to import it
* '''init'''.py get executed when something within the directory is imported
* to not execute on import, put code within a if statement like:

<source lang="python">if __name__ == "__main__":</source>
* For development and debugging, it is very useful to import thing into an interactive python shell

== Unittests ==

<source lang="python">import unittest

HELLO_WORLD = 'hello world'

class HelloTests(unittest.TestCase):
def test_string_correct(self):
self.assertEqual(HELLO_WORLD, 'hello world')

def main():
print(HELLO_WORLD)

if __name__ == "__main__":
main()
</source>
=== Running Unittest ===

<pre>python3 -m unittest helloprinter.py</pre>
== Task 1 ==

Make FizzBuzz testable Make a function that return Fizz if divisible by 3, buzz if divisible by 5, FizzBuzz if divisible by both 3 and 5, and the returns the number if niether is met. And then write tests for these cases

=== Solution ===

<source lang="python">import unittest

def fizz_buzz(i):
if i % 15 == 0:
return 'FizzBuzz'
elif i % 3 == 0:
return 'Fizz'
elif i % 5 == 0:
return 'Buzz'
else:
return i

if __name__ == "__main__":
for i in range(1, 101):
print(fizz_buzz(i))

class FizzBuzzTestCase(unittest.TestCase):
def test_fizz(self):
result = fizz_buzz(3)
self.assertEqual(result, 'Fizz')

def test_buzz(self):
result = fizz_buzz(5)
self.assertEqual(result, 'Buzz')

def test_fizzbuzz(self):
result = fizz_buzz(15)
self.assertEqual(result, 'FizzBuzz')

def test_niether(self):
result = fizz_buzz(1)
self.assertEqual(result, 1)</source>
== Dictionary ==

```python >>> a = [1, 2, 3] >>> a[1] 2 >>> a[0] 1 >>> hello = "hello" >>> hello[1] 'e' >>> [(1, 'h'), (2, 'e')][(1, 'h'), (2, 'e')] >>> a = [(1, 'h'), (2, 'e')] >>> example_dict = {'python': 1991} >>> example_dict {'python': 1991} >>> example_dict['python'] 1991 >>> example_dict['p'] Traceback (most recent call last): File "<input>", line 1, in <module> example_dict['p'] KeyError: 'p' >>> example_dict.get('python') 1991 >>> example_dict.get('pythons') >>> example_dict.get('pythons', 1990) 1990 >>> example_dict['javascript'] = 1995 >>> example_dict {'javascript': 1995, 'python': 1991} >>>

``

I719 Fundamentals of Python/lecture2 - Revision history

Eroman at 08:21, 10 February 2017

Eroman: Created page with "= Lecture 2 = == Importing from files == * imported files get executed * python needs a file name '''init'''.py in the directory ofr the file to import it * '''init'''.py ge..."