Add conditions lesson

py101/conditions/README.es.rst

@@ -1,14 +1,60 @@
-Boilerplate
------------
+Toma de decisiones
+------------------
 
-Insertar alguna introducción aquí.
+En programación, la toma de decisiones es la anticipación a las condiciones que pueden ocurrir durante la ejecución del programa, así como la espcecificación de las acciones tomadas de acuerdo a las condiciones. El programa determina que acción tomar y que sentencias ejecutar dependiendo del valor de las expresiones. El siguiente es un ejemplo de toma de decisiones encontrado en la mayoría de los lenguajes de programación:
 
 .. sourcecode:: python
 
- print('Some python code here')
+ edad = 45
+
+ if edad > 18:
+ print('Eres muy viejo')
+
+Python provee las sentencias "if", que consisten de una expressión booleana (True o False) seguida de uno o más sentencias, como la mostrada arriba. Las sentencias if pueden ser sucedidas por sentencias "else" que son ejecutadas si la condición del "if" no se cumple.
+
+.. sourcecode:: python
+
+ x = 32
+ y = 2
+
+ if y == 0:
+ print('El divisor no debe ser 0')
+ else:
+ print('El resultado es{0}'.format(x/y))
+
+Las sentencias if pueden ser anidadas, permitiendo ejecutar código más complejo.
+
+.. sourcecode:: python
+
+ age = 23
+ if age < 18:
+ if age < 0:
+ print('Age no es válido')
+ print('Eres muy pequeño para manejar')
+ else:
+ print('Puedes manejar')
+
 
 
 Desafío
 -------
 
-Describir el desafío aquí.
+Usando el siguiente programa, modifica las variables para que el programa imprima las líneas "1", "2" y "3".
+
+.. sourcecode:: python
+
+ # change this code
+ first_number = 0
+ second_number = 0
+
+ # don't change this code
+ if first_number > 15:
+ print("1")
+ if second_number > 15:
+ print("2")
+
+ if first_number < second_number:
+ print("3")
+ else:
+ print("Error")
+

py101/conditions/README.rst

@@ -1,14 +1,60 @@
-Boilerplate
------------
+Decision making
+---------------
 
-Insert some introduction here.
+Decision making is anticipation of conditions occurring while execution of the program and specifying actions taken according to the conditions. Decision structures evaluate multiple expressions which produce True or False. The program determine which action to take and which statements to execute, depending of the value of the expressions. Following is an example of a typical decision making structure found in most of the programming languages:
 
 .. sourcecode:: python
 
- print('Some python code here')
+ age = 45
+
+ if age > 18:
+ print('You are too old')
+
+Python provides the "if" statements, consisting of a boolean expression followed by one or more statementsIf statements can be followed by an else "else" statements executed if the top "if" condition doesn't held.
+
+.. sourcecode:: python
+
+ x = 32
+ y = 2
+
+ if y == 0:
+ print('divisor y should not be zero')
+ else:
+ print('Result is {0}'.format(x/y))
+
+If statements can be nested allowing more complex logic to be executed:
+
+.. sourcecode:: python
+
+ age = 23
+ if age < 18:
+ if age < 0:
+ print('Age is invalid')
+ print('You are too young to drive')
+ else:
+ print('You are allowed to drive')
+
 
 
 Challenge
 ---------
 
-Describe the challenge here
+Using the following program, modify the variables so the program prints the lines "1", "2", and "3"
+
+.. sourcecode:: python
+
+ # change this code
+ first_number = 0
+ second_number = 0
+
+ # don't change this code
+ if first_number > 15:
+ print("1")
+ if second_number > 15:
+ print("2")
+
+ if first_number < second_number:
+ print("3")
+ else:
+ print("Error")
+

py101/conditions/SOLUTION.rst

@@ -1,3 +1,16 @@
 .. sourcecode:: python
 
- print('Some solution here')
+# change this code
+first_number = 20
+second_number = 22
+
+# don't change this code
+if first_number > 15:
+ print("1")
+ if second_number > 15:
+ print("2")
+
+if first_number < second_number:
+ print("3")
+else:
+ print("Error")

py101/conditions/__init__.py

@@ -7,18 +7,32 @@
 import io
 import sys
 import unittest
+import ast
 from story.adventures import AdventureVerificationError, BaseAdventure
 from story.translation import gettext as _
 
 
 class TestOutput(unittest.TestCase):
  """Adventure test"""
 
+ inmutable_code_str = """
+if first_number > 15:
+ print("1")
+ if second_number > 15:
+ print("2")
+
+if first_number < second_number:
+ print("3")
+else:
+ print("Error")
+"""
+
  def __init__(self, candidate_code, file_name='<inline>'):
  """Init the test"""
  super(TestOutput, self).__init__()
  self.candidate_code = candidate_code
  self.file_name = file_name
+ self.inmutable_code = ast.parse(self.inmutable_code_str, file_name, 'exec')
 
  def setUp(self):
  self.__old_stdout = sys.stdout
@@ -31,9 +45,19 @@ def tearDown(self):
  def runTest(self):
  """Makes a simple test of the output"""
 
- #code = compile(self.candidate_code, self.file_name, 'exec', optimize=0)
- #exec(code)
- self.fail("Test not implemented")
+ body = ast.parse(self.candidate_code, self.file_name, 'exec')
+
+ # Looks if the code is the same as the provided code.
+ body_dump = ast.dump(body)
+ for node in self.inmutable_code.body:
+ self.assertTrue(body_dump.find(ast.dump(node)) >= 0, "Provided code should not be modified")
+
+ code = compile(self.candidate_code, self.file_name, 'exec')
+ exec(code)
+ self.assertMultiLineEqual('1\n2\n3\n',
+ self.__mockstdout.getvalue(),
+ 'Output is not correct')
+
 
 
 class Adventure(BaseAdventure):

tests/test_story.py

@@ -6,6 +6,7 @@
 import py101.operators
 import py101.formatting
 import py101.strings
+import py101.conditions
 import unittest
 
 
@@ -42,6 +43,24 @@ def __init__(self, test_module, good_solution):
 print(mystring.upper())
 print(mystring.lower())
 print(mystring.split(' '))
+"""
+ ),
+ AdventureData(
+ py101.conditions,
+ """# change this code
+first_number = 20
+second_number = 22
+
+# don't change this code
+if first_number > 15:
+ print("1")
+ if second_number > 15:
+ print("2")
+
+if first_number < second_number:
+ print("3")
+else:
+ print("Error")
 """
  )
 ]