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--- python:dierbach:chapter_1_python_first_steps [2016/07/28 00:22] – mithat
+++ python:dierbach:chapter_1_python_first_steps [2016/07/28 04:20] – [More about print()] mithat
@@ Line 1: / Line 1: @@
-~~SLIDESHOW flower-mfk~~
+~~SLIDESHOW~~
+~~NOTOC~~
 ====== Python first steps ======
 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 =====
   * Syntax is easy to read.
-  * Interpreted and can be executed interactively.
+  * Interpreted
+  * Can be executed interactively.
   * Huge community.
     * Lots of support.
@@ Line 15: / Line 17: @@
 ===== 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.
   * Many [[https://wiki.python.org/moin/IntegratedDevelopmentEnvironments)|other IDEs]].
@@ Line 53: / Line 55: @@
   * 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]].
 <code python>
@@ Line 97: / Line 99: @@
 ===== 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>
 name = input('What do I call you? ')
@@ Line 157: / Line 159: @@
 num_balloons = int(input('How many balloons? '))
 </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 =====
@@ Line 170: / Line 182: @@
 > 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.
 ===== 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.
+  * 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>
@@ Line 242: / Line 257: @@
 Oops (again).
-===== Code the solution (last time) =====
+===== Code the solution (last time?) =====
 <file python exponent_calculator.py>
@@ Line 263: / Line 278: @@
 </code>
-Success.
+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>
+The code is easier to read and it still works.
 ===== Document the solution =====