Changes between Version 69 and Version 70 of ControlSystems/SoftwareTeam/IntroToPython

Timestamp:

Sep 4, 2017, 10:11:02 PM (8 years ago)

Author:

cdelgigante

Comment:

--

ControlSystems/SoftwareTeam/IntroToPython

@@ -88 +88 @@
 if location == 'Poughkeepsie, NY':
 }}}
-
 and run it again.   What happens?   It should print "Go away, we're out eating tacos".  Why?  If I was in Poughkeepsie, I'd be out eating tacos too.  Yummmm, tacos.
 
@@ -119 +118 @@
 print("That's alotta fruit!")
 }}}
-
 It should output:
 
@@ -190 +188 @@
 The solution is [wiki:ProgrammingAnswerPotatoExercise here].   This concludes Lesson 2.
 
-
 = Lesson 3:  Functions =
 So are you tired of just printing stuff yet?   In the last lesson, we introduced you to all sort of ways to make decisions and loop over code to make your program easier to read and shorter too.
@@ -233 +230 @@
 
 }}}
-
 Try running these yourself, making sure the results are as expected.
 
-You can even combine these functions with control structures to do some interesting stuff, and even nest them.  For example, try running this (entering values for x and why when prompted.  Try putting in non-numeric or decimal values too): 
+You can even combine these functions with control structures to do some interesting stuff, and even nest them.  For example, try running this (entering values for x and why when prompted.  Try putting in non-numeric or decimal values too):
 
 {{{
@@ -252 +248 @@
   print("Aw, its only",z)
 }}}
-
 '''But wait, there's more'''...you can create your own functions.  That way, if you come up with cool way to do something you can reuse it and don't have to repeat yourself as much.  For instance:
 
@@ -266 +261 @@
 singHappyBirthday(6,['Milla', 'Emma'])  # now use it.
 }}}
-
 Run this one.  What does it output?  A lovely happy birthday song for two kids?   Now imagine if you had to write a program to print out a happy birthday for every single person in your grade without it.  It'd get pretty ugly, fast.
 
-The keyword `def` is used in Python to indicate a custom function, and you have to ''def''ine it in your program before you use it.  This function takes an argument of an age, and second argument of a list of names.  The "singHappyBirthday" line at the end actually ''calls'' or runs the custom function, with the two arguments it needs. 
+The keyword `def` is used in Python to indicate a custom function, and you have to ''def''ine it in your program before you use it.  This function takes an argument of an age, and second argument of a list of names.  The "singHappyBirthday" line at the end actually ''calls'' or runs the custom function, with the two arguments it needs.
 
 A function can return a value too, by using the Python keyword `return` for example:
@@ -284 +278 @@
 print(isGokuPowerfulEnough)
 }}}
-
 Now your turn...  Modify the 'That's-a big number" exercise above, adding a custom function called called inputNumber to input one number, and use it instead of repeating the while-not stuff.  Run it and verify the output is the same.  Much easier to read, no?
 
+By using functions, you can perform powerful operations that are built in the to the language, or someone created.   These function in turn can use other functions and build on top of them to make more advanced programming commands. This concludes lesson 3.
+
 Here's the [[ThatsaBigNumberSolution|solution]]
 
-
-----
+== Lesson 4: Libraries ==
+Now that you seen the basics of the Python language, and have created your own functions.  Its time to see what else is out there.   It turns out there are A LOT of libraries out there for python that do pretty much everything you want, from advance machine intelligence, to 3D graphics, to yes controlling robots.  These libraries were created by others and are offered for free, and others may be offered at a cost.
+
+You can find these libraries by googling for with the term "<subject> python library".  For example "spell check python library".  This turns up [https://pythonhosted.org/pyenchant/ PyEnchant] which describes how to use and access the library.  There are probably others.
+
+To use it in code, you use the !`import` keyword in Python like so:  
+
+{{
+
+#!python
+
+import enchant
+
+d=enchant.Dict("en_US")  # Selects the US english dictionary
+
+bad=check("Helo")
+
+good=check("Hello")
+
+}}
+
+It would be a enormous effort to create your own spell check library, so this saves a lot of time.   We'll be using this when we program robots because a lot of work has already been done.
+
 [[[wiki:ProgrammingReserve Programming]Archive | Programming Archive]]