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python:dierbach:chapter_1_python_first_steps [2016/07/28 00:06] – mithatpython:dierbach:chapter_1_python_first_steps [2016/07/28 04:20] – [More about print()] mithat
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-~~SLIDESHOW yatil-mfk~~+~~SLIDESHOW~~ 
 +~~NOTOC~~ 
  
 ====== Python first steps ====== ====== Python first steps ======
 Mithat Konar\\  Mithat Konar\\ 
-from Dierbach's "Introduction to Computer Science using Python"+based on Dierbach's //[[http://www.wiley.com/WileyCDA/WileyTitle/productCd-EHEP002046.html|Introduction to Computer Science using Python]]//.
  
 ===== The Python language ===== ===== The Python language =====
  
   * Syntax is easy to read.   * Syntax is easy to read.
-  * Interpreted and can be executed interactively.+  * Interpreted 
 +  * Can be executed interactively.
   * Huge community.   * Huge community.
     * Lots of support.     * Lots of support.
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 ===== IDLE ===== ===== IDLE =====
  
-  * IDLE is Python's 'standard' IDE.+  * [[https://docs.python.org/3/library/idle.html|IDLE]] is Python's "standard" IDE.
   * Good for starting to learn Python.   * Good for starting to learn Python.
   * Many [[https://wiki.python.org/moin/IntegratedDevelopmentEnvironments)|other IDEs]].   * Many [[https://wiki.python.org/moin/IntegratedDevelopmentEnvironments)|other IDEs]].
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   * Python's core is limited.   * Python's core is limited.
-  * Add functionality by ''import''ing *modules*.+  * Add functionality by importing modules.
   * Lots of modules in the [[https://docs.python.org/3/library/)|standard library]].   * Lots of modules in the [[https://docs.python.org/3/library/)|standard library]].
 <code python> <code python>
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 ===== Using IDLE to develop a program ===== ===== Using IDLE to develop a program =====
  
-  * Create a new program file with //File > New File// or //Ctrl+N// on Linux and Windows. +  * Create a new program file with //File > New File// or //Ctrl+N// (Linux and Windows). 
-  * Write code:+  * Write some code:
 <code python> <code python>
 name = input('What do I call you? ') name = input('What do I call you? ')
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 num_balloons = int(input('How many balloons? ')) num_balloons = int(input('How many balloons? '))
 </code> </code>
 +
 +===== More about print() =====
 +  * You can print more than one thing with ''print()''.
 +  * Separate each thing with a comma.
 +<code python>
 +>>> num = 99
 +>>> print("There are", num, "balloons.")
 +There are 99 balloons
 +</code>
 +  * Each "thing" will be converted into a string.
  
 ===== A slightly more substantial program ===== ===== A slightly more substantial program =====
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 > I need an exponent calculator. > I need an exponent calculator.
  
-Solution: Write a program that allows the user to enter any integer base and integer exponent, and displays the value of the base raised to that exponent.+  * Solution: Write a program that allows the user to enter any integer base and integer exponent, and displays the value of the base raised to that exponent.
  
-Observations: The user will enter the values from the keyboard. It would be good if the user got feedback when the result is printed. I will use Python because it will be easy to implement the solution with it. 
  
-===== Proposed interaction =====+ 
 +===== Define the problem ===== 
 +  * Observations: 
 +    * The user will enter the values from the keyboard. 
 +    * It would be good if the user got feedback when the result is printed. 
 +    * I will use Python because it will be easy to implement the solution with it. 
 +  * Proposed interaction:
 <code> <code>
 What base? 10 What base? 10
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 <code python> <code python>
-Enter the base: 10 +>>> Enter the base: 10 
-Enter the exponent: 4+>>> Enter the exponent: 4
 Traceback (most recent call last): Traceback (most recent call last):
   File "/home/mithat/exponent_calculator.py", line 7, in <module>   File "/home/mithat/exponent_calculator.py", line 7, in <module>
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 <code python> <code python>
-Enter the base: 10 +>>> Enter the base: 10 
-Enter the exponent: 4+>>> Enter the exponent: 4
 Traceback (most recent call last): Traceback (most recent call last):
   File "/home/mithat/exponent_calculator.py", line 8, in <module>   File "/home/mithat/exponent_calculator.py", line 8, in <module>
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 Oops (again). Oops (again).
  
-===== Code the solution (last time) =====+===== Code the solution (last time?) =====
  
 <file python exponent_calculator.py> <file python exponent_calculator.py>
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 <code python> <code python>
-Enter the base: 10 +>>> Enter the base: 10 
-Enter the exponent: 4 +>>> Enter the exponent: 4 
-10 to the power of 4 is 10000+>>> 10 to the power of 4 is 10000 
 +</code> 
 + 
 +Success. But we can do better... 
 + 
 +===== Code the solution (last time!) ===== 
 + 
 +<file python exponent_calculator.py> 
 +# Exponent Calculator 
 +# Exponent Calculator 
 +# Calculate a base to an exponent's power. 
 +# Mithat Konar 
 + 
 +base = int(input('Enter the base: ')) 
 +exponent = int(input('Enter the exponent: ')) 
 +result = base ** exponent 
 +print(base, 'to the power of', exponent, 'is', result) 
 +</file> 
 + 
 +===== Test the solution ===== 
 +<code python> 
 +>>> Enter the base: 10 
 +>>> Enter the exponent: 4 
 +>>> 10 to the power of 4 is 10000
 </code> </code>
  
-Success.+The code is easier to read and it still works. 
  
 ===== Document the solution ===== ===== Document the solution =====
  
-  * In this case, we began **documenting the program right from the start**:+  * In this case, we began **documenting the program right from the start**.
     * Writing out details of the problem.     * Writing out details of the problem.
     * Writing out the design of the solution.     * Writing out the design of the solution.
python/dierbach/chapter_1_python_first_steps.txt · Last modified: 2016/07/28 04:26 by mithat
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