Learning Circle : python #7 : Initial Commit

youngjin.han/learning-node02-2020.org

@@ -1,3 +1,42 @@
+* 2020-06-01
+*** Python applying learnings from 1..6
+**** Lecture notes
+     - Previous topics covered:
+       - Printing
+       - Formatting
+       - Variables
+       - Escape Sequences
+       - Inputting text
+       - Reading arguments / using argv
+       - Reading files
+       - Defining methods
+       - Boolean logic
+       - Branching using if/else/elif
+       - Loops: for/while
+     - Today we write a calculator that saves results in a file in python
+       - How it works in general
+         You read the input until you read a line that only contains a
+         "q". Every input line consists of numbers separated by a
+         space. For instance "4 5 9". You will need to .split() the
+         input.
+     - Steps
+       - Create a python script named "calc.py"
+       - It takes 1 command line argument (argv), which is the filename
+         - We will store the calculations *and* results in this file
+       - Create a method named "input_and_calculate_one_line"
+         - It does not have any arguments
+         - It reads one line via *input*
+         - It splits the input (let's say "4 5 9" => [ "4", "5", "9") ])
+         - It calculates the result (f.i. 4+5+9 = 18) and stores it in
+           a variable (use *sum* over the *list*)
+         - It returns a string of the format "4 + 5 + 9 = 18"
+         - If the line only contains a "q" it return "" (an empty string)
+       - Create a method named "editor" that takes a filename as an argument
+         - It opens the file for writing
+         - It uses input_and_calculate_one_line in a while loop
+         - while the return result is not "", we append the string to
+           the file
+         - When the return result is "", the function exits
 * 2020-05-29
 *** Python #6:
 **** DONE Lecture content