Again basic

ipynb/020_basic_statements.ipynb

@@ -921,11 +921,12 @@
 
 %% Cell type:markdown id: tags:
 
 - Extract the list of items (i.e. "wind", "temperature", "pressure"; see `str.split`).
 - Add "Snow level" to the list of items (see `list.append`)
-- Build a new header such that items are capitalized (with `str.join` and `str.capitalize` and iterating on the list)
+- Capitalize all elements of the list (with `str.capitalize` and iterating on the list)
+- Build a new header such that items are capitalized (with `str.join`)
 
 %% Cell type:markdown id: tags:
 
 #### A possible solution:
 
@@ -1092,12 +1093,14 @@
 ### Do it yourself
 
 - Edit a script with Spyder that calculates the average of a set of numbers. For example `numbers = [67, 12, 2, 9, 23, 5]`
 
   * using the functions `sum` and `len`
-  * manually, using the keyword `while`
-  * check that the 2 methods give the same results with `assert result0 == result1`
+  * manually (without `sum`), using the keyword `while`
+  * check that the 2 methods give the same results with 
+  
+  ```assert avg0 == avg1```
   
   
 - Run the script 
 
   * in Spyder,
@@ -1111,20 +1114,20 @@
 %% Cell type:code id: tags:
 
 ``` python
 numbers = [67, 12, 2, 9, 23, 5]
 
-result0 = sum(numbers) / len(numbers)
+avg0 = sum(numbers) / len(numbers)
 
-result1 = 0
+tmp = 0
 i = 0
 while i < len(numbers):
-    result1 += numbers[i]
+    tmp += numbers[i]
     i = i + 1
-result1 /= i
+avg1 = tmp/ len(numbers)
 
-assert result0 == result1
+assert avg0 == avg1
 ```
 
 %% Cell type:markdown id: tags:
 
 ### Loops with the keyword `for`
@@ -1175,11 +1178,11 @@
 
 %% Cell type:markdown id: tags:
 
 ### Do it yourself
 
-- Simplify your script by using a `for` loops.
+- Extend your script with another method (using a `for` loop) to compute the average.
 
 - In IPython, try to understand how the function `enumerate` works. Use it in your script.
 
 
 %% Cell type:markdown id: tags:
@@ -1188,15 +1191,15 @@
 
 %% Cell type:code id: tags:
 
 ``` python
 l = [67, 12, 2, 9, 23, 5]
-result = 0
+avg2 = 0
 for i, e in enumerate(l):
-    result += e
-result /= i + 1
-assert result == sum(l)/len(l)
+    avg2 += e
+avg2 /= i + 1
+assert avg2 == sum(l)/len(l)
 ```
 
 %% Cell type:markdown id: tags:
 
 ### Do it yourself