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Exercises/ex1_1.md

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+\[ [Index](index.md) | []() | [Exercise 1.2](ex1_2.md) \]
+
+# Exercise 1.1
+
+*Objectives:*
+
+- Make sure Python is installed correctly on your machine
+- Start the interactive interpreter
+- Edit and run a small program
+
+*Files Created:* `art.py`
+
+## (a) Launch Python
+
+Start Python3 on your machine.  Make sure you can type simple
+statements such as the "hello world" program:
+
+```python
+>>> print('Hello World')
+Hello World
+>>>
+```
+
+In much of this course, you'll want to make sure you can work from
+the interactive REPL like this.   If you're working from a different
+environment such as IPython or Jupyter Notebooks, that's fine.
+
+## (b) Some Generative Art
+
+Create the following program and put it in a file called `art.py`:
+
+```python
+# art.py
+
+import sys
+import random
+
+chars = '\|/'
+
+def draw(rows, columns):
+    for r in rows:
+    	print(''.join(random.choice(chars) for _ in range(columns)))
+
+if __name__ == '__main__':
+    if len(sys.argv) != 3:
+        raise SystemExit("Usage: art.py rows columns")
+    draw(int(sys.argv[1]), int(sys.argv[2]))
+```
+
+Make sure you can run this program from the command line or a terminal.
+
+```
+bash % python3 art.py 10 20
+```
+
+If you run the above command, you'll get a crash and traceback message.
+Go fix the problem and run the program again.  You should get output like
+this:
+
+```
+bash % python3 art.py 10 20
+||||/\||//\//\|||\|\
+///||\/||\//|\\|\\/\
+|\////|//|||\//|/\||
+|//\||\/|\///|\|\|/|
+|/|//|/|/|\\/\/\||//
+|\/\|\//\\//\|\||\\/
+|||\\\\/\\\|/||||\/|
+\\||\\\|\||||////\\|
+//\//|/|\\|\//\|||\/
+\\\|/\\|/|\\\|/|/\/|
+bash %
+```
+
+### Important Note
+
+It is absolutely essential that you are able to edit, run, and debug
+ordinary Python programs for the rest of this course.  The choice
+of editor, IDE, or operating system doesn't matter as long as you
+are able to experiment interactively and create normal Python source
+files that can execute from the command line.
+
+
+\[ [Solution](soln1_1.md) | [Index](index.md) | [Exercise 1.2](ex1_2.md) \]
+
+
+
+----
+`>>>` Advanced Python Mastery  
+`...` A course by [dabeaz](https://www.dabeaz.com)  
+`...` Copyright 2007-2023  
+
+![](https://i.creativecommons.org/l/by-sa/4.0/88x31.png). This work is licensed under a [Creative Commons Attribution-ShareAlike 4.0 International License](http://creativecommons.org/licenses/by-sa/4.0/)